Move mojo edk into mojo/edk

mojo/system/local_data_pipe_unittest.cc

Index: mojo/system/local_data_pipe_unittest.cc
diff --git a/mojo/system/local_data_pipe_unittest.cc b/mojo/system/local_data_pipe_unittest.cc
deleted file mode 100644
index adcd556d2b472dc0141280fa0cdb9c783f239c1b..0000000000000000000000000000000000000000
--- a/mojo/system/local_data_pipe_unittest.cc
+++ /dev/null
@@ -1,2003 +0,0 @@
-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "mojo/system/local_data_pipe.h"
-
-#include <string.h>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "mojo/system/data_pipe.h"
-#include "mojo/system/waiter.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace mojo {
-namespace system {
-namespace {
-
-const uint32_t kSizeOfOptions =
-    static_cast<uint32_t>(sizeof(MojoCreateDataPipeOptions));
-
-// Validate options.
-TEST(LocalDataPipeTest, Creation) {
-  // Create using default options.
-  {
-    // Get default options.
-    MojoCreateDataPipeOptions default_options = {0};
-    EXPECT_EQ(
-        MOJO_RESULT_OK,
-        DataPipe::ValidateCreateOptions(NullUserPointer(), &default_options));
-    scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(default_options));
-    dp->ProducerClose();
-    dp->ConsumerClose();
-  }
-
-  // Create using non-default options.
-  {
-    const MojoCreateDataPipeOptions options = {
-        kSizeOfOptions,                           // |struct_size|.
-        MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE,  // |flags|.
-        1,                                        // |element_num_bytes|.
-        1000                                      // |capacity_num_bytes|.
-    };
-    MojoCreateDataPipeOptions validated_options = {0};
-    EXPECT_EQ(MOJO_RESULT_OK,
-              DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                              &validated_options));
-    scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-    dp->ProducerClose();
-    dp->ConsumerClose();
-  }
-  {
-    const MojoCreateDataPipeOptions options = {
-        kSizeOfOptions,                           // |struct_size|.
-        MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE,  // |flags|.
-        4,                                        // |element_num_bytes|.
-        4000                                      // |capacity_num_bytes|.
-    };
-    MojoCreateDataPipeOptions validated_options = {0};
-    EXPECT_EQ(MOJO_RESULT_OK,
-              DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                              &validated_options));
-    scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-    dp->ProducerClose();
-    dp->ConsumerClose();
-  }
-  {
-    const MojoCreateDataPipeOptions options = {
-        kSizeOfOptions,                                  // |struct_size|.
-        MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_MAY_DISCARD,  // |flags|.
-        7,                                               // |element_num_bytes|.
-        7000000  // |capacity_num_bytes|.
-    };
-    MojoCreateDataPipeOptions validated_options = {0};
-    EXPECT_EQ(MOJO_RESULT_OK,
-              DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                              &validated_options));
-    scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-    dp->ProducerClose();
-    dp->ConsumerClose();
-  }
-  // Default capacity.
-  {
-    const MojoCreateDataPipeOptions options = {
-        kSizeOfOptions,                                  // |struct_size|.
-        MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_MAY_DISCARD,  // |flags|.
-        100,                                             // |element_num_bytes|.
-        0  // |capacity_num_bytes|.
-    };
-    MojoCreateDataPipeOptions validated_options = {0};
-    EXPECT_EQ(MOJO_RESULT_OK,
-              DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                              &validated_options));
-    scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-    dp->ProducerClose();
-    dp->ConsumerClose();
-  }
-}
-
-TEST(LocalDataPipeTest, SimpleReadWrite) {
-  const MojoCreateDataPipeOptions options = {
-      kSizeOfOptions,                           // |struct_size|.
-      MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE,  // |flags|.
-      static_cast<uint32_t>(sizeof(int32_t)),   // |element_num_bytes|.
-      1000 * sizeof(int32_t)                    // |capacity_num_bytes|.
-  };
-  MojoCreateDataPipeOptions validated_options = {0};
-  EXPECT_EQ(MOJO_RESULT_OK,
-            DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                            &validated_options));
-
-  scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-
-  int32_t elements[10] = {0};
-  uint32_t num_bytes = 0;
-
-  // Try reading; nothing there yet.
-  num_bytes = static_cast<uint32_t>(arraysize(elements) * sizeof(elements[0]));
-  EXPECT_EQ(
-      MOJO_RESULT_SHOULD_WAIT,
-      dp->ConsumerReadData(
-          UserPointer<void>(elements), MakeUserPointer(&num_bytes), false));
-
-  // Query; nothing there yet.
-  num_bytes = 0;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(0u, num_bytes);
-
-  // Discard; nothing there yet.
-  num_bytes = static_cast<uint32_t>(5u * sizeof(elements[0]));
-  EXPECT_EQ(MOJO_RESULT_SHOULD_WAIT,
-            dp->ConsumerDiscardData(MakeUserPointer(&num_bytes), false));
-
-  // Read with invalid |num_bytes|.
-  num_bytes = sizeof(elements[0]) + 1;
-  EXPECT_EQ(
-      MOJO_RESULT_INVALID_ARGUMENT,
-      dp->ConsumerReadData(
-          UserPointer<void>(elements), MakeUserPointer(&num_bytes), false));
-
-  // Write two elements.
-  elements[0] = 123;
-  elements[1] = 456;
-  num_bytes = static_cast<uint32_t>(2u * sizeof(elements[0]));
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ProducerWriteData(UserPointer<const void>(elements),
-                                  MakeUserPointer(&num_bytes),
-                                  false));
-  // It should have written everything (even without "all or none").
-  EXPECT_EQ(2u * sizeof(elements[0]), num_bytes);
-
-  // Query.
-  num_bytes = 0;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(2 * sizeof(elements[0]), num_bytes);
-
-  // Read one element.
-  elements[0] = -1;
-  elements[1] = -1;
-  num_bytes = static_cast<uint32_t>(1u * sizeof(elements[0]));
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerReadData(
-          UserPointer<void>(elements), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(1u * sizeof(elements[0]), num_bytes);
-  EXPECT_EQ(123, elements[0]);
-  EXPECT_EQ(-1, elements[1]);
-
-  // Query.
-  num_bytes = 0;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(1 * sizeof(elements[0]), num_bytes);
-
-  // Try to read two elements, with "all or none".
-  elements[0] = -1;
-  elements[1] = -1;
-  num_bytes = static_cast<uint32_t>(2u * sizeof(elements[0]));
-  EXPECT_EQ(
-      MOJO_RESULT_OUT_OF_RANGE,
-      dp->ConsumerReadData(
-          UserPointer<void>(elements), MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(-1, elements[0]);
-  EXPECT_EQ(-1, elements[1]);
-
-  // Try to read two elements, without "all or none".
-  elements[0] = -1;
-  elements[1] = -1;
-  num_bytes = static_cast<uint32_t>(2u * sizeof(elements[0]));
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerReadData(
-          UserPointer<void>(elements), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(456, elements[0]);
-  EXPECT_EQ(-1, elements[1]);
-
-  // Query.
-  num_bytes = 0;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(0u, num_bytes);
-
-  dp->ProducerClose();
-  dp->ConsumerClose();
-}
-
-// Note: The "basic" waiting tests test that the "wait states" are correct in
-// various situations; they don't test that waiters are properly awoken on state
-// changes. (For that, we need to use multiple threads.)
-TEST(LocalDataPipeTest, BasicProducerWaiting) {
-  // Note: We take advantage of the fact that for |LocalDataPipe|, capacities
-  // are strict maximums. This is not guaranteed by the API.
-
-  const MojoCreateDataPipeOptions options = {
-      kSizeOfOptions,                           // |struct_size|.
-      MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE,  // |flags|.
-      static_cast<uint32_t>(sizeof(int32_t)),   // |element_num_bytes|.
-      2 * sizeof(int32_t)                       // |capacity_num_bytes|.
-  };
-  MojoCreateDataPipeOptions validated_options = {0};
-  EXPECT_EQ(MOJO_RESULT_OK,
-            DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                            &validated_options));
-
-  scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-  Waiter waiter;
-  uint32_t context = 0;
-  HandleSignalsState hss;
-
-  // Never readable.
-  waiter.Init();
-  hss = HandleSignalsState();
-  EXPECT_EQ(
-      MOJO_RESULT_FAILED_PRECONDITION,
-      dp->ProducerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 12, &hss));
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfiable_signals);
-
-  // Already writable.
-  waiter.Init();
-  hss = HandleSignalsState();
-  EXPECT_EQ(
-      MOJO_RESULT_ALREADY_EXISTS,
-      dp->ProducerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_WRITABLE, 34, &hss));
-
-  // Write two elements.
-  int32_t elements[2] = {123, 456};
-  uint32_t num_bytes = static_cast<uint32_t>(2u * sizeof(elements[0]));
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ProducerWriteData(UserPointer<const void>(elements),
-                                  MakeUserPointer(&num_bytes),
-                                  true));
-  EXPECT_EQ(static_cast<uint32_t>(2u * sizeof(elements[0])), num_bytes);
-
-  // Adding a waiter should now succeed.
-  waiter.Init();
-  ASSERT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_WRITABLE, 56, nullptr));
-  // And it shouldn't be writable yet.
-  EXPECT_EQ(MOJO_RESULT_DEADLINE_EXCEEDED, waiter.Wait(0, nullptr));
-  hss = HandleSignalsState();
-  dp->ProducerRemoveWaiter(&waiter, &hss);
-  EXPECT_EQ(0u, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfiable_signals);
-
-  // Do it again.
