Add a Mojo example apptest that runs in mojo_shell.

mojo/examples/test/example_apptest.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.
+
+// README: To run these tests from out/<Debug|Release>/, run:
+// ./mojo_shell --origin=file://`pwd` --disable-cache mojo:mojo_example_apptests
+
+// TODO(msw): Use mojo_main_chromium.cc mojo_environment_chromium for base/ 
+//            not mojo_main_standalone.cc and mojo_environment_standalone ??? 
+//            (a mojo_main_chromium app can test standalone services and apps) 
+
+#include "mojo/examples/test/example_service.mojom.h"
+#include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/cpp/application/application_impl.h"
+#include "mojo/public/cpp/bindings/callback.h"
+#include "mojo/public/cpp/environment/environment.h"
+#include "mojo/public/cpp/system/macros.h"
+#include "mojo/public/cpp/utility/run_loop.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+// TODO(msw): Remove these once we can get ApplicationImpl from TLS. ??? 
+mojo::ApplicationImpl* g_application_impl_hack = NULL;
+mojo::RunLoop* g_run_loop_hack = NULL;
+
+}  // namespace
+
+namespace mojo {
+
+namespace {
+
+// TODO(msw): Split example_service_apptest and example_client_apptest ??? 
+class ExampleClientImpl : public InterfaceImpl<ExampleClient> {
+ public:
+  explicit ExampleClientImpl() : last_pong_value_(0) {}
+  virtual ~ExampleClientImpl() {}
+
+  int16_t last_pong_value() const { return last_pong_value_; }
+
+ private:
+  // InterfaceImpl<ExampleClient> overrides.
+  virtual void Pong(uint16_t pong_value) MOJO_OVERRIDE {
+    last_pong_value_ = pong_value;
+    g_run_loop_hack->Quit();
+  }
+
+  int16_t last_pong_value_;
+  MOJO_DISALLOW_COPY_AND_ASSIGN(ExampleClientImpl);
+};
+
+// TODO(msw): Split example_service_apptest and example_client_apptest ??? 
+class ExampleServiceTest : public testing::Test {
+ public:
+  ExampleServiceTest() {
+    g_application_impl_hack->ConnectToService("mojo:mojo_example_service",
+                                              &example_service_);
+    example_service_.set_client(&example_client_);
+  }
+
+  virtual ~ExampleServiceTest() MOJO_OVERRIDE {
+    example_service_.reset();
+  }
+
+ protected:
+  ExampleServicePtr example_service_;
+  ExampleClientImpl example_client_;
+
+ private:
+  MOJO_DISALLOW_COPY_AND_ASSIGN(ExampleServiceTest);
+};
+
+TEST_F(ExampleServiceTest, Ping) {
+  EXPECT_EQ(0, example_client_.last_pong_value());
+  example_service_->Ping(1);
+  g_run_loop_hack->Run();
+  EXPECT_EQ(1, example_client_.last_pong_value());
+}
+
+// TODO(msw): Attempt mojo::Callbacks without base::Bind ??? 
+template <typename T>
+struct SetAndQuit : public Callback<void()>::Runnable {
+  SetAndQuit(T* val, T result) : val_(val), result_(result) {}
+  virtual ~SetAndQuit() {}
+  virtual void Run() const MOJO_OVERRIDE{
+    *val_ = result_;
+    g_run_loop_hack->Quit();
+  }
+  T* val_;
+  T result_;
+};
+
+TEST_F(ExampleServiceTest, RunCallback) {
+  bool was_run = false;
+  example_service_->RunCallback(SetAndQuit<bool>(&was_run, true));
+  g_run_loop_hack->Run();
+  EXPECT_TRUE(was_run);
+}
+
+// TODO(msw): Attempt mojo::Callbacks without base::Bind ??? 
+struct RunAllTests : public Callback<void()>::Runnable {
+  RunAllTests() {}
+  virtual ~RunAllTests() {}
+  virtual void Run() const MOJO_OVERRIDE {
+    int success = RUN_ALL_TESTS();
+    printf("RUN_ALL_TESTS returned %d.\n", success);
+  }
+};
+
+// TODO(msw): Generalize a base class like this for ShellHooks help, etc. ??? 
+class TestApp : public ApplicationDelegate {
+ public:
+  TestApp() {}
+  virtual ~TestApp() {}
+
+  virtual void Initialize(ApplicationImpl* app) MOJO_OVERRIDE {
+    printf("Running TestApp::Initialize() from example_apptest.cc\n");
+    // TODO(msw): Get actual commandline arguments ... 
+    int argc = 0;
+    char** argv = NULL;
+    testing::InitGoogleTest(&argc, argv);
+
+    // TODO(msw): Calling RUN_ALL_TESTS here yields "Bus error: 10" ... 
+    MojoTimeTicks run_all_tests_delay = 0;
+    g_run_loop_hack->PostDelayedTask(RunAllTests(), run_all_tests_delay);
+  }
+
+ private:
+  MOJO_DISALLOW_COPY_AND_ASSIGN(TestApp);
+};
+
+}  // namespace
+
+// TODO(msw): Move this and TestApp to a common mojo test helper ... 
+// static
+ApplicationDelegate* ApplicationDelegate::Create() {
+  return new TestApp();
+}
+
+}  // namespace mojo
+
+extern "C" APPLICATION_EXPORT MojoResult CDECL MojoMain(
+    MojoHandle shell_handle) {
+  mojo::Environment env;
+  // TODO(msw): Don't run a loop here, only within tests as needed ??? 
+  mojo::RunLoop loop;
+  g_run_loop_hack = &loop;
+
+  mojo::ApplicationDelegate* delegate = mojo::ApplicationDelegate::Create();
+  mojo::ApplicationImpl app(delegate);
+  app.BindShell(shell_handle);
+  g_application_impl_hack = &app;
+  g_run_loop_hack->RunUntilIdle();
+
+  printf("Exiting MojoMain.\n");
+
+  delete delegate;
+  return MOJO_RESULT_OK;
+}