Mojo C++ bindings: make String16 and gfx::Size available in Blink

third_party/WebKit/Source/platform/mojo/CommonCustomTypesStructTraitsTest.cpp

+// 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 "base/macros.h"
+#include "base/run_loop.h"
+#include "mojo/common/test_common_custom_types.mojom-blink.h"
+#include "mojo/public/cpp/bindings/binding_set.h"
+#include "public/platform/WebString.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+namespace {
+
+template <typename T>
+struct BounceTestTraits {
+    static void ExpectEquality(const T& a, const T& b)
+    {
+        EXPECT_EQ(a, b);
+    }
+};
+
+template <typename T>
+struct PassTraits {
+    using Type = const T&;
+};
+
+template <typename T>
+void DoExpectResponse(T* expectedValue, const base::Closure& closure, typename PassTraits<T>::Type value)
+{
+    BounceTestTraits<T>::ExpectEquality(*expectedValue, value);
+    closure.Run();
+}
+
+template <typename T>
+base::Callback<void(typename PassTraits<T>::Type)> ExpectResponse(T* expectedValue, const base::Closure& closure)
+{
+    return base::Bind(&DoExpectResponse<T>, expectedValue, closure);
+}
+
+class TestString16Impl : public mojo::common::test::blink::TestString16 {
+public:
+    explicit TestString16Impl(mojo::common::test::blink::TestString16Request request)
+        : m_binding(this, std::move(request)) {}
+
+    // TestString16 implementation:
+    void BounceString16(const WebString& in, const BounceString16Callback& callback) override
+    {
+        callback.Run(in);
+    }
+
+private:
+    mojo::Binding<mojo::common::test::blink::TestString16> m_binding;
+};
+
+class CommonCustomTypesStructTraitsTest : public testing::Test {
+protected:
+    CommonCustomTypesStructTraitsTest() {}
+    ~CommonCustomTypesStructTraitsTest() override {}
+
+private:
+    DISALLOW_COPY_AND_ASSIGN(CommonCustomTypesStructTraitsTest);
+};
+
+} // namespace
+
+TEST_F(CommonCustomTypesStructTraitsTest, String16)
+{
+    base::RunLoop runLoop;

[Ken Rockot(use gerrit already), 2016/09/29 22:00:48]

nit: You could avoid needing a RunLoop by marking BounceString16 with [Sync] in
the mojom. Then you can just:

  WebString response;
  ptr->BounceString16(str, &response);
  EXPECT_EQ(str, response);

This is OK to do since it's just a testing interface.

[Zhiqiang Zhang (Slow), 2016/09/30 17:55:53]

You're right. Done :)

+
+    mojo::common::test::blink::TestString16Ptr ptr;
+    TestString16Impl impl(GetProxy(&ptr));
+
+    WebString str = WebString::fromUTF8("hello world");
+
+    ptr->BounceString16(str, ExpectResponse(&str, runLoop.QuitClosure()));
+
+    runLoop.Run();
+
+}
+
+TEST_F(CommonCustomTypesStructTraitsTest, EmptyString16)
+{
+    base::RunLoop runLoop;
+
+    mojo::common::test::blink::TestString16Ptr ptr;
+    TestString16Impl impl(GetProxy(&ptr));
+
+    // WebString str = WebString::fromUTF8("");
+    WebString str = WebString::fromUTF8("");
+
+    ptr->BounceString16(str, ExpectResponse(&str, runLoop.QuitClosure()));
+
+    runLoop.Run();
+
+}
+
+} // namespace blink