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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <memory>
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/run_loop.h"
#include "base/task/single_thread_task_runner.h"
#include "base/test/task_environment.h"
#include "dbus/error.h"
#include "dbus/message.h"
#include "dbus/mock_bus.h"
#include "dbus/mock_exported_object.h"
#include "dbus/mock_object_proxy.h"
#include "dbus/object_path.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
using ::testing::_;
using ::testing::Invoke;
using ::testing::Return;
using ::testing::Unused;
namespace dbus {
class MockTest : public testing::Test {
public:
MockTest() = default;
void SetUp() override {
// Create a mock bus.
Bus::Options options;
options.bus_type = Bus::SYSTEM;
mock_bus_ = new MockBus(options);
// Create a mock proxy.
mock_proxy_ = new MockObjectProxy(
mock_bus_.get(),
"org.chromium.TestService",
ObjectPath("/org/chromium/TestObject"));
// Set an expectation so mock_proxy's CallMethodAndBlock() will use
// CreateMockProxyResponse() to return responses.
EXPECT_CALL(*mock_proxy_.get(), CallMethodAndBlock(_, _))
.WillRepeatedly(Invoke(this, &MockTest::CreateMockProxyResponse));
// Set an expectation so mock_proxy's CallMethod() will use
// HandleMockProxyResponseWithMessageLoop() to return responses.
EXPECT_CALL(*mock_proxy_.get(), DoCallMethod(_, _, _))
.WillRepeatedly(
Invoke(this, &MockTest::HandleMockProxyResponseWithMessageLoop));
// Set an expectation so mock_bus's GetObjectProxy() for the given
// service name and the object path will return mock_proxy_.
EXPECT_CALL(*mock_bus_.get(),
GetObjectProxy("org.chromium.TestService",
ObjectPath("/org/chromium/TestObject")))
.WillOnce(Return(mock_proxy_.get()));
// ShutdownAndBlock() will be called in TearDown().
EXPECT_CALL(*mock_bus_.get(), ShutdownAndBlock()).WillOnce(Return());
}
void TearDown() override { mock_bus_->ShutdownAndBlock(); }
// Called when the response is received.
void OnResponse(Response* response) {
// |response| will be deleted on exit of the function. Copy the
// payload to |response_string_|.
if (response) {
MessageReader reader(response);
ASSERT_TRUE(reader.PopString(&response_string_));
}
run_loop_->Quit();
}
protected:
std::string response_string_;
base::test::SingleThreadTaskEnvironment task_environment_;
std::unique_ptr<base::RunLoop> run_loop_;
scoped_refptr<MockBus> mock_bus_;
scoped_refptr<MockObjectProxy> mock_proxy_;
private:
// Returns a response for the given method call. Used to implement
// CallMethodAndBlock() for |mock_proxy_|.
base::expected<std::unique_ptr<Response>, Error> CreateMockProxyResponse(
MethodCall* method_call,
int timeout_ms) {
if (method_call->GetInterface() == "org.chromium.TestInterface" &&
method_call->GetMember() == "Echo") {
MessageReader reader(method_call);
std::string text_message;
if (reader.PopString(&text_message)) {
std::unique_ptr<Response> response = Response::CreateEmpty();
MessageWriter writer(response.get());
writer.AppendString(text_message);
return base::ok(std::move(response));
}
LOG(ERROR) << "Unexpected method call: " << method_call->ToString();
return base::unexpected(Error());
}
return base::unexpected(Error(DBUS_ERROR_NOT_SUPPORTED, "Not implemented"));
}
// Creates a response and posts the given response callback with the
// response. Used to implement for |mock_proxy_|.
void HandleMockProxyResponseWithMessageLoop(
MethodCall* method_call,
int timeout_ms,
ObjectProxy::ResponseCallback* response_callback) {
std::unique_ptr<Response> response =
CreateMockProxyResponse(method_call, timeout_ms).value_or(nullptr);
task_environment_.GetMainThreadTaskRunner()->PostTask(
FROM_HERE,
base::BindOnce(&MockTest::RunResponseCallback, base::Unretained(this),
std::move(*response_callback), std::move(response)));
}
// Runs the given response callback with the given response.
void RunResponseCallback(
ObjectProxy::ResponseCallback response_callback,
std::unique_ptr<Response> response) {
std::move(response_callback).Run(response.get());
}
};
// This test demonstrates how to mock a synchronous method call using the
// mock classes.
TEST_F(MockTest, CallMethodAndBlock) {
const char kHello[] = "Hello";
// Get an object proxy from the mock bus.
ObjectProxy* proxy = mock_bus_->GetObjectProxy(
"org.chromium.TestService",
ObjectPath("/org/chromium/TestObject"));
// Create a method call.
MethodCall method_call("org.chromium.TestInterface", "Echo");
MessageWriter writer(&method_call);
writer.AppendString(kHello);
// Call the method.
auto result =
proxy->CallMethodAndBlock(&method_call, ObjectProxy::TIMEOUT_USE_DEFAULT);
// Check the response.
ASSERT_TRUE(result.has_value());
MessageReader reader(result->get());
std::string text_message;
ASSERT_TRUE(reader.PopString(&text_message));
// The text message should be echo'ed back.
EXPECT_EQ(kHello, text_message);
}
TEST_F(MockTest, CallMethodAndBlockOnError) {
// Get an object proxy from the mock bus.
ObjectProxy* proxy = mock_bus_->GetObjectProxy(
"org.chromium.TestService",
ObjectPath("/org/chromium/TestObject"));
// Create a method call.
MethodCall method_call("org.chromium.TestInterface", "MissingMethod");
// Call the method.
auto result =
proxy->CallMethodAndBlock(&method_call, ObjectProxy::TIMEOUT_USE_DEFAULT);
// Check the response.
ASSERT_FALSE(result.has_value());
const Error& error = result.error();
EXPECT_EQ(DBUS_ERROR_NOT_SUPPORTED, error.name());
EXPECT_EQ("Not implemented", error.message());
}
// This test demonstrates how to mock an asynchronous method call using the
// mock classes.
TEST_F(MockTest, CallMethod) {
const char kHello[] = "hello";
// Get an object proxy from the mock bus.
ObjectProxy* proxy = mock_bus_->GetObjectProxy(
"org.chromium.TestService",
ObjectPath("/org/chromium/TestObject"));
// Create a method call.
MethodCall method_call("org.chromium.TestInterface", "Echo");
MessageWriter writer(&method_call);
writer.AppendString(kHello);
// Call the method.
run_loop_ = std::make_unique<base::RunLoop>();
proxy->CallMethod(
&method_call, ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&MockTest::OnResponse, base::Unretained(this)));
// Run the message loop to let OnResponse be called.
run_loop_->Run();
EXPECT_EQ(kHello, response_string_);
}
} // namespace dbus
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