Add CDM FileIO tests.

media/cdm/ppapi/cdm_file_io_test.h

Index: media/cdm/ppapi/cdm_file_io_test.h
diff --git a/media/cdm/ppapi/cdm_file_io_test.h b/media/cdm/ppapi/cdm_file_io_test.h
new file mode 100644
index 0000000000000000000000000000000000000000..3e0060cc3bf16eb7a83850fd2ae772a306963882
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+++ b/media/cdm/ppapi/cdm_file_io_test.h
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+// 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.
+
+#ifndef MEDIA_CDM_PPAPI_CDM_FILE_IO_TEST_H_
+#define MEDIA_CDM_PPAPI_CDM_FILE_IO_TEST_H_
+
+#include <list>
+#include <stack>
+#include <string>
+#include <vector>
+
+#include "base/callback.h"
+#include "base/compiler_specific.h"
+#include "media/cdm/ppapi/api/content_decryption_module.h"
+
+namespace media {
+
+typedef base::Callback<void(bool success)> CompletionCB;
+typedef base::Callback<cdm::FileIO*(cdm::FileIOClient* client)> CreateFileIOCB;
+
+// A customizable test class that tests cdm::FileIO implementation.
+// - To create a test, call AddTestStep() to add a test step. A test step can be
+//   either an action to make (use ACTION_* types), or a result to verify (use
+//   RESULT_* types).
+// - To run the test, simply call Run() with a completion callback. The result
+//   will be reported in the completion callback when the test is finished.
+//
+// The following rules apply to the test steps:
+// - Test steps are ordered (with the exception that results in a result group
+//   is not ordered).
+// - Consecutive action steps form an "action group". Consecutively result
+//   steps form a "result group". An action group is followed by a result
+//   group and vice versa.
+// - A test must start with an action group.
+// - To process an action group, the test runner runs (and clears) all steps
+//   in the group in the order they were added. Then it waits for test
+//   results.
+// - When a cdm::FileIOClient method is called, the test runner compares the
+//   result with all results in the current result group. If no result in that
+//   group matches the test result, the test fails. Otherwise, the matching
+//   result is cleared from the group. If the group is empty, the test runner
+//   starts to process the next action group. Otherwise, the test runner keeps
+//   waiting for the next test result.
+// - After all steps are cleared, the test passes.
+class FileIOTest : public cdm::FileIOClient {
+ public:
+  // Types of allowed test steps:
+  // - ACTION_* specifies the next step to test.
+  // - RESULT_* specifies the expected result of the previous step(s).
+  enum StepType {
+    ACTION_CREATE,
+    ACTION_OPEN,  // |test_name_| will be used used as the file name to open.
+    RESULT_OPEN,
+    ACTION_READ,
+    RESULT_READ,
+    ACTION_WRITE,
+    RESULT_WRITE,
+    ACTION_CLOSE  // If ACTION_CLOSE is not specified, FileIO::Close() will be
+                  // automatically called at the end of the test.
+  };
+
+  FileIOTest(const CreateFileIOCB& create_file_io_cb,
+             const std::string& test_name);
+  ~FileIOTest();
+
+  // Adds a test step in this test. |this| object doesn't take the ownership of
+  // |data|, which should be valid throughout the lifetime of |this| object.
+  void AddTestStep(
+      StepType type, Status status, const uint8* data, uint32 data_size);
+
+  // Runs this test case and returns the test result through |completion_cb|.
+  void Run(const CompletionCB& completion_cb);
+
+ private:
+  struct TestStep {
+    // |this| object doesn't take the ownership of |data|, which should be valid
+    // throughout the lifetime of |this| object.
+    TestStep(StepType type, Status status, const uint8* data, uint32 data_size)
+        : type(type), status(status), data(data), data_size(data_size) {}
+
+    StepType type;
+
+    // Expected status for RESULT* steps.
+    Status status;
+
+    // Data to write in ACTION_WRITE, or read data in RESULT_READ.
+    const uint8* data;
+    uint32 data_size;
+  };
+
+  // Returns whether |test_step| is a RESULT_* step.
+  static bool IsResult(const TestStep& test_step);
+
+  // Returns whether two results match.
+  static bool MatchesResult(const TestStep& a, const TestStep& b);
+
+  // cdm::FileIOClient implementation.
+  virtual void OnOpenComplete(Status status) OVERRIDE;
+  virtual void OnReadComplete(Status status,
+                              const uint8_t* data,
+                              uint32_t data_size) OVERRIDE;
+  virtual void OnWriteComplete(Status status) OVERRIDE;
+
+  // Runs the next step in this test case.
+  void RunNextStep();
+
+  void OnResult(const TestStep& result);
+
+  // Checks whether the test result matches this step. This can only be called
+  // when this step is a RESULT_* step.
+  bool CheckResult(const TestStep& result);
+
+  void OnTestComplete(bool success);
+
+  CreateFileIOCB create_file_io_cb_;
+  CompletionCB completion_cb_;
+
+  std::string test_name_;
+  std::list<TestStep> test_steps_;
+
+  // All opened cdm::FileIO objects. We keep multiple cdm::FileIO objects open
+  // so that we can test multiple cdm::FileIO objects accessing the same file.
+  // In the current implementation, all ACTION_* are performed on the latest
+  // opened cdm::FileIO object, hence the stack.
+  std::stack<cdm::FileIO*> file_io_stack_;
+};
+
+// Tests cdm::FileIO implementation.
+class FileIOTestRunner {
+ public:
+  explicit FileIOTestRunner(const CreateFileIOCB& create_file_io_cb);
+  ~FileIOTestRunner();
+
+  void AddTests();
+
+  // Run all tests. When tests are completed, the result will be reported in the
+  // |completion_cb|.
+  void RunAllTests(const CompletionCB& completion_cb);
+
+ private:
+  void OnTestComplete(bool success);
+  void RunNextTest();
+
+  CreateFileIOCB create_file_io_cb_;
+  CompletionCB completion_cb_;
+  std::list<FileIOTest> remaining_tests_;
+  std::vector<uint8> large_data_;
+  size_t total_num_tests_;  // Total number of tests.
+  size_t num_passed_tests_;  // Number of passed tests.
+
+  DISALLOW_COPY_AND_ASSIGN (FileIOTestRunner);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_CDM_PPAPI_CDM_FILE_IO_TEST_H_