unittests for Chromoting native messaging host.

remoting/host/setup/native_messaging_writer_unittest.cc

+// 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 "remoting/host/setup/native_messaging_writer.h"
+
+#include "base/basictypes.h"
+#include "base/json/json_reader.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/platform_file.h"
+#include "base/stl_util.h"
+#include "base/values.h"
+#include "remoting/host/setup/test_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace remoting {
+
+class NativeMessagingWriterTest : public testing::Test {
+ public:
+  NativeMessagingWriterTest();
+  virtual ~NativeMessagingWriterTest();
+
+  virtual void SetUp() OVERRIDE;
+  virtual void TearDown() OVERRIDE;
+
+ protected:
+  scoped_ptr<NativeMessagingWriter> writer_;
+  base::PlatformFile read_handle_;
+  base::PlatformFile write_handle_;
+  bool read_handle_open_;
+};
+
+NativeMessagingWriterTest::NativeMessagingWriterTest() {}
+
+NativeMessagingWriterTest::~NativeMessagingWriterTest() {}
+
+void NativeMessagingWriterTest::SetUp() {
+  ASSERT_TRUE(MakePipe(&read_handle_, &write_handle_));
+  writer_.reset(new NativeMessagingWriter(write_handle_));
+  read_handle_open_ = true;
+}
+
+void NativeMessagingWriterTest::TearDown() {
+  // |write_handle_| is owned by NativeMessagingWriter's FileStream, so don't
+  // try to close it here. And close |read_handle_| only if it hasn't
+  // already been closed.
+  if (read_handle_open_)
+    base::ClosePlatformFile(read_handle_);
+}
+
+TEST_F(NativeMessagingWriterTest, GoodMessage) {
+  base::DictionaryValue message;
+  message.SetInteger("foo", 42);
+  EXPECT_TRUE(writer_->WriteMessage(message));
+
+  // Read from the pipe and verify the content.
+  uint32 length;
+  int read = base::ReadPlatformFileAtCurrentPos(
+      read_handle_, reinterpret_cast<char*>(&length), 4);
+  EXPECT_EQ(4, read);
+  std::string content(length, '\0');
+  read = base::ReadPlatformFileAtCurrentPos(read_handle_,
+                                            string_as_array(&content), length);
+  EXPECT_EQ(static_cast<int>(length), read);
+
+  // |content| should now contain serialized |message|.
+  scoped_ptr<base::Value> written_message(base::JSONReader::Read(content));
+  EXPECT_TRUE(message.Equals(written_message.get()));
+
+  // Nothing more should have been written. Close the write-end of the pipe,
+  // and verify the read end immediately hits EOF.
+  writer_.reset(NULL);
+  char unused;
+  read = base::ReadPlatformFileAtCurrentPos(read_handle_, &unused, 1);
+  EXPECT_LE(read, 0);
+}
+
+TEST_F(NativeMessagingWriterTest, SecondMessage) {
+  base::DictionaryValue message1;
+  base::DictionaryValue message2;
+  message2.SetInteger("foo", 42);
+  EXPECT_TRUE(writer_->WriteMessage(message1));
+  EXPECT_TRUE(writer_->WriteMessage(message2));
+  writer_.reset(NULL);
+
+  // Read two messages.
+  uint32 length;
+  int read;
+  std::string content;
+  for (int i = 0; i < 2; i++) {
+    read = base::ReadPlatformFileAtCurrentPos(
+        read_handle_, reinterpret_cast<char*>(&length), 4);
+    EXPECT_EQ(4, read) << "i = " << i;
+    content.resize(length);
+    read = base::ReadPlatformFileAtCurrentPos(read_handle_,
+                                              string_as_array(&content),
+                                              length);
+    EXPECT_EQ(static_cast<int>(length), read) << "i = " << i;
+  }
+
+  // |content| should now contain serialized |message2|.
+  scoped_ptr<base::Value> written_message2(base::JSONReader::Read(content));
+  EXPECT_TRUE(message2.Equals(written_message2.get()));
+}
+
+TEST_F(NativeMessagingWriterTest, FailedWrite) {
+  // Close the read end so that writing fails immediately.
+  base::ClosePlatformFile(read_handle_);
+  read_handle_open_ = false;
+
+  base::DictionaryValue message;
+  EXPECT_FALSE(writer_->WriteMessage(message));
+}
+
+}  // namespace remoting