-  waiter.Init();
-  ASSERT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_WRITABLE, 78, nullptr));
-
-  // Read one element.
-  elements[0] = -1;
-  elements[1] = -1;
-  num_bytes = static_cast<uint32_t>(1u * sizeof(elements[0]));
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerReadData(
-          UserPointer<void>(elements), MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(static_cast<uint32_t>(1u * sizeof(elements[0])), num_bytes);
-  EXPECT_EQ(123, elements[0]);
-  EXPECT_EQ(-1, elements[1]);
-
-  // Waiting should now succeed.
-  EXPECT_EQ(MOJO_RESULT_OK, waiter.Wait(1000, &context));
-  EXPECT_EQ(78u, context);
-  hss = HandleSignalsState();
-  dp->ProducerRemoveWaiter(&waiter, &hss);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfiable_signals);
-
-  // Try writing, using a two-phase write.
-  void* buffer = nullptr;
-  num_bytes = static_cast<uint32_t>(3u * sizeof(elements[0]));
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ProducerBeginWriteData(
-                MakeUserPointer(&buffer), MakeUserPointer(&num_bytes), false));
-  EXPECT_TRUE(buffer);
-  EXPECT_EQ(static_cast<uint32_t>(1u * sizeof(elements[0])), num_bytes);
-
-  static_cast<int32_t*>(buffer)[0] = 789;
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ProducerEndWriteData(
-                static_cast<uint32_t>(1u * sizeof(elements[0]))));
-
-  // Add a waiter.
-  waiter.Init();
-  ASSERT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_WRITABLE, 90, nullptr));
-
-  // Read one element, using a two-phase read.
-  const void* read_buffer = nullptr;
-  num_bytes = 0u;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerBeginReadData(
-          MakeUserPointer(&read_buffer), MakeUserPointer(&num_bytes), false));
-  EXPECT_TRUE(read_buffer);
-  // Since we only read one element (after having written three in all), the
-  // two-phase read should only allow us to read one. This checks an
-  // implementation detail!
-  EXPECT_EQ(static_cast<uint32_t>(1u * sizeof(elements[0])), num_bytes);
-  EXPECT_EQ(456, static_cast<const int32_t*>(read_buffer)[0]);
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerEndReadData(static_cast<uint32_t>(1u * sizeof(elements[0]))));
-
-  // Waiting should succeed.
-  EXPECT_EQ(MOJO_RESULT_OK, waiter.Wait(1000, &context));
-  EXPECT_EQ(90u, context);
-  hss = HandleSignalsState();
-  dp->ProducerRemoveWaiter(&waiter, &hss);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfiable_signals);
-
-  // Write one element.
-  elements[0] = 123;
-  num_bytes = static_cast<uint32_t>(1u * sizeof(elements[0]));
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ProducerWriteData(UserPointer<const void>(elements),
-                                  MakeUserPointer(&num_bytes),
-                                  false));
-  EXPECT_EQ(static_cast<uint32_t>(1u * sizeof(elements[0])), num_bytes);
-
-  // Add a waiter.
-  waiter.Init();
-  ASSERT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_WRITABLE, 12, nullptr));
-
-  // Close the consumer.
-  dp->ConsumerClose();
-
-  // It should now be never-writable.
-  EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION, waiter.Wait(1000, &context));
-  EXPECT_EQ(12u, context);
-  hss = HandleSignalsState();
-  dp->ProducerRemoveWaiter(&waiter, &hss);
-  EXPECT_EQ(0u, hss.satisfied_signals);
-  EXPECT_EQ(0u, hss.satisfiable_signals);
-
-  dp->ProducerClose();
-}
-
-TEST(LocalDataPipeTest, BasicConsumerWaiting) {
-  const MojoCreateDataPipeOptions options = {
-      kSizeOfOptions,                           // |struct_size|.
-      MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE,  // |flags|.
-      static_cast<uint32_t>(sizeof(int32_t)),   // |element_num_bytes|.
-      1000 * sizeof(int32_t)                    // |capacity_num_bytes|.
-  };
-  MojoCreateDataPipeOptions validated_options = {0};
-  EXPECT_EQ(MOJO_RESULT_OK,
-            DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                            &validated_options));
-
-  {
-    scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-    Waiter waiter;
-    uint32_t context = 0;
-    HandleSignalsState hss;
-
-    // Never writable.
-    waiter.Init();
-    hss = HandleSignalsState();
-    EXPECT_EQ(
-        MOJO_RESULT_FAILED_PRECONDITION,
-        dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_WRITABLE, 12, &hss));
-    EXPECT_EQ(0u, hss.satisfied_signals);
-    EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-    // Not yet readable.
-    waiter.Init();
-    ASSERT_EQ(MOJO_RESULT_OK,
-              dp->ConsumerAddWaiter(
-                  &waiter, MOJO_HANDLE_SIGNAL_READABLE, 34, nullptr));
-    EXPECT_EQ(MOJO_RESULT_DEADLINE_EXCEEDED, waiter.Wait(0, nullptr));
-    hss = HandleSignalsState();
-    dp->ConsumerRemoveWaiter(&waiter, &hss);
-    EXPECT_EQ(0u, hss.satisfied_signals);
-    EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-    // Write two elements.
-    int32_t elements[2] = {123, 456};
-    uint32_t num_bytes = static_cast<uint32_t>(2u * sizeof(elements[0]));
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ProducerWriteData(UserPointer<const void>(elements),
-                                    MakeUserPointer(&num_bytes),
-                                    true));
-
-    // Should already be readable.
-    waiter.Init();
-    hss = HandleSignalsState();
-    EXPECT_EQ(
-        MOJO_RESULT_ALREADY_EXISTS,
-        dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 56, &hss));
-    EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfied_signals);
-    EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-    // Discard one element.
-    num_bytes = static_cast<uint32_t>(1u * sizeof(elements[0]));
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ConsumerDiscardData(MakeUserPointer(&num_bytes), true));
-    EXPECT_EQ(static_cast<uint32_t>(1u * sizeof(elements[0])), num_bytes);
-
-    // Should still be readable.
-    waiter.Init();
-    hss = HandleSignalsState();
-    EXPECT_EQ(
-        MOJO_RESULT_ALREADY_EXISTS,
-        dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 78, &hss));
-    EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfied_signals);
-    EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-    // Read one element.
-    elements[0] = -1;
-    elements[1] = -1;
-    num_bytes = static_cast<uint32_t>(1u * sizeof(elements[0]));
-    EXPECT_EQ(
-        MOJO_RESULT_OK,
-        dp->ConsumerReadData(
-            UserPointer<void>(elements), MakeUserPointer(&num_bytes), true));
-    EXPECT_EQ(static_cast<uint32_t>(1u * sizeof(elements[0])), num_bytes);
-    EXPECT_EQ(456, elements[0]);
-    EXPECT_EQ(-1, elements[1]);
-
-    // Adding a waiter should now succeed.
-    waiter.Init();
-    ASSERT_EQ(MOJO_RESULT_OK,
-              dp->ConsumerAddWaiter(
-                  &waiter, MOJO_HANDLE_SIGNAL_READABLE, 90, nullptr));
-
-    // Write one element.
-    elements[0] = 789;
-    elements[1] = -1;
-    num_bytes = static_cast<uint32_t>(1u * sizeof(elements[0]));
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ProducerWriteData(UserPointer<const void>(elements),
-                                    MakeUserPointer(&num_bytes),
-                                    true));
-
-    // Waiting should now succeed.
-    EXPECT_EQ(MOJO_RESULT_OK, waiter.Wait(1000, &context));
-    EXPECT_EQ(90u, context);
-    hss = HandleSignalsState();
-    dp->ConsumerRemoveWaiter(&waiter, &hss);
-    EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfied_signals);
-    EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-    // Close the producer.
-    dp->ProducerClose();
-
-    // Should still be readable.
-    waiter.Init();
-    hss = HandleSignalsState();
-    EXPECT_EQ(
-        MOJO_RESULT_ALREADY_EXISTS,
-        dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 12, &hss));
-    EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfied_signals);
-    EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-    // Read one element.
-    elements[0] = -1;
-    elements[1] = -1;
-    num_bytes = static_cast<uint32_t>(1u * sizeof(elements[0]));
-    EXPECT_EQ(
-        MOJO_RESULT_OK,
-        dp->ConsumerReadData(
-            UserPointer<void>(elements), MakeUserPointer(&num_bytes), true));
-    EXPECT_EQ(static_cast<uint32_t>(1u * sizeof(elements[0])), num_bytes);
-    EXPECT_EQ(789, elements[0]);
-    EXPECT_EQ(-1, elements[1]);
-
-    // Should be never-readable.
-    waiter.Init();
-    hss = HandleSignalsState();
-    EXPECT_EQ(
-        MOJO_RESULT_FAILED_PRECONDITION,
-        dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 34, &hss));
-    EXPECT_EQ(0u, hss.satisfied_signals);
-    EXPECT_EQ(0u, hss.satisfiable_signals);
-
-    dp->ConsumerClose();
-  }
-
-  // Test with two-phase APIs and closing the producer with an active consumer
-  // waiter.
-  {
-    scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-    Waiter waiter;
-    uint32_t context = 0;
-    HandleSignalsState hss;
-
-    // Write two elements.
-    int32_t* elements = nullptr;
-    void* buffer = nullptr;
-    // Request room for three (but we'll only write two).
