Add tests for chrome.fileSystem app API.

chrome/browser/extensions/api/file_system/file_system_apitest.cc

+// Copyright (c) 2012 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 "base/file_util.h"
+#include "chrome/browser/extensions/api/file_system/file_system_api.h"
+#include "chrome/browser/extensions/platform_app_browsertest_util.h"
+
+class FileSystemApiTest : public PlatformAppBrowserTest {
+ public:
+  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
+    PlatformAppBrowserTest::SetUpCommandLine(command_line);
+    test_file_folder_ = test_data_dir_.AppendASCII("api_test")
+        .AppendASCII("file_system");
+  }
+
+  virtual void TearDown() OVERRIDE {
+    extensions::FileSystemPickerFunction::StopSkippingPicker();
+    PlatformAppBrowserTest::TearDown();
+  };
+
+ protected:
+  FilePath test_file_folder_;
+};
+
+IN_PROC_BROWSER_TEST_F(FileSystemApiTest, FileSystemApiGetDisplayPath) {
+  FilePath test_file = test_file_folder_.AppendASCII("open_existing.txt");
+  extensions::FileSystemPickerFunction::SkipPickerAndAlwaysSelectPath(
+      &test_file);
+  ASSERT_TRUE(RunPlatformAppTest("api_test/file_system/get_display_path"))
+      << message_;
+}
+
+IN_PROC_BROWSER_TEST_F(FileSystemApiTest, FileSystemApiOpenExistingFileTest) {
+  FilePath test_file = test_file_folder_.AppendASCII("open_existing.txt");
+  extensions::FileSystemPickerFunction::SkipPickerAndAlwaysSelectPath(
+      &test_file);
+  ASSERT_TRUE(RunPlatformAppTest("api_test/file_system/open_existing"))
+      << message_;
+}
+
+IN_PROC_BROWSER_TEST_F(FileSystemApiTest, FileSystemApiOpenCancelTest) {
+  extensions::FileSystemPickerFunction::SkipPickerAndAlwaysCancel();
+  ASSERT_TRUE(RunPlatformAppTest("api_test/file_system/open_cancel"))
+      << message_;
+}
+
+IN_PROC_BROWSER_TEST_F(FileSystemApiTest, FileSystemApiOpenBackgroundTest) {
+  ASSERT_TRUE(RunPlatformAppTest("api_test/file_system/open_background"))
+      << message_;
+}
+
+IN_PROC_BROWSER_TEST_F(FileSystemApiTest, FileSystemApiSaveNewFileTest) {
+  FilePath test_file = test_file_folder_.AppendASCII("save_new.txt");
+  // Make sure test file path does not exist.
+  ASSERT_TRUE(file_util::Delete(test_file, false));
+  extensions::FileSystemPickerFunction::SkipPickerAndAlwaysSelectPath(
+      &test_file);
+  ASSERT_TRUE(RunPlatformAppTest("api_test/file_system/save_new"))
+      << message_;
+}
+
+IN_PROC_BROWSER_TEST_F(FileSystemApiTest, FileSystemApiSaveExistingFileTest) {
+  FilePath test_file = test_file_folder_.AppendASCII("save_existing.txt");
+  // Replace test save file to make sure it's pristine.
+  ASSERT_TRUE(file_util::CopyFile(
+      test_file_folder_.AppendASCII("open_existing.txt"), test_file));
+  extensions::FileSystemPickerFunction::SkipPickerAndAlwaysSelectPath(
+      &test_file);
+  ASSERT_TRUE(RunPlatformAppTest("api_test/file_system/save_existing"))
+      << message_;
+}
+
+IN_PROC_BROWSER_TEST_F(FileSystemApiTest, FileSystemApiSaveCancelTest) {
+  extensions::FileSystemPickerFunction::SkipPickerAndAlwaysCancel();
+  ASSERT_TRUE(RunPlatformAppTest("api_test/file_system/save_cancel"))
+      << message_;
+}
+
+IN_PROC_BROWSER_TEST_F(FileSystemApiTest, FileSystemApiSaveBackgroundTest) {
+  ASSERT_TRUE(RunPlatformAppTest("api_test/file_system/save_background"))
+      << message_;
+}