Mojo JS Bindings: restore the ServiceProvider class, add an application test

services/js/js_apptests.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/files/file_path.h"
+#include "base/path_service.h"
+#include "mojo/public/cpp/application/application_impl.h"
+#include "mojo/public/cpp/application/application_test_base.h"
+#include "services/js/test/echo_service.mojom.h"
+
+namespace mojo {
+namespace {
+
+class JSEchoTest : public test::ApplicationTestBase {
+ public:
+  JSEchoTest() : ApplicationTestBase() {}
+  ~JSEchoTest() override {}
+
+ protected:
+  // ApplicationTestBase:
+  void SetUp() override {
+    ApplicationTestBase::SetUp();
+    application_impl()->ConnectToService(service_path(), &echo_service_);
+  }
+
+  EchoServicePtr echo_service_;
+
+ private:
+  const std::string service_path() {
+    base::FilePath path;
+    PathService::Get(base::DIR_SOURCE_ROOT, &path);
+    path = path.AppendASCII("services")
+        .AppendASCII("js")
+        .AppendASCII("test")
+        .AppendASCII("echo.js");
+    return "file://" + path.AsUTF8Unsafe();
+  }
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(JSEchoTest);
+};
+
+struct EchoStringCallback {
+  explicit EchoStringCallback(String *s) : echo_value(s) {}
+  void Run(const String& value) const {
+    *echo_value = value;
+  }
+  String *echo_value;
+};
+
+TEST_F(JSEchoTest, EchoString) {
+  String foo;
+  EchoStringCallback callback(&foo);
+  echo_service_->EchoString("foo", callback);
+  EXPECT_TRUE(echo_service_.WaitForIncomingMethodCall());
+  EXPECT_EQ("foo", foo);
+  echo_service_->EchoString("quit", callback);
+}
+
+TEST_F(JSEchoTest, EchoEmptyString) {
+  String empty;
+  EchoStringCallback callback(&empty);
+  echo_service_->EchoString("", callback);
+  EXPECT_TRUE(echo_service_.WaitForIncomingMethodCall());
+  EXPECT_EQ("", empty);
+  echo_service_->EchoString("quit", callback);
+}
+
+TEST_F(JSEchoTest, EchoNullString) {
+  String null;
+  EchoStringCallback callback(&null);
+  echo_service_->EchoString(nullptr, callback);
+  EXPECT_TRUE(echo_service_.WaitForIncomingMethodCall());
+  EXPECT_TRUE(null.is_null());
+  echo_service_->EchoString("quit", callback);
+}
+
+}  // namespace
+}  // namespace mojo