-    uint32_t num_bytes = static_cast<uint32_t>(3u * sizeof(elements[0]));
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ProducerBeginWriteData(
-                  MakeUserPointer(&buffer), MakeUserPointer(&num_bytes), true));
-    EXPECT_TRUE(buffer);
-    EXPECT_GE(num_bytes, static_cast<uint32_t>(3u * sizeof(elements[0])));
-    elements = static_cast<int32_t*>(buffer);
-    elements[0] = 123;
-    elements[1] = 456;
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ProducerEndWriteData(
-                  static_cast<uint32_t>(2u * sizeof(elements[0]))));
-
-    // Should already be readable.
-    waiter.Init();
-    hss = HandleSignalsState();
-    EXPECT_EQ(
-        MOJO_RESULT_ALREADY_EXISTS,
-        dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 12, &hss));
-    EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfied_signals);
-    EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-    // Read one element.
-    // Request two in all-or-none mode, but only read one.
-    const void* read_buffer = nullptr;
-    num_bytes = static_cast<uint32_t>(2u * sizeof(elements[0]));
-    EXPECT_EQ(
-        MOJO_RESULT_OK,
-        dp->ConsumerBeginReadData(
-            MakeUserPointer(&read_buffer), MakeUserPointer(&num_bytes), true));
-    EXPECT_TRUE(read_buffer);
-    EXPECT_EQ(static_cast<uint32_t>(2u * sizeof(elements[0])), num_bytes);
-    const int32_t* read_elements = static_cast<const int32_t*>(read_buffer);
-    EXPECT_EQ(123, read_elements[0]);
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ConsumerEndReadData(
-                  static_cast<uint32_t>(1u * sizeof(elements[0]))));
-
-    // Should still be readable.
-    waiter.Init();
-    hss = HandleSignalsState();
-    EXPECT_EQ(
-        MOJO_RESULT_ALREADY_EXISTS,
-        dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 34, &hss));
-    EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfied_signals);
-    EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-    // Read one element.
-    // Request three, but not in all-or-none mode.
-    read_buffer = nullptr;
-    num_bytes = static_cast<uint32_t>(3u * sizeof(elements[0]));
-    EXPECT_EQ(
-        MOJO_RESULT_OK,
-        dp->ConsumerBeginReadData(
-            MakeUserPointer(&read_buffer), MakeUserPointer(&num_bytes), false));
-    EXPECT_TRUE(read_buffer);
-    EXPECT_EQ(static_cast<uint32_t>(1u * sizeof(elements[0])), num_bytes);
-    read_elements = static_cast<const int32_t*>(read_buffer);
-    EXPECT_EQ(456, read_elements[0]);
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ConsumerEndReadData(
-                  static_cast<uint32_t>(1u * sizeof(elements[0]))));
-
-    // Adding a waiter should now succeed.
-    waiter.Init();
-    ASSERT_EQ(MOJO_RESULT_OK,
-              dp->ConsumerAddWaiter(
-                  &waiter, MOJO_HANDLE_SIGNAL_READABLE, 56, nullptr));
-
-    // Close the producer.
-    dp->ProducerClose();
-
-    // Should be never-readable.
-    EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION, waiter.Wait(1000, &context));
-    EXPECT_EQ(56u, context);
-    hss = HandleSignalsState();
-    dp->ConsumerRemoveWaiter(&waiter, &hss);
-    EXPECT_EQ(0u, hss.satisfied_signals);
-    EXPECT_EQ(0u, hss.satisfiable_signals);
-
-    dp->ConsumerClose();
-  }
-}
-
-// Tests that data pipes aren't writable/readable during two-phase writes/reads.
-TEST(LocalDataPipeTest, BasicTwoPhaseWaiting) {
-  const MojoCreateDataPipeOptions options = {
-      kSizeOfOptions,                           // |struct_size|.
-      MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE,  // |flags|.
-      static_cast<uint32_t>(sizeof(int32_t)),   // |element_num_bytes|.
-      1000 * sizeof(int32_t)                    // |capacity_num_bytes|.
-  };
-  MojoCreateDataPipeOptions validated_options = {0};
-  EXPECT_EQ(MOJO_RESULT_OK,
-            DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                            &validated_options));
-
-  scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-  Waiter waiter;
-  HandleSignalsState hss;
-
-  // It should be writable.
-  waiter.Init();
-  hss = HandleSignalsState();
-  EXPECT_EQ(
-      MOJO_RESULT_ALREADY_EXISTS,
-      dp->ProducerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_WRITABLE, 0, &hss));
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfiable_signals);
-
-  uint32_t num_bytes = static_cast<uint32_t>(1u * sizeof(int32_t));
-  void* write_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerBeginWriteData(
-          MakeUserPointer(&write_ptr), MakeUserPointer(&num_bytes), false));
-  EXPECT_TRUE(write_ptr);
-  EXPECT_GE(num_bytes, static_cast<uint32_t>(1u * sizeof(int32_t)));
-
-  // At this point, it shouldn't be writable.
-  waiter.Init();
-  ASSERT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_WRITABLE, 1, nullptr));
-  EXPECT_EQ(MOJO_RESULT_DEADLINE_EXCEEDED, waiter.Wait(0, nullptr));
-  hss = HandleSignalsState();
-  dp->ProducerRemoveWaiter(&waiter, &hss);
-  EXPECT_EQ(0u, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfiable_signals);
-
-  // It shouldn't be readable yet either.
-  waiter.Init();
-  ASSERT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 2, nullptr));
-  EXPECT_EQ(MOJO_RESULT_DEADLINE_EXCEEDED, waiter.Wait(0, nullptr));
-  hss = HandleSignalsState();
-  dp->ConsumerRemoveWaiter(&waiter, &hss);
-  EXPECT_EQ(0u, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-  static_cast<int32_t*>(write_ptr)[0] = 123;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerEndWriteData(static_cast<uint32_t>(1u * sizeof(int32_t))));
-
-  // It should be writable again.
-  waiter.Init();
-  hss = HandleSignalsState();
-  EXPECT_EQ(
-      MOJO_RESULT_ALREADY_EXISTS,
-      dp->ProducerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_WRITABLE, 3, &hss));
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfiable_signals);
-
-  // And readable.
-  waiter.Init();
-  hss = HandleSignalsState();
-  EXPECT_EQ(
-      MOJO_RESULT_ALREADY_EXISTS,
-      dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 4, &hss));
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-  // Start another two-phase write and check that it's readable even in the
-  // middle of it.
-  num_bytes = static_cast<uint32_t>(1u * sizeof(int32_t));
-  write_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerBeginWriteData(
-          MakeUserPointer(&write_ptr), MakeUserPointer(&num_bytes), false));
-  EXPECT_TRUE(write_ptr);
-  EXPECT_GE(num_bytes, static_cast<uint32_t>(1u * sizeof(int32_t)));
-
-  // It should be readable.
-  waiter.Init();
-  hss = HandleSignalsState();
-  EXPECT_EQ(
-      MOJO_RESULT_ALREADY_EXISTS,
-      dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 5, &hss));
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-  // End the two-phase write without writing anything.
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ProducerEndWriteData(0u));
-
-  // Start a two-phase read.
-  num_bytes = static_cast<uint32_t>(1u * sizeof(int32_t));
-  const void* read_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerBeginReadData(
-          MakeUserPointer(&read_ptr), MakeUserPointer(&num_bytes), false));
-  EXPECT_TRUE(read_ptr);
-  EXPECT_EQ(static_cast<uint32_t>(1u * sizeof(int32_t)), num_bytes);
-
-  // At this point, it should still be writable.
-  waiter.Init();
-  hss = HandleSignalsState();
-  EXPECT_EQ(
-      MOJO_RESULT_ALREADY_EXISTS,
-      dp->ProducerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_WRITABLE, 6, &hss));
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfiable_signals);
-
-  // But not readable.
-  waiter.Init();
-  ASSERT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 7, nullptr));
-  EXPECT_EQ(MOJO_RESULT_DEADLINE_EXCEEDED, waiter.Wait(0, nullptr));
-  hss = HandleSignalsState();
-  dp->ConsumerRemoveWaiter(&waiter, &hss);
-  EXPECT_EQ(0u, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-  // End the two-phase read without reading anything.
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerEndReadData(0u));
-
-  // It should be readable again.
-  waiter.Init();
-  hss = HandleSignalsState();
-  EXPECT_EQ(
-      MOJO_RESULT_ALREADY_EXISTS,
-      dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 8, &hss));
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-  dp->ProducerClose();
-  dp->ConsumerClose();
-}
-
-// Test that a "may discard" data pipe is writable even when it's full.
-TEST(LocalDataPipeTest, BasicMayDiscardWaiting) {
-  const MojoCreateDataPipeOptions options = {
-      kSizeOfOptions,                                  // |struct_size|.
-      MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_MAY_DISCARD,  // |flags|.
-      static_cast<uint32_t>(sizeof(int32_t)),          // |element_num_bytes|.
-      1 * sizeof(int32_t)                              // |capacity_num_bytes|.
-  };
-  MojoCreateDataPipeOptions validated_options = {0};
-  EXPECT_EQ(MOJO_RESULT_OK,
-            DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                            &validated_options));
-
-  scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-  Waiter waiter;
-  HandleSignalsState hss;
-
-  // Writable.
