Add a basic Mojo SerialService that implements GetDevices().

device/serial/serial_service_unittest.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.
+
+#include "base/bind.h"
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "device/serial/serial.mojom.h"
+#include "device/serial/serial_service_impl.h"
+#include "mojo/public/cpp/bindings/error_handler.h"
+#include "mojo/public/cpp/bindings/interface_ptr.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace device {
+
+class SerialServiceTest : public testing::Test, public mojo::ErrorHandler {
+ public:
+  SerialServiceTest() {}
+
+  void StoreDevices(mojo::Array<serial::DeviceInfoPtr> devices) {
+    devices_ = devices.Pass();
+    message_loop_.PostTask(FROM_HERE, run_loop_.QuitClosure());
+  }
+
+  virtual void OnConnectionError() OVERRIDE {
+    message_loop_.PostTask(FROM_HERE, run_loop_.QuitClosure());
+    FAIL() << "Connection error";
+  }
+
+  base::MessageLoop message_loop_;
+  base::RunLoop run_loop_;
+  mojo::Array<serial::DeviceInfoPtr> devices_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SerialServiceTest);
+};
+
+TEST_F(SerialServiceTest, GetDevices) {
+  mojo::InterfacePtr<serial::SerialService> service;
+  SerialServiceImpl::Create(mojo::Get(&service));
+  service.set_error_handler(this);
+  mojo::Array<serial::DeviceInfoPtr> result;
+  service->GetDevices(
+      base::Bind(&SerialServiceTest::StoreDevices, base::Unretained(this)));
+  run_loop_.Run();
+
+  // Because we're running on unknown hardware, only check that we received a
+  // non-null result.
+  EXPECT_TRUE(devices_);
+}
+
+}  // namespace device