102 lines
3.7 KiB
C++
102 lines
3.7 KiB
C++
// Copyright 2020 The Dawn 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 <gmock/gmock.h>
|
|
|
|
#include "common/Assert.h"
|
|
|
|
#include <memory>
|
|
#include <set>
|
|
|
|
namespace testing {
|
|
|
|
template <typename F>
|
|
class MockCallback;
|
|
|
|
// Helper class for mocking callbacks used for Dawn callbacks with |void* userdata|
|
|
// as the last callback argument.
|
|
//
|
|
// Example Usage:
|
|
// MockCallback<WGPUDeviceLostCallback> mock;
|
|
//
|
|
// void* foo = XYZ; // this is the callback userdata
|
|
//
|
|
// wgpuDeviceSetDeviceLostCallback(device, mock.Callback(), mock.MakeUserdata(foo));
|
|
// EXPECT_CALL(mock, Call(_, foo));
|
|
template <typename R, typename... Args>
|
|
class MockCallback<R (*)(Args...)> : public ::testing::MockFunction<R(Args...)> {
|
|
using CallbackType = R (*)(Args...);
|
|
|
|
public:
|
|
// Helper function makes it easier to get the callback using |foo.Callback()|
|
|
// unstead of MockCallback<CallbackType>::Callback.
|
|
static CallbackType Callback() {
|
|
return CallUnboundCallback;
|
|
}
|
|
|
|
void* MakeUserdata(void* userdata) {
|
|
auto mockAndUserdata =
|
|
std::unique_ptr<MockAndUserdata>(new MockAndUserdata{this, userdata});
|
|
|
|
// Add the userdata to a set of userdata for this mock. We never
|
|
// remove from this set even if a callback should only be called once so that
|
|
// repeated calls to the callback still forward the userdata correctly.
|
|
// Userdata will be destroyed when the mock is destroyed.
|
|
auto it = mUserdatas.insert(std::move(mockAndUserdata));
|
|
ASSERT(it.second);
|
|
return it.first->get();
|
|
}
|
|
|
|
private:
|
|
struct MockAndUserdata {
|
|
MockCallback* mock;
|
|
void* userdata;
|
|
};
|
|
|
|
static R CallUnboundCallback(Args... args) {
|
|
std::tuple<Args...> tuple = std::make_tuple(args...);
|
|
|
|
constexpr size_t ArgC = sizeof...(Args);
|
|
static_assert(ArgC >= 1, "Mock callback requires at least one argument (the userdata)");
|
|
|
|
// Get the userdata. It should be the last argument.
|
|
auto userdata = std::get<ArgC - 1>(tuple);
|
|
static_assert(std::is_same<decltype(userdata), void*>::value,
|
|
"Last callback argument must be void* userdata");
|
|
|
|
// Extract the mock.
|
|
ASSERT(userdata != nullptr);
|
|
auto* mockAndUserdata = reinterpret_cast<MockAndUserdata*>(userdata);
|
|
MockCallback* mock = mockAndUserdata->mock;
|
|
ASSERT(mock != nullptr);
|
|
|
|
// Replace the userdata
|
|
std::get<ArgC - 1>(tuple) = mockAndUserdata->userdata;
|
|
|
|
// Forward the callback to the mock.
|
|
return mock->CallImpl(std::make_index_sequence<ArgC>{}, std::move(tuple));
|
|
}
|
|
|
|
// This helper cannot be inlined because we dependent on the templated index sequence
|
|
// to unpack the tuple arguments.
|
|
template <size_t... Is>
|
|
R CallImpl(const std::index_sequence<Is...>&, std::tuple<Args...> args) {
|
|
return this->Call(std::get<Is>(args)...);
|
|
}
|
|
|
|
std::set<std::unique_ptr<MockAndUserdata>> mUserdatas;
|
|
};
|
|
|
|
} // namespace testing
|