-  waiter.Init();
-  hss = HandleSignalsState();
-  EXPECT_EQ(
-      MOJO_RESULT_ALREADY_EXISTS,
-      dp->ProducerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_WRITABLE, 0, &hss));
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfiable_signals);
-
-  // Not readable.
-  waiter.Init();
-  ASSERT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 1, nullptr));
-  EXPECT_EQ(MOJO_RESULT_DEADLINE_EXCEEDED, waiter.Wait(0, nullptr));
-  hss = HandleSignalsState();
-  dp->ConsumerRemoveWaiter(&waiter, &hss);
-  EXPECT_EQ(0u, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-  uint32_t num_bytes = static_cast<uint32_t>(sizeof(int32_t));
-  int32_t element = 123;
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ProducerWriteData(UserPointer<const void>(&element),
-                                  MakeUserPointer(&num_bytes),
-                                  false));
-  EXPECT_EQ(static_cast<uint32_t>(sizeof(int32_t)), num_bytes);
-
-  // Still writable (even though it's full).
-  waiter.Init();
-  hss = HandleSignalsState();
-  EXPECT_EQ(
-      MOJO_RESULT_ALREADY_EXISTS,
-      dp->ProducerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_WRITABLE, 2, &hss));
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfiable_signals);
-
-  // Now readable.
-  waiter.Init();
-  hss = HandleSignalsState();
-  EXPECT_EQ(
-      MOJO_RESULT_ALREADY_EXISTS,
-      dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 3, &hss));
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-  // Overwrite that element.
-  num_bytes = static_cast<uint32_t>(sizeof(int32_t));
-  element = 456;
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ProducerWriteData(UserPointer<const void>(&element),
-                                  MakeUserPointer(&num_bytes),
-                                  false));
-  EXPECT_EQ(static_cast<uint32_t>(sizeof(int32_t)), num_bytes);
-
-  // Still writable.
-  waiter.Init();
-  hss = HandleSignalsState();
-  EXPECT_EQ(
-      MOJO_RESULT_ALREADY_EXISTS,
-      dp->ProducerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_WRITABLE, 4, &hss));
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfiable_signals);
-
-  // And still readable.
-  waiter.Init();
-  hss = HandleSignalsState();
-  EXPECT_EQ(
-      MOJO_RESULT_ALREADY_EXISTS,
-      dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 5, &hss));
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-  // Read that element.
-  num_bytes = static_cast<uint32_t>(sizeof(int32_t));
-  element = 0;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerReadData(
-          UserPointer<void>(&element), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(static_cast<uint32_t>(sizeof(int32_t)), num_bytes);
-  EXPECT_EQ(456, element);
-
-  // Still writable.
-  waiter.Init();
-  hss = HandleSignalsState();
-  EXPECT_EQ(
-      MOJO_RESULT_ALREADY_EXISTS,
-      dp->ProducerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_WRITABLE, 6, &hss));
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_WRITABLE, hss.satisfiable_signals);
-
-  // No longer readable.
-  waiter.Init();
-  ASSERT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerAddWaiter(&waiter, MOJO_HANDLE_SIGNAL_READABLE, 7, nullptr));
-  EXPECT_EQ(MOJO_RESULT_DEADLINE_EXCEEDED, waiter.Wait(0, nullptr));
-  hss = HandleSignalsState();
-  dp->ConsumerRemoveWaiter(&waiter, &hss);
-  EXPECT_EQ(0u, hss.satisfied_signals);
-  EXPECT_EQ(MOJO_HANDLE_SIGNAL_READABLE, hss.satisfiable_signals);
-
-  dp->ProducerClose();
-  dp->ConsumerClose();
-}
-
-void Seq(int32_t start, size_t count, int32_t* out) {
-  for (size_t i = 0; i < count; i++)
-    out[i] = start + static_cast<int32_t>(i);
-}
-
-TEST(LocalDataPipeTest, MayDiscard) {
-  const MojoCreateDataPipeOptions options = {
-      kSizeOfOptions,                                  // |struct_size|.
-      MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_MAY_DISCARD,  // |flags|.
-      static_cast<uint32_t>(sizeof(int32_t)),          // |element_num_bytes|.
-      10 * sizeof(int32_t)                             // |capacity_num_bytes|.
-  };
-  MojoCreateDataPipeOptions validated_options = {0};
-  EXPECT_EQ(MOJO_RESULT_OK,
-            DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                            &validated_options));
-
-  scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-
-  int32_t buffer[100] = {0};
-  uint32_t num_bytes = 0;
-
-  num_bytes = 20u * sizeof(int32_t);
-  Seq(0, arraysize(buffer), buffer);
-  // Try writing more than capacity. (This test relies on the implementation
-  // enforcing the capacity strictly.)
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerWriteData(
-          UserPointer<const void>(buffer), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(10u * sizeof(int32_t), num_bytes);
-
-  // Read half of what we wrote.
-  num_bytes = 5u * sizeof(int32_t);
-  memset(buffer, 0xab, sizeof(buffer));
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ConsumerReadData(
-                UserPointer<void>(buffer), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(5u * sizeof(int32_t), num_bytes);
-  int32_t expected_buffer[100];
-  memset(expected_buffer, 0xab, sizeof(expected_buffer));
-  Seq(0, 5u, expected_buffer);
-  EXPECT_EQ(0, memcmp(buffer, expected_buffer, sizeof(buffer)));
-  // Internally, a circular buffer would now look like:
-  //   -, -, -, -, -, 5, 6, 7, 8, 9
-
-  // Write a bit more than the space that's available.
-  num_bytes = 8u * sizeof(int32_t);
-  Seq(100, arraysize(buffer), buffer);
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerWriteData(
-          UserPointer<const void>(buffer), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(8u * sizeof(int32_t), num_bytes);
-  // Internally, a circular buffer would now look like:
-  //   100, 101, 102, 103, 104, 105, 106, 107, 8, 9
-
-  // Read half of what's available.
-  num_bytes = 5u * sizeof(int32_t);
-  memset(buffer, 0xab, sizeof(buffer));
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ConsumerReadData(
-                UserPointer<void>(buffer), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(5u * sizeof(int32_t), num_bytes);
-  memset(expected_buffer, 0xab, sizeof(expected_buffer));
-  expected_buffer[0] = 8;
-  expected_buffer[1] = 9;
-  expected_buffer[2] = 100;
-  expected_buffer[3] = 101;
-  expected_buffer[4] = 102;
-  EXPECT_EQ(0, memcmp(buffer, expected_buffer, sizeof(buffer)));
-  // Internally, a circular buffer would now look like:
-  //   -, -, -, 103, 104, 105, 106, 107, -, -
-
-  // Write one integer.
-  num_bytes = 1u * sizeof(int32_t);
-  Seq(200, arraysize(buffer), buffer);
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerWriteData(
-          UserPointer<const void>(buffer), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(1u * sizeof(int32_t), num_bytes);
-  // Internally, a circular buffer would now look like:
-  //   -, -, -, 103, 104, 105, 106, 107, 200, -
-
-  // Write five more.
-  num_bytes = 5u * sizeof(int32_t);
-  Seq(300, arraysize(buffer), buffer);
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerWriteData(
-          UserPointer<const void>(buffer), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(5u * sizeof(int32_t), num_bytes);
-  // Internally, a circular buffer would now look like:
-  //   301, 302, 303, 304, 104, 105, 106, 107, 200, 300
-
-  // Read it all.
-  num_bytes = sizeof(buffer);
-  memset(buffer, 0xab, sizeof(buffer));
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ConsumerReadData(
-                UserPointer<void>(buffer), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(10u * sizeof(int32_t), num_bytes);
-  memset(expected_buffer, 0xab, sizeof(expected_buffer));
-  expected_buffer[0] = 104;
-  expected_buffer[1] = 105;
-  expected_buffer[2] = 106;
-  expected_buffer[3] = 107;
-  expected_buffer[4] = 200;
-  expected_buffer[5] = 300;
-  expected_buffer[6] = 301;
-  expected_buffer[7] = 302;
-  expected_buffer[8] = 303;
-  expected_buffer[9] = 304;
-  EXPECT_EQ(0, memcmp(buffer, expected_buffer, sizeof(buffer)));
-
-  // Test two-phase writes, including in all-or-none mode.
-  // Note: Again, the following depends on an implementation detail -- namely
-  // that the write pointer will point at the 5th element of the buffer (and the
-  // buffer has exactly the capacity requested).
-
-  num_bytes = 0u;
-  void* write_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerBeginWriteData(
-          MakeUserPointer(&write_ptr), MakeUserPointer(&num_bytes), false));
-  EXPECT_TRUE(write_ptr);
-  EXPECT_EQ(6u * sizeof(int32_t), num_bytes);
-  Seq(400, 6, static_cast<int32_t*>(write_ptr));
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ProducerEndWriteData(6u * sizeof(int32_t)));
-  // Internally, a circular buffer would now look like:
-  //   -, -, -, -, 400, 401, 402, 403, 404, 405
-
-  // |ProducerBeginWriteData()| ignores |*num_bytes| except in "all-or-none"
-  // mode.
-  num_bytes = 6u * sizeof(int32_t);
-  write_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerBeginWriteData(
-          MakeUserPointer(&write_ptr), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(4u * sizeof(int32_t), num_bytes);
-  static_cast<int32_t*>(write_ptr)[0] = 500;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ProducerEndWriteData(1u * sizeof(int32_t)));
-  // Internally, a circular buffer would now look like:
-  //   500, -, -, -, 400, 401, 402, 403, 404, 405
-
-  // Requesting a 10-element buffer in all-or-none mode fails at this point.
