如何在JUnit中模拟Files.copy方法

import org.junit.Test;
import org.mockito.Mockito;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;

import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

public class FileCopyTest {

    @Test
    public void testFileCopy() throws IOException {
        // 创建源文件和目标文件的路径
        Path sourcePath = mock(Path.class);
        Path targetPath = mock(Path.class);

        // 创建Files.copy方法的模拟对象
        Files mockFiles = mock(Files.class);

        // 模拟Files.copy方法的行为
        when(mockFiles.copy(any(Path.class), any(Path.class), any(StandardCopyOption.class)))
                .thenReturn(targetPath);

        // 将模拟的Files对象注入到被测试的类中
        MyClass myClass = new MyClass(mockFiles);

        // 调用被测试的方法
        myClass.copyFile(sourcePath, targetPath);

        // 验证Files.copy方法是否被调用
        Mockito.verify(mockFiles).copy(sourcePath, targetPath, StandardCopyOption.REPLACE_EXISTING);
    }

    // 被测试的类
    public class MyClass {
        private Files files;

        public MyClass(Files files) {
            this.files = files;
        }

        public void copyFile(Path sourcePath, Path targetPath) throws IOException {
            files.copy(sourcePath, targetPath, StandardCopyOption.REPLACE_EXISTING);
        }
    }
}