Consolidate unittests in one binary

src/tests/unittests/ToBackendTests.cpp

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+// Copyright 2017 The NXT Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <gtest/gtest.h>
+
+#include "backend/common/RefCounted.h"
+#include "backend/common/ToBackend.h"
+
+#include <type_traits>
+
+// Make our own Base - Backend object pair, reusing the CommandBuffer name
+namespace backend {
+    class CommandBufferBase : public RefCounted {
+    };
+}
+
+using namespace backend;
+
+class MyCommandBuffer : public CommandBufferBase {
+};
+
+struct MyBackendTraits {
+    using CommandBufferType = MyCommandBuffer;
+};
+
+// Instanciate ToBackend for our "backend"
+template<typename T>
+auto ToBackend(T&& common) -> decltype(ToBackendBase<MyBackendTraits>(common)) {
+    return ToBackendBase<MyBackendTraits>(common);
+}
+
+// Test that ToBackend correctly converts pointers to base classes.
+TEST(ToBackend, Pointers) {
+    {
+        MyCommandBuffer* cmdBuf = new MyCommandBuffer;
+        const CommandBufferBase* base = cmdBuf;
+
+        auto backendCmdBuf = ToBackend(base);
+        static_assert(std::is_same<decltype(backendCmdBuf), const MyCommandBuffer*>::value, "");
+        ASSERT_EQ(cmdBuf, backendCmdBuf);
+
+        cmdBuf->Release();
+    }
+    {
+        MyCommandBuffer* cmdBuf = new MyCommandBuffer;
+        CommandBufferBase* base = cmdBuf;
+
+        auto backendCmdBuf = ToBackend(base);
+        static_assert(std::is_same<decltype(backendCmdBuf), MyCommandBuffer*>::value, "");
+        ASSERT_EQ(cmdBuf, backendCmdBuf);
+
+        cmdBuf->Release();
+    }
+}
+
+// Test that ToBackend correctly converts Refs to base classes.
+TEST(ToBackend, Ref) {
+    {
+        MyCommandBuffer* cmdBuf = new MyCommandBuffer;
+        const Ref<CommandBufferBase> base(cmdBuf);
+
+        const auto& backendCmdBuf = ToBackend(base);
+        static_assert(std::is_same<decltype(ToBackend(base)), const Ref<MyCommandBuffer>&>::value, "");
+        ASSERT_EQ(cmdBuf, backendCmdBuf.Get());
+
+        cmdBuf->Release();
+    }
+    {
+        MyCommandBuffer* cmdBuf = new MyCommandBuffer;
+        Ref<CommandBufferBase> base(cmdBuf);
+
+        auto backendCmdBuf = ToBackend(base);
+        static_assert(std::is_same<decltype(ToBackend(base)), Ref<MyCommandBuffer>&>::value, "");
+        ASSERT_EQ(cmdBuf, backendCmdBuf.Get());
+
+        cmdBuf->Release();
+    }
+}