-  num_bytes = 10u * sizeof(int32_t);
-  write_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_OUT_OF_RANGE,
-      dp->ProducerBeginWriteData(
-          MakeUserPointer(&write_ptr), MakeUserPointer(&num_bytes), true));
-
-  // But requesting, say, a 5-element (up to 9, really) buffer should be okay.
-  // It will discard two elements.
-  num_bytes = 5u * sizeof(int32_t);
-  write_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerBeginWriteData(
-          MakeUserPointer(&write_ptr), MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(5u * sizeof(int32_t), num_bytes);
-  // Only write 4 elements though.
-  Seq(600, 4, static_cast<int32_t*>(write_ptr));
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ProducerEndWriteData(4u * sizeof(int32_t)));
-  // Internally, a circular buffer would now look like:
-  //   500, 600, 601, 602, 603, -, 402, 403, 404, 405
-
-  // Do this again. Make sure we can get a buffer all the way out to the end of
-  // the internal buffer.
-  num_bytes = 5u * sizeof(int32_t);
-  write_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerBeginWriteData(
-          MakeUserPointer(&write_ptr), MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(5u * sizeof(int32_t), num_bytes);
-  // Only write 3 elements though.
-  Seq(700, 3, static_cast<int32_t*>(write_ptr));
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ProducerEndWriteData(3u * sizeof(int32_t)));
-  // Internally, a circular buffer would now look like:
-  //   500, 600, 601, 602, 603, 700, 701, 702, -, -
-
-  // Read everything.
-  num_bytes = sizeof(buffer);
-  memset(buffer, 0xab, sizeof(buffer));
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ConsumerReadData(
-                UserPointer<void>(buffer), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(8u * sizeof(int32_t), num_bytes);
-  memset(expected_buffer, 0xab, sizeof(expected_buffer));
-  expected_buffer[0] = 500;
-  expected_buffer[1] = 600;
-  expected_buffer[2] = 601;
-  expected_buffer[3] = 602;
-  expected_buffer[4] = 603;
-  expected_buffer[5] = 700;
-  expected_buffer[6] = 701;
-  expected_buffer[7] = 702;
-  EXPECT_EQ(0, memcmp(buffer, expected_buffer, sizeof(buffer)));
-
-  dp->ProducerClose();
-  dp->ConsumerClose();
-}
-
-TEST(LocalDataPipeTest, AllOrNone) {
-  const MojoCreateDataPipeOptions options = {
-      kSizeOfOptions,                           // |struct_size|.
-      MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE,  // |flags|.
-      static_cast<uint32_t>(sizeof(int32_t)),   // |element_num_bytes|.
-      10 * sizeof(int32_t)                      // |capacity_num_bytes|.
-  };
-  MojoCreateDataPipeOptions validated_options = {0};
-  EXPECT_EQ(MOJO_RESULT_OK,
-            DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                            &validated_options));
-
-  scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-
-  // Try writing way too much.
-  uint32_t num_bytes = 20u * sizeof(int32_t);
-  int32_t buffer[100];
-  Seq(0, arraysize(buffer), buffer);
-  EXPECT_EQ(
-      MOJO_RESULT_OUT_OF_RANGE,
-      dp->ProducerWriteData(
-          UserPointer<const void>(buffer), MakeUserPointer(&num_bytes), true));
-
-  // Should still be empty.
-  num_bytes = ~0u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(0u, num_bytes);
-
-  // Write some data.
-  num_bytes = 5u * sizeof(int32_t);
-  Seq(100, arraysize(buffer), buffer);
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerWriteData(
-          UserPointer<const void>(buffer), MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(5u * sizeof(int32_t), num_bytes);
-
-  // Half full.
-  num_bytes = 0u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(5u * sizeof(int32_t), num_bytes);
-
-  // Too much.
-  num_bytes = 6u * sizeof(int32_t);
-  Seq(200, arraysize(buffer), buffer);
-  EXPECT_EQ(
-      MOJO_RESULT_OUT_OF_RANGE,
-      dp->ProducerWriteData(
-          UserPointer<const void>(buffer), MakeUserPointer(&num_bytes), true));
-
-  // Try reading too much.
-  num_bytes = 11u * sizeof(int32_t);
-  memset(buffer, 0xab, sizeof(buffer));
-  EXPECT_EQ(MOJO_RESULT_OUT_OF_RANGE,
-            dp->ConsumerReadData(
-                UserPointer<void>(buffer), MakeUserPointer(&num_bytes), true));
-  int32_t expected_buffer[100];
-  memset(expected_buffer, 0xab, sizeof(expected_buffer));
-  EXPECT_EQ(0, memcmp(buffer, expected_buffer, sizeof(buffer)));
-
-  // Try discarding too much.
-  num_bytes = 11u * sizeof(int32_t);
-  EXPECT_EQ(MOJO_RESULT_OUT_OF_RANGE,
-            dp->ConsumerDiscardData(MakeUserPointer(&num_bytes), true));
-
-  // Just a little.
-  num_bytes = 2u * sizeof(int32_t);
-  Seq(300, arraysize(buffer), buffer);
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerWriteData(
-          UserPointer<const void>(buffer), MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(2u * sizeof(int32_t), num_bytes);
-
-  // Just right.
-  num_bytes = 3u * sizeof(int32_t);
-  Seq(400, arraysize(buffer), buffer);
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerWriteData(
-          UserPointer<const void>(buffer), MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(3u * sizeof(int32_t), num_bytes);
-
-  // Exactly full.
-  num_bytes = 0u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(10u * sizeof(int32_t), num_bytes);
-
-  // Read half.
-  num_bytes = 5u * sizeof(int32_t);
-  memset(buffer, 0xab, sizeof(buffer));
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ConsumerReadData(
-                UserPointer<void>(buffer), MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(5u * sizeof(int32_t), num_bytes);
-  memset(expected_buffer, 0xab, sizeof(expected_buffer));
-  Seq(100, 5, expected_buffer);
-  EXPECT_EQ(0, memcmp(buffer, expected_buffer, sizeof(buffer)));
-
-  // Try reading too much again.
-  num_bytes = 6u * sizeof(int32_t);
-  memset(buffer, 0xab, sizeof(buffer));
-  EXPECT_EQ(MOJO_RESULT_OUT_OF_RANGE,
-            dp->ConsumerReadData(
-                UserPointer<void>(buffer), MakeUserPointer(&num_bytes), true));
-  memset(expected_buffer, 0xab, sizeof(expected_buffer));
-  EXPECT_EQ(0, memcmp(buffer, expected_buffer, sizeof(buffer)));
-
-  // Try discarding too much again.
-  num_bytes = 6u * sizeof(int32_t);
-  EXPECT_EQ(MOJO_RESULT_OUT_OF_RANGE,
-            dp->ConsumerDiscardData(MakeUserPointer(&num_bytes), true));
-
-  // Discard a little.
-  num_bytes = 2u * sizeof(int32_t);
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ConsumerDiscardData(MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(2u * sizeof(int32_t), num_bytes);
-
-  // Three left.
-  num_bytes = 0u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(3u * sizeof(int32_t), num_bytes);
-
-  // Close the producer, then test producer-closed cases.
-  dp->ProducerClose();
-
-  // Try reading too much; "failed precondition" since the producer is closed.
-  num_bytes = 4u * sizeof(int32_t);
-  memset(buffer, 0xab, sizeof(buffer));
-  EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION,
-            dp->ConsumerReadData(
-                UserPointer<void>(buffer), MakeUserPointer(&num_bytes), true));
-  memset(expected_buffer, 0xab, sizeof(expected_buffer));
-  EXPECT_EQ(0, memcmp(buffer, expected_buffer, sizeof(buffer)));
-
-  // Try discarding too much; "failed precondition" again.
-  num_bytes = 4u * sizeof(int32_t);
-  EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION,
-            dp->ConsumerDiscardData(MakeUserPointer(&num_bytes), true));
-
-  // Read a little.
-  num_bytes = 2u * sizeof(int32_t);
-  memset(buffer, 0xab, sizeof(buffer));
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ConsumerReadData(
-                UserPointer<void>(buffer), MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(2u * sizeof(int32_t), num_bytes);
-  memset(expected_buffer, 0xab, sizeof(expected_buffer));
-  Seq(400, 2, expected_buffer);
-  EXPECT_EQ(0, memcmp(buffer, expected_buffer, sizeof(buffer)));
-
-  // Discard the remaining element.
-  num_bytes = 1u * sizeof(int32_t);
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ConsumerDiscardData(MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(1u * sizeof(int32_t), num_bytes);
-
-  // Empty again.
-  num_bytes = ~0u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(0u, num_bytes);
-
-  dp->ConsumerClose();
-}
-
-TEST(LocalDataPipeTest, AllOrNoneMayDiscard) {
-  const MojoCreateDataPipeOptions options = {
-      kSizeOfOptions,                                  // |struct_size|.
-      MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_MAY_DISCARD,  // |flags|.
-      static_cast<uint32_t>(sizeof(int32_t)),          // |element_num_bytes|.
-      10 * sizeof(int32_t)                             // |capacity_num_bytes|.
-  };
-  MojoCreateDataPipeOptions validated_options = {0};
-  EXPECT_EQ(MOJO_RESULT_OK,
-            DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                            &validated_options));
-
-  scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-
-  // Try writing way too much.
