Mojo: Add an extremely skeletal mojo_shell_tests.

mojo/shell/child_process_host_unittest.cc

Index: mojo/shell/child_process_host_unittest.cc
diff --git a/mojo/shell/child_process_host_unittest.cc b/mojo/shell/child_process_host_unittest.cc
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+++ b/mojo/shell/child_process_host_unittest.cc
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+// 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.
+
+// Note: This file also tests child_process.*.
+
+#include "mojo/shell/child_process_host.h"
+
+#include "base/logging.h"
+#include "base/macros.h"
+#include "base/message_loop/message_loop.h"
+#include "mojo/common/message_pump_mojo.h"
+#include "mojo/shell/context.h"
+#include "mojo/shell/shell_test_base.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace mojo {
+namespace shell {
+namespace test {
+namespace {
+
+class TestChildProcessHostDelegate : public ChildProcessHost::Delegate {
+ public:
+  TestChildProcessHostDelegate() {}
+  virtual ~TestChildProcessHostDelegate() {}
+  virtual void WillStart() OVERRIDE {
+    VLOG(2) << "TestChildProcessHostDelegate::WillStart()";
+  }
+  virtual void DidStart(bool success) OVERRIDE {
+    VLOG(2) << "TestChildProcessHostDelegate::DidStart(" << success << ")";
+    base::MessageLoop::current()->QuitWhenIdle();
+  }
+};
+
+typedef ShellTestBase ChildProcessHostTest;
+
+TEST_F(ChildProcessHostTest, Basic) {
+  base::MessageLoop message_loop(
+      scoped_ptr<base::MessagePump>(new common::MessagePumpMojo()));
+
+  Context context;
+  TestChildProcessHostDelegate child_process_host_delegate;
+  ChildProcessHost child_process_host(&context,
+                                      &child_process_host_delegate,
+                                      ChildProcess::TYPE_TEST);
+  child_process_host.Start();
+  message_loop.Run();
+  int exit_code = child_process_host.Join();
+  VLOG(2) << "Joined child: exit_code = " << exit_code;
+  EXPECT_EQ(0, exit_code);
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace shell
+}  // namespace mojo