如何使用GMock模拟OpenCV摄像头，或者如何测试使用GTest摄像头的方法？

class Camera {
public:
    virtual bool openCamera() = 0;
    virtual bool captureImage(cv::Mat& image) = 0;
    virtual void closeCamera() = 0;
};

#include <gmock/gmock.h>

class MockCamera : public Camera {
public:
    MOCK_METHOD(bool, openCamera, (), (override));
    MOCK_METHOD(bool, captureImage, (cv::Mat& image), (override));
    MOCK_METHOD(void, closeCamera, (), (override));
};

#include <gtest/gtest.h>
#include <gmock/gmock.h>

// ...

TEST(CameraTest, CaptureImageTest) {
    MockCamera camera;  // 创建模拟摄像头对象

    // 设置模拟函数的行为
    cv::Mat dummyImage(640, 480, CV_8UC3);
    EXPECT_CALL(camera, openCamera()).WillOnce(testing::Return(true));
    EXPECT_CALL(camera, captureImage(testing::_))
        .WillOnce(testing::DoAll(testing::SetArgReferee<0>(dummyImage), testing::Return(true)));
    EXPECT_CALL(camera, closeCamera());

    // 调用被测试的摄像头相关方法
    // ...

    // 验证摄像头方法是否按照预期执行
    // ...
}