-  uint32_t num_bytes = 20u * sizeof(int32_t);
-  int32_t buffer[100];
-  Seq(0, arraysize(buffer), buffer);
-  EXPECT_EQ(
-      MOJO_RESULT_OUT_OF_RANGE,
-      dp->ProducerWriteData(
-          UserPointer<const void>(buffer), MakeUserPointer(&num_bytes), true));
-
-  // Write some stuff.
-  num_bytes = 5u * sizeof(int32_t);
-  Seq(100, arraysize(buffer), buffer);
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerWriteData(
-          UserPointer<const void>(buffer), MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(5u * sizeof(int32_t), num_bytes);
-
-  // Write lots of stuff (discarding all but "104").
-  num_bytes = 9u * sizeof(int32_t);
-  Seq(200, arraysize(buffer), buffer);
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerWriteData(
-          UserPointer<const void>(buffer), MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(9u * sizeof(int32_t), num_bytes);
-
-  // Read one.
-  num_bytes = 1u * sizeof(int32_t);
-  memset(buffer, 0xab, sizeof(buffer));
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ConsumerReadData(
-                UserPointer<void>(buffer), MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(1u * sizeof(int32_t), num_bytes);
-  int32_t expected_buffer[100];
-  memset(expected_buffer, 0xab, sizeof(expected_buffer));
-  expected_buffer[0] = 104;
-  EXPECT_EQ(0, memcmp(buffer, expected_buffer, sizeof(buffer)));
-
-  // Try reading too many.
-  num_bytes = 10u * sizeof(int32_t);
-  memset(buffer, 0xab, sizeof(buffer));
-  EXPECT_EQ(MOJO_RESULT_OUT_OF_RANGE,
-            dp->ConsumerReadData(
-                UserPointer<void>(buffer), MakeUserPointer(&num_bytes), true));
-  memset(expected_buffer, 0xab, sizeof(expected_buffer));
-  EXPECT_EQ(0, memcmp(buffer, expected_buffer, sizeof(buffer)));
-
-  // Try discarding too many.
-  num_bytes = 10u * sizeof(int32_t);
-  EXPECT_EQ(MOJO_RESULT_OUT_OF_RANGE,
-            dp->ConsumerDiscardData(MakeUserPointer(&num_bytes), true));
-
-  // Discard a bunch.
-  num_bytes = 4u * sizeof(int32_t);
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ConsumerDiscardData(MakeUserPointer(&num_bytes), true));
-
-  // Half full.
-  num_bytes = 0u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(5u * sizeof(int32_t), num_bytes);
-
-  // Write as much as possible.
-  num_bytes = 10u * sizeof(int32_t);
-  Seq(300, arraysize(buffer), buffer);
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerWriteData(
-          UserPointer<const void>(buffer), MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(10u * sizeof(int32_t), num_bytes);
-
-  // Read everything.
-  num_bytes = 10u * sizeof(int32_t);
-  memset(buffer, 0xab, sizeof(buffer));
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ConsumerReadData(
-                UserPointer<void>(buffer), MakeUserPointer(&num_bytes), true));
-  memset(expected_buffer, 0xab, sizeof(expected_buffer));
-  EXPECT_EQ(10u * sizeof(int32_t), num_bytes);
-  Seq(300, 10, expected_buffer);
-  EXPECT_EQ(0, memcmp(buffer, expected_buffer, sizeof(buffer)));
-
-  // Note: All-or-none two-phase writes on a "may discard" data pipe are tested
-  // in LocalDataPipeTest.MayDiscard.
-
-  dp->ProducerClose();
-  dp->ConsumerClose();
-}
-
-TEST(LocalDataPipeTest, TwoPhaseAllOrNone) {
-  const MojoCreateDataPipeOptions options = {
-      kSizeOfOptions,                           // |struct_size|.
-      MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE,  // |flags|.
-      static_cast<uint32_t>(sizeof(int32_t)),   // |element_num_bytes|.
-      10 * sizeof(int32_t)                      // |capacity_num_bytes|.
-  };
-  MojoCreateDataPipeOptions validated_options = {0};
-  EXPECT_EQ(MOJO_RESULT_OK,
-            DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                            &validated_options));
-
-  scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-
-  // Try writing way too much (two-phase).
-  uint32_t num_bytes = 20u * sizeof(int32_t);
-  void* write_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_OUT_OF_RANGE,
-      dp->ProducerBeginWriteData(
-          MakeUserPointer(&write_ptr), MakeUserPointer(&num_bytes), true));
-
-  // Try writing an amount which isn't a multiple of the element size
-  // (two-phase).
-  static_assert(sizeof(int32_t) > 1u, "Wow! int32_t's have size 1");
-  num_bytes = 1u;
-  write_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_INVALID_ARGUMENT,
-      dp->ProducerBeginWriteData(
-          MakeUserPointer(&write_ptr), MakeUserPointer(&num_bytes), true));
-
-  // Try reading way too much (two-phase).
-  num_bytes = 20u * sizeof(int32_t);
-  const void* read_ptr = nullptr;
-  EXPECT_EQ(MOJO_RESULT_OUT_OF_RANGE,
-            dp->ConsumerBeginReadData(
-                MakeUserPointer(&read_ptr), MakeUserPointer(&num_bytes), true));
-
-  // Write half (two-phase).
-  num_bytes = 5u * sizeof(int32_t);
-  write_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerBeginWriteData(
-          MakeUserPointer(&write_ptr), MakeUserPointer(&num_bytes), true));
-  // May provide more space than requested.
-  EXPECT_GE(num_bytes, 5u * sizeof(int32_t));
-  EXPECT_TRUE(write_ptr);
-  Seq(0, 5, static_cast<int32_t*>(write_ptr));
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ProducerEndWriteData(5u * sizeof(int32_t)));
-
-  // Try reading an amount which isn't a multiple of the element size
-  // (two-phase).
-  num_bytes = 1u;
-  read_ptr = nullptr;
-  EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT,
-            dp->ConsumerBeginReadData(
-                MakeUserPointer(&read_ptr), MakeUserPointer(&num_bytes), true));
-
-  // Read one (two-phase).
-  num_bytes = 1u * sizeof(int32_t);
-  read_ptr = nullptr;
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ConsumerBeginReadData(
-                MakeUserPointer(&read_ptr), MakeUserPointer(&num_bytes), true));
-  EXPECT_GE(num_bytes, 1u * sizeof(int32_t));
-  EXPECT_EQ(0, static_cast<const int32_t*>(read_ptr)[0]);
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerEndReadData(1u * sizeof(int32_t)));
-
-  // We should have four left, leaving room for six.
-  num_bytes = 0u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(4u * sizeof(int32_t), num_bytes);
-
-  // Assuming a tight circular buffer of the specified capacity, we can't do a
-  // two-phase write of six now.
-  num_bytes = 6u * sizeof(int32_t);
-  write_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_OUT_OF_RANGE,
-      dp->ProducerBeginWriteData(
-          MakeUserPointer(&write_ptr), MakeUserPointer(&num_bytes), true));
-
-  // Write six elements (simple), filling the buffer.
-  num_bytes = 6u * sizeof(int32_t);
-  int32_t buffer[100];
-  Seq(100, 6, buffer);
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerWriteData(
-          UserPointer<const void>(buffer), MakeUserPointer(&num_bytes), true));
-  EXPECT_EQ(6u * sizeof(int32_t), num_bytes);
-
-  // We have ten.
-  num_bytes = 0u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(10u * sizeof(int32_t), num_bytes);
-
-  // But a two-phase read of ten should fail.
-  num_bytes = 10u * sizeof(int32_t);
-  read_ptr = nullptr;
-  EXPECT_EQ(MOJO_RESULT_OUT_OF_RANGE,
-            dp->ConsumerBeginReadData(
-                MakeUserPointer(&read_ptr), MakeUserPointer(&num_bytes), true));
-
-  // Close the producer.
-  dp->ProducerClose();
-
-  // A two-phase read of nine should work.
-  num_bytes = 9u * sizeof(int32_t);
-  read_ptr = nullptr;
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ConsumerBeginReadData(
-                MakeUserPointer(&read_ptr), MakeUserPointer(&num_bytes), true));
-  EXPECT_GE(num_bytes, 9u * sizeof(int32_t));
-  EXPECT_EQ(1, static_cast<const int32_t*>(read_ptr)[0]);
-  EXPECT_EQ(2, static_cast<const int32_t*>(read_ptr)[1]);
-  EXPECT_EQ(3, static_cast<const int32_t*>(read_ptr)[2]);
-  EXPECT_EQ(4, static_cast<const int32_t*>(read_ptr)[3]);
-  EXPECT_EQ(100, static_cast<const int32_t*>(read_ptr)[4]);
-  EXPECT_EQ(101, static_cast<const int32_t*>(read_ptr)[5]);
-  EXPECT_EQ(102, static_cast<const int32_t*>(read_ptr)[6]);
-  EXPECT_EQ(103, static_cast<const int32_t*>(read_ptr)[7]);
-  EXPECT_EQ(104, static_cast<const int32_t*>(read_ptr)[8]);
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerEndReadData(9u * sizeof(int32_t)));
-
-  // A two-phase read of two should fail, with "failed precondition".
-  num_bytes = 2u * sizeof(int32_t);
-  read_ptr = nullptr;
-  EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION,
-            dp->ConsumerBeginReadData(
-                MakeUserPointer(&read_ptr), MakeUserPointer(&num_bytes), true));
-
-  dp->ConsumerClose();
-}
-
-// Tests that |ProducerWriteData()| and |ConsumerReadData()| writes and reads,
-// respectively, as much as possible, even if it has to "wrap around" the
-// internal circular buffer. (Note that the two-phase write and read do not do
-// this.)
