Deleting File and Directory in JUnit

Question

I\'m writing a test for a method that creates a file in a directory. Here\'s what my JUnit test looks like:

  @Before
  public void setUp(){
      objectUnderTes         


        

Answer 1

Use the @Rule annotation and the TemporaryFolder classfor the folder that you need to delete.

http://kentbeck.github.com/junit/javadoc/4.10/org/junit/Rule.html (404 not found)

Update example of usage by http://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");
    // ...
  }

}

Answer 2

I think the best approche is te delete after JVM exit :

Path tmp = Files.createTempDirectory(null);
tmp.toFile().deleteOnExit();

Answer 3

Ensure that the method objectUnderTest.createFile(nameOfFile, textToWrite) actually closes any opened streams?

Answer 4

This is how I usually clean up files:

@AfterClass
public static void clean() {
    File dir = new File(DIR_PATH);
    for (File file:dir.listFiles()) {
        file.delete();
    }
    dir.delete();
}

Your directory must be empty in order to delete it, make sure no other test methods are creating more files there.

Ensure you are closing the FileWriter instance in a finally block.