Add the UtilityProcessMojoClient class and convert SafeJsonParser

content/browser/utility_process_mojo_client_browsertest.cc

+// Copyright 2016 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 "content/public/browser/utility_process_mojo_client.h"
+
+#include <memory>
+
+#include "base/bind.h"
+#include "base/run_loop.h"
+#include "content/public/test/content_browser_test.h"
+#include "content/public/test/test_mojo_service.mojom.h"
+
+namespace content {
+
+enum class TestCase {
+  // Value of result_test_case_ before assignment.
+  NONE,
+  // Successful call through the Mojo service with response back.
+  CALL_SERVICE,
+  // Call the Mojo service but the utility process terminates before getting
+  // the result back.
+  CONNECTION_ERROR,
+  // Call a function that fails because the sandbox is still enabled.
+  SANDBOX_FAILURE,
+  // Call a function that succeeds only when the sandbox is disabled.
+  SANDBOX_SUCCESS,
+};
+
+// Test fixture used to make different Mojo calls to the utility process.
+// Depending on the test parameter, a different function on the Mojo service
+// will be invoked.
+class UtilityProcessMojoClientBrowserTest
+    : public ContentBrowserTest,
+      public ::testing::WithParamInterface<TestCase> {
+ public:
+  void StartTest() {
+    mojo_client_.reset(new UtilityProcessMojoClient<mojom::TestMojoService>(
+        L"TestMojoProcess",
+        base::Bind(&UtilityProcessMojoClientBrowserTest::EndTest,
+                   base::Unretained(this), TestCase::CONNECTION_ERROR)));
+
+    TestCase test_case = GetParam();
+    // This test case needs to have the sandbox disabled.
+    if (test_case == TestCase::SANDBOX_SUCCESS)
+      mojo_client_->set_disable_sandbox();
+    mojo_client_->Start();
+
+    switch (test_case) {
+      case TestCase::CALL_SERVICE:
+        mojo_client_->service()->DoSomething(
+            base::Bind(&UtilityProcessMojoClientBrowserTest::EndTest,
+                       base::Unretained(this), TestCase::CALL_SERVICE));
+        break;
+      case TestCase::CONNECTION_ERROR:
+        mojo_client_->service()->DoTerminateProcess(
+            base::Bind(&UtilityProcessMojoClientBrowserTest::EndTest,
+                       base::Unretained(this), TestCase::CALL_SERVICE));
+        break;
+      case TestCase::SANDBOX_FAILURE:
+      case TestCase::SANDBOX_SUCCESS:
+        mojo_client_->service()->CreateFolder(base::Bind(
+            &UtilityProcessMojoClientBrowserTest::OnCreateFolderFinished,
+            base::Unretained(this)));
+        break;
+      case TestCase::NONE:
+        FAIL();
+        break;
+    }
+  }
+
+ protected:
+  void EndTest(TestCase result_test_case) {
+    result_test_case_ = result_test_case;
+    mojo_client_.reset();
+    done_closure_.Run();
+  }
+
+  void OnCreateFolderFinished(bool succeeded) {
+    EndTest(succeeded ? TestCase::SANDBOX_SUCCESS : TestCase::SANDBOX_FAILURE);
+  }
+
+  std::unique_ptr<UtilityProcessMojoClient<mojom::TestMojoService>>
+      mojo_client_;
+  base::Closure done_closure_;
+
+  // The test result that is compared to the current test case.
+  TestCase result_test_case_ = TestCase::NONE;
+};
+
+IN_PROC_BROWSER_TEST_P(UtilityProcessMojoClientBrowserTest, UtilityProcess) {
+  base::RunLoop run_loop;
+  done_closure_ = run_loop.QuitClosure();
+
+  StartTest();
+
+  run_loop.Run();
+  EXPECT_EQ(GetParam(), result_test_case_);
+}
+
+INSTANTIATE_TEST_CASE_P(TestCases,

[Anand Mistry (off Chromium), 2016/06/14 00:32:29]

I think this is an abuse of parametertised tests. All the test cases and
expectations are hidden inside common test code. Parameterised tests are
supposed to be for the case where you have a set of tests that need to run under
a set of different environments. i.e. different message loop types. This is just
a case of a set of tests, with a common environment. A better way would be to
have multiple tests, each calling a different service method and setting
different expectations, and common code to do the setup, running and checking of
expectations.

[Patrick Monette, 2016/06/14 21:23:32]

I've switched out of parameterized tests.

+                        UtilityProcessMojoClientBrowserTest,
+                        ::testing::Values(TestCase::CALL_SERVICE,
+                                          TestCase::CONNECTION_ERROR,
+                                          TestCase::SANDBOX_FAILURE,
+                                          TestCase::SANDBOX_SUCCESS));
+
+}  // namespace content