-TEST(LocalDataPipeTest, WrapAround) {
-  unsigned char test_data[1000];
-  for (size_t i = 0; i < arraysize(test_data); i++)
-    test_data[i] = static_cast<unsigned char>(i);
-
-  const MojoCreateDataPipeOptions options = {
-      kSizeOfOptions,                           // |struct_size|.
-      MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE,  // |flags|.
-      1u,                                       // |element_num_bytes|.
-      100u                                      // |capacity_num_bytes|.
-  };
-  MojoCreateDataPipeOptions validated_options = {0};
-  EXPECT_EQ(MOJO_RESULT_OK,
-            DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                            &validated_options));
-  // This test won't be valid if |ValidateCreateOptions()| decides to give the
-  // pipe more space.
-  ASSERT_EQ(100u, validated_options.capacity_num_bytes);
-
-  scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-
-  // Write 20 bytes.
-  uint32_t num_bytes = 20u;
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ProducerWriteData(UserPointer<const void>(&test_data[0]),
-                                  MakeUserPointer(&num_bytes),
-                                  false));
-  EXPECT_EQ(20u, num_bytes);
-
-  // Read 10 bytes.
-  unsigned char read_buffer[1000] = {0};
-  num_bytes = 10u;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerReadData(
-          UserPointer<void>(read_buffer), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(10u, num_bytes);
-  EXPECT_EQ(0, memcmp(read_buffer, &test_data[0], 10u));
-
-  // Check that a two-phase write can now only write (at most) 80 bytes. (This
-  // checks an implementation detail; this behavior is not guaranteed, but we
-  // need it for this test.)
-  void* write_buffer_ptr = nullptr;
-  num_bytes = 0u;
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ProducerBeginWriteData(MakeUserPointer(&write_buffer_ptr),
-                                       MakeUserPointer(&num_bytes),
-                                       false));
-  EXPECT_TRUE(write_buffer_ptr);
-  EXPECT_EQ(80u, num_bytes);
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ProducerEndWriteData(0u));
-
-  // Write as much data as we can (using |ProducerWriteData()|). We should write
-  // 90 bytes.
-  num_bytes = 200u;
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ProducerWriteData(UserPointer<const void>(&test_data[20]),
-                                  MakeUserPointer(&num_bytes),
-                                  false));
-  EXPECT_EQ(90u, num_bytes);
-
-  // Check that a two-phase read can now only read (at most) 90 bytes. (This
-  // checks an implementation detail; this behavior is not guaranteed, but we
-  // need it for this test.)
-  const void* read_buffer_ptr = nullptr;
-  num_bytes = 0u;
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ConsumerBeginReadData(MakeUserPointer(&read_buffer_ptr),
-                                      MakeUserPointer(&num_bytes),
-                                      false));
-  EXPECT_TRUE(read_buffer_ptr);
-  EXPECT_EQ(90u, num_bytes);
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerEndReadData(0u));
-
-  // Read as much as possible (using |ConsumerReadData()|). We should read 100
-  // bytes.
-  num_bytes =
-      static_cast<uint32_t>(arraysize(read_buffer) * sizeof(read_buffer[0]));
-  memset(read_buffer, 0, num_bytes);
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerReadData(
-          UserPointer<void>(read_buffer), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(100u, num_bytes);
-  EXPECT_EQ(0, memcmp(read_buffer, &test_data[10], 100u));
-
-  dp->ProducerClose();
-  dp->ConsumerClose();
-}
-
-// Tests the behavior of closing the producer or consumer with respect to
-// writes and reads (simple and two-phase).
-TEST(LocalDataPipeTest, CloseWriteRead) {
-  const char kTestData[] = "hello world";
-  const uint32_t kTestDataSize = static_cast<uint32_t>(sizeof(kTestData));
-
-  const MojoCreateDataPipeOptions options = {
-      kSizeOfOptions,                           // |struct_size|.
-      MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE,  // |flags|.
-      1u,                                       // |element_num_bytes|.
-      1000u                                     // |capacity_num_bytes|.
-  };
-  MojoCreateDataPipeOptions validated_options = {0};
-  EXPECT_EQ(MOJO_RESULT_OK,
-            DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                            &validated_options));
-
-  // Close producer first, then consumer.
-  {
-    scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-
-    // Write some data, so we'll have something to read.
-    uint32_t num_bytes = kTestDataSize;
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ProducerWriteData(UserPointer<const void>(kTestData),
-                                    MakeUserPointer(&num_bytes),
-                                    false));
-    EXPECT_EQ(kTestDataSize, num_bytes);
-
-    // Write it again, so we'll have something left over.
-    num_bytes = kTestDataSize;
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ProducerWriteData(UserPointer<const void>(kTestData),
-                                    MakeUserPointer(&num_bytes),
-                                    false));
-    EXPECT_EQ(kTestDataSize, num_bytes);
-
-    // Start two-phase write.
-    void* write_buffer_ptr = nullptr;
-    num_bytes = 0u;
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ProducerBeginWriteData(MakeUserPointer(&write_buffer_ptr),
-                                         MakeUserPointer(&num_bytes),
-                                         false));
-    EXPECT_TRUE(write_buffer_ptr);
-    EXPECT_GT(num_bytes, 0u);
-
-    // Start two-phase read.
-    const void* read_buffer_ptr = nullptr;
-    num_bytes = 0u;
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ConsumerBeginReadData(MakeUserPointer(&read_buffer_ptr),
-                                        MakeUserPointer(&num_bytes),
-                                        false));
-    EXPECT_TRUE(read_buffer_ptr);
-    EXPECT_EQ(2u * kTestDataSize, num_bytes);
-
-    // Close the producer.
-    dp->ProducerClose();
-
-    // The consumer can finish its two-phase read.
-    EXPECT_EQ(0, memcmp(read_buffer_ptr, kTestData, kTestDataSize));
-    EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerEndReadData(kTestDataSize));
-
-    // And start another.
-    read_buffer_ptr = nullptr;
-    num_bytes = 0u;
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ConsumerBeginReadData(MakeUserPointer(&read_buffer_ptr),
-                                        MakeUserPointer(&num_bytes),
-                                        false));
-    EXPECT_TRUE(read_buffer_ptr);
-    EXPECT_EQ(kTestDataSize, num_bytes);
-
-    // Close the consumer, which cancels the two-phase read.
-    dp->ConsumerClose();
-  }
-
-  // Close consumer first, then producer.
-  {
-    scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-
-    // Write some data, so we'll have something to read.
-    uint32_t num_bytes = kTestDataSize;
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ProducerWriteData(UserPointer<const void>(kTestData),
-                                    MakeUserPointer(&num_bytes),
-                                    false));
-    EXPECT_EQ(kTestDataSize, num_bytes);
-
-    // Start two-phase write.
-    void* write_buffer_ptr = nullptr;
-    num_bytes = 0u;
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ProducerBeginWriteData(MakeUserPointer(&write_buffer_ptr),
-                                         MakeUserPointer(&num_bytes),
-                                         false));
-    EXPECT_TRUE(write_buffer_ptr);
-    ASSERT_GT(num_bytes, kTestDataSize);
-
-    // Start two-phase read.
-    const void* read_buffer_ptr = nullptr;
-    num_bytes = 0u;
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ConsumerBeginReadData(MakeUserPointer(&read_buffer_ptr),
-                                        MakeUserPointer(&num_bytes),
-                                        false));
-    EXPECT_TRUE(read_buffer_ptr);
-    EXPECT_EQ(kTestDataSize, num_bytes);
-
-    // Close the consumer.
-    dp->ConsumerClose();
-
-    // Actually write some data. (Note: Premature freeing of the buffer would
-    // probably only be detected under ASAN or similar.)
-    memcpy(write_buffer_ptr, kTestData, kTestDataSize);
-    // Note: Even though the consumer has been closed, ending the two-phase
-    // write will report success.
-    EXPECT_EQ(MOJO_RESULT_OK, dp->ProducerEndWriteData(kTestDataSize));
-
-    // But trying to write should result in failure.
-    num_bytes = kTestDataSize;
-    EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION,
-              dp->ProducerWriteData(UserPointer<const void>(kTestData),
-                                    MakeUserPointer(&num_bytes),
-                                    false));
-
-    // As will trying to start another two-phase write.
-    write_buffer_ptr = nullptr;
-    num_bytes = 0u;
-    EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION,
-              dp->ProducerBeginWriteData(MakeUserPointer(&write_buffer_ptr),
-                                         MakeUserPointer(&num_bytes),
-                                         false));
-
-    dp->ProducerClose();
-  }
-
-  // Test closing the consumer first, then the producer, with an active
-  // two-phase write.
-  {
-    scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-
-    // Start two-phase write.
-    void* write_buffer_ptr = nullptr;
-    uint32_t num_bytes = 0u;
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ProducerBeginWriteData(MakeUserPointer(&write_buffer_ptr),
-                                         MakeUserPointer(&num_bytes),
-                                         false));
-    EXPECT_TRUE(write_buffer_ptr);
-    ASSERT_GT(num_bytes, kTestDataSize);
-
-    dp->ConsumerClose();
-    dp->ProducerClose();
-  }
-
-  // Test closing the producer and then trying to read (with no data).
-  {
-    scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-
-    // Write some data, so we'll have something to read.
