Java和文件系统JUNIT集成测试

Question

我有这个类：

public class FooFileRepo {
@Override
public File getDirectory(String directoryPath) {
    ...     
    File directory = new File(directoryPath);
    ...
    return directory;
}
@Override
public void mkdirs(File f) {
    ...
    f.getParentFile().mkdirs();
}
public void writeFile(String path, String content) throws FileNotFoundException, UnsupportedEncodingException{
    ...
    try (PrintWriter writer = new PrintWriter(path, "UTF-8");) {
        writer.println(content);
    }
}   

}

如何模拟文件系统操作，以编写此类的单元测试？

谢谢。

Answer 1

使用 PowerMock

       @RunWith(PowerMockRunner.class)
       @PrepareForTest({ Printwriter.class })
       public class SampleTestClass {
        @Mock
        private PrintWriter mockPrintWriter;
        @Before
        public void init() throws Exception {
          PowerMockito.mockStatic(FileUtils.class);
        }
        @Test
        public void test() throws IOException {
        }   
       }

Answer 2

对于如此简单的测试，最好使用真实的文件系统。作为替代方案，您可以构建一个立面档案操作并轻松模拟此立面。

https://junit.org/junit4/javadoc/4.12/org/junit/rules/temporaryfolder.html

public static class HasTempFolder {
@Rule
public TemporaryFolder folder= new TemporaryFolder();
@Test
public void testUsingTempFolder() throws IOException {
  File createdFile= folder.newFile("myfile.txt");
  File createdFolder= folder.newFolder("subfolder");
  // ...
 }
}

还请阅读以下答案：https：//stackoverflow.com/a/17164103/516167