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mojo/shell/data_pipe_peek_unittest.cc

+// Copyright 2014 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/shell/application_manager/data_pipe_peek.h"
+
+#include "mojo/shell/context.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace mojo {
+namespace shell {
+namespace {
+
+TEST(DataPipePeek, PeekNBytes) {
+  Context::EnsureEmbedderIsInitialized();
+
+  DataPipe data_pipe;
+  DataPipeConsumerHandle consumer(data_pipe.consumer_handle.get());
+  DataPipeProducerHandle producer(data_pipe.producer_handle.get());
+
+  // Inialize the pipe with 4 bytes.
+
+  const char* s4 = "1234";
+  uint32_t num_bytes4 = 4;
+  EXPECT_EQ(MOJO_RESULT_OK,
+            WriteDataRaw(producer, s4, &num_bytes4, MOJO_WRITE_DATA_FLAG_NONE));
+  EXPECT_EQ(4u, num_bytes4);
+
+  // We're not consuming data, so peeking for 4 bytes should always succeed.
+
+  std::string bytes;
+  MojoDeadline timeout = 0;
+  EXPECT_TRUE(BlockingPeekNBytes(consumer, &bytes, num_bytes4, timeout));
+  EXPECT_EQ(bytes, std::string(s4));
+
+  timeout = 1000;  // 1ms
+  EXPECT_TRUE(BlockingPeekNBytes(consumer, &bytes, num_bytes4, timeout));
+  EXPECT_EQ(bytes, std::string(s4));
+
+  timeout = MOJO_DEADLINE_INDEFINITE;
+  EXPECT_TRUE(BlockingPeekNBytes(consumer, &bytes, num_bytes4, timeout));
+  EXPECT_EQ(bytes, std::string(s4));
+
+  // Peeking for 5 bytes should fail, until another byte is written.
+
+  uint32_t bytes1 = 1;
+  uint32_t num_bytes5 = 5;
+  const char* s1 = "5";
+  const char* s5 = "12345";
+
+  timeout = 0;
+  EXPECT_FALSE(BlockingPeekNBytes(consumer, &bytes, num_bytes5, timeout));
+
+  timeout = 500;  // Should cause peek to timeout after about 0.5ms.
+  EXPECT_FALSE(BlockingPeekNBytes(consumer, &bytes, num_bytes5, timeout));
+
+  EXPECT_EQ(MOJO_RESULT_OK,
+            WriteDataRaw(producer, s1, &bytes1, MOJO_WRITE_DATA_FLAG_NONE));
+  EXPECT_EQ(1u, bytes1);
+
+  EXPECT_TRUE(BlockingPeekNBytes(consumer, &bytes, num_bytes5, timeout));
+  EXPECT_EQ(bytes, std::string(s5));
+
+  // If the consumer side of the pipe is closed, peek should fail.
+
+  data_pipe.consumer_handle.reset();
+  timeout = 0;
+  EXPECT_FALSE(BlockingPeekNBytes(consumer, &bytes, num_bytes5, timeout));
+}
+
+TEST(DataPipePeek, PeekLine) {
+  Context::EnsureEmbedderIsInitialized();
+
+  DataPipe data_pipe;
+  DataPipeConsumerHandle consumer(data_pipe.consumer_handle.get());
+  DataPipeProducerHandle producer(data_pipe.producer_handle.get());
+
+  // Inialize the pipe with 4 bytes and no newline.
+
+  const char* s4 = "1234";
+  uint32_t num_bytes4 = 4;
+  EXPECT_EQ(MOJO_RESULT_OK,
+            WriteDataRaw(producer, s4, &num_bytes4, MOJO_WRITE_DATA_FLAG_NONE));
+  EXPECT_EQ(4u, num_bytes4);
+
+  // Peeking for a line should fail.
+
+  std::string str;
+  size_t max_str_length = 5;
+  MojoDeadline timeout = 0;
+  EXPECT_FALSE(BlockingPeekLine(consumer, &str, max_str_length, timeout));
+
+  // Writing a newline should cause PeekLine to succeed.
+
+  uint32_t bytes1 = 1;
+  const char* s1 = "\n";
+  EXPECT_EQ(MOJO_RESULT_OK,
+            WriteDataRaw(producer, s1, &bytes1, MOJO_WRITE_DATA_FLAG_NONE));
+  EXPECT_EQ(1u, bytes1);
+
+  EXPECT_TRUE(BlockingPeekLine(consumer, &str, max_str_length, timeout));
+  EXPECT_EQ(str, std::string(s4) + "\n");
+
+  // If the max_line_length parameter is less than the length of the
+  // newline terminated string, then peek should fail.
+
+  max_str_length = 3;
+  EXPECT_FALSE(BlockingPeekLine(consumer, &str, max_str_length, timeout));
+}
+
+}  // namespace
+}  // namespace shell
+}  // namespace mojo