-    uint32_t num_bytes = kTestDataSize;
-    EXPECT_EQ(MOJO_RESULT_OK,
-              dp->ProducerWriteData(UserPointer<const void>(kTestData),
-                                    MakeUserPointer(&num_bytes),
-                                    false));
-    EXPECT_EQ(kTestDataSize, num_bytes);
-
-    // Close the producer.
-    dp->ProducerClose();
-
-    // Read that data.
-    char buffer[1000];
-    num_bytes = static_cast<uint32_t>(sizeof(buffer));
-    EXPECT_EQ(
-        MOJO_RESULT_OK,
-        dp->ConsumerReadData(
-            UserPointer<void>(buffer), MakeUserPointer(&num_bytes), false));
-    EXPECT_EQ(kTestDataSize, num_bytes);
-    EXPECT_EQ(0, memcmp(buffer, kTestData, kTestDataSize));
-
-    // A second read should fail.
-    num_bytes = static_cast<uint32_t>(sizeof(buffer));
-    EXPECT_EQ(
-        MOJO_RESULT_FAILED_PRECONDITION,
-        dp->ConsumerReadData(
-            UserPointer<void>(buffer), MakeUserPointer(&num_bytes), false));
-
-    // A two-phase read should also fail.
-    const void* read_buffer_ptr = nullptr;
-    num_bytes = 0u;
-    EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION,
-              dp->ConsumerBeginReadData(MakeUserPointer(&read_buffer_ptr),
-                                        MakeUserPointer(&num_bytes),
-                                        false));
-
-    // Ditto for discard.
-    num_bytes = 10u;
-    EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION,
-              dp->ConsumerDiscardData(MakeUserPointer(&num_bytes), false));
-
-    dp->ConsumerClose();
-  }
-}
-
-TEST(LocalDataPipeTest, TwoPhaseMoreInvalidArguments) {
-  const MojoCreateDataPipeOptions options = {
-      kSizeOfOptions,                           // |struct_size|.
-      MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE,  // |flags|.
-      static_cast<uint32_t>(sizeof(int32_t)),   // |element_num_bytes|.
-      10 * sizeof(int32_t)                      // |capacity_num_bytes|.
-  };
-  MojoCreateDataPipeOptions validated_options = {0};
-  EXPECT_EQ(MOJO_RESULT_OK,
-            DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                            &validated_options));
-
-  scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-
-  // No data.
-  uint32_t num_bytes = 1000u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(0u, num_bytes);
-
-  // Try "ending" a two-phase write when one isn't active.
-  EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION,
-            dp->ProducerEndWriteData(1u * sizeof(int32_t)));
-
-  // Still no data.
-  num_bytes = 1000u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(0u, num_bytes);
-
-  // Try ending a two-phase write with an invalid amount (too much).
-  num_bytes = 0u;
-  void* write_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerBeginWriteData(
-          MakeUserPointer(&write_ptr), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT,
-            dp->ProducerEndWriteData(num_bytes +
-                                     static_cast<uint32_t>(sizeof(int32_t))));
-
-  // But the two-phase write still ended.
-  EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION, dp->ProducerEndWriteData(0u));
-
-  // Still no data.
-  num_bytes = 1000u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(0u, num_bytes);
-
-  // Try ending a two-phase write with an invalid amount (not a multiple of the
-  // element size).
-  num_bytes = 0u;
-  write_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ProducerBeginWriteData(
-          MakeUserPointer(&write_ptr), MakeUserPointer(&num_bytes), false));
-  EXPECT_GE(num_bytes, 1u);
-  EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT, dp->ProducerEndWriteData(1u));
-
-  // But the two-phase write still ended.
-  EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION, dp->ProducerEndWriteData(0u));
-
-  // Still no data.
-  num_bytes = 1000u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(0u, num_bytes);
-
-  // Now write some data, so we'll be able to try reading.
-  int32_t element = 123;
-  num_bytes = 1u * sizeof(int32_t);
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ProducerWriteData(UserPointer<const void>(&element),
-                                  MakeUserPointer(&num_bytes),
-                                  false));
-
-  // One element available.
-  num_bytes = 0u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(1u * sizeof(int32_t), num_bytes);
-
-  // Try "ending" a two-phase read when one isn't active.
-  EXPECT_EQ(MOJO_RESULT_FAILED_PRECONDITION,
-            dp->ConsumerEndReadData(1u * sizeof(int32_t)));
-
-  // Still one element available.
-  num_bytes = 0u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(1u * sizeof(int32_t), num_bytes);
-
-  // Try ending a two-phase read with an invalid amount (too much).
-  num_bytes = 0u;
-  const void* read_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerBeginReadData(
-          MakeUserPointer(&read_ptr), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT,
-            dp->ConsumerEndReadData(num_bytes +
-                                    static_cast<uint32_t>(sizeof(int32_t))));
-
-  // Still one element available.
-  num_bytes = 0u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(1u * sizeof(int32_t), num_bytes);
-
-  // Try ending a two-phase read with an invalid amount (not a multiple of the
-  // element size).
-  num_bytes = 0u;
-  read_ptr = nullptr;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerBeginReadData(
-          MakeUserPointer(&read_ptr), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(1u * sizeof(int32_t), num_bytes);
-  EXPECT_EQ(123, static_cast<const int32_t*>(read_ptr)[0]);
-  EXPECT_EQ(MOJO_RESULT_INVALID_ARGUMENT, dp->ConsumerEndReadData(1u));
-
-  // Still one element available.
-  num_bytes = 0u;
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerQueryData(MakeUserPointer(&num_bytes)));
-  EXPECT_EQ(1u * sizeof(int32_t), num_bytes);
-
-  dp->ProducerClose();
-  dp->ConsumerClose();
-}
-
-// Tests that even with "may discard", the data won't change under a two-phase
-// read.
-// TODO(vtl): crbug.com/348644: We currently don't pass this. (There are two
-// related issues: First, we don't recognize that the data given to
-// |ConsumerBeginReadData()| isn't discardable until |ConsumerEndReadData()|,
-// and thus we erroneously allow |ProducerWriteData()| to succeed. Second, the
-// |ProducerWriteData()| then changes the data underneath the two-phase read.)
-TEST(LocalDataPipeTest, DISABLED_MayDiscardTwoPhaseConsistent) {
-  const MojoCreateDataPipeOptions options = {
-      kSizeOfOptions,                                  // |struct_size|.
-      MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_MAY_DISCARD,  // |flags|.
-      1,                                               // |element_num_bytes|.
-      2                                                // |capacity_num_bytes|.
-  };
-  MojoCreateDataPipeOptions validated_options = {0};
-  EXPECT_EQ(MOJO_RESULT_OK,
-            DataPipe::ValidateCreateOptions(MakeUserPointer(&options),
-                                            &validated_options));
-
-  scoped_refptr<LocalDataPipe> dp(new LocalDataPipe(validated_options));
-
-  // Write some elements.
-  char elements[2] = {'a', 'b'};
-  uint32_t num_bytes = 2u;
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ProducerWriteData(UserPointer<const void>(elements),
-                                  MakeUserPointer(&num_bytes),
-                                  false));
-  EXPECT_EQ(2u, num_bytes);
-
-  // Begin reading.
-  const void* read_ptr = nullptr;
-  num_bytes = 2u;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerBeginReadData(
-          MakeUserPointer(&read_ptr), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(2u, num_bytes);
-  EXPECT_EQ('a', static_cast<const char*>(read_ptr)[0]);
-  EXPECT_EQ('b', static_cast<const char*>(read_ptr)[1]);
-
-  // Try to write some more. But nothing should be discardable right now.
-  elements[0] = 'x';
-  elements[1] = 'y';
-  num_bytes = 2u;
-  // TODO(vtl): This should be:
-  //  EXPECT_EQ(MOJO_RESULT_SHOULD_WAIT,
-  //            dp->ProducerWriteData(elements, &num_bytes, false));
-  // but we incorrectly think that the bytes being read are discardable. Letting
-  // this through reveals the significant consequence.
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ProducerWriteData(UserPointer<const void>(elements),
-                                  MakeUserPointer(&num_bytes),
-                                  false));
-
-  // Check that our read buffer hasn't changed underneath us.
-  EXPECT_EQ('a', static_cast<const char*>(read_ptr)[0]);
-  EXPECT_EQ('b', static_cast<const char*>(read_ptr)[1]);
-
-  // End reading.
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerEndReadData(2u));
-
-  // Now writing should succeed.
-  EXPECT_EQ(MOJO_RESULT_OK,
-            dp->ProducerWriteData(UserPointer<const void>(elements),
-                                  MakeUserPointer(&num_bytes),
-                                  false));
-
-  // And if we read, we should get the new values.
-  read_ptr = nullptr;
-  num_bytes = 2u;
-  EXPECT_EQ(
-      MOJO_RESULT_OK,
-      dp->ConsumerBeginReadData(
-          MakeUserPointer(&read_ptr), MakeUserPointer(&num_bytes), false));
-  EXPECT_EQ(2u, num_bytes);
-  EXPECT_EQ('x', static_cast<const char*>(read_ptr)[0]);
-  EXPECT_EQ('y', static_cast<const char*>(read_ptr)[1]);
-
-  // End reading.
-  EXPECT_EQ(MOJO_RESULT_OK, dp->ConsumerEndReadData(2u));
-
-  dp->ProducerClose();
-  dp->ConsumerClose();
-}
-
-}  // namespace
-}  // namespace system
-}  // namespace mojo