I'm trying to write unit tests for a method that takes a String filename, then opens the file and reads from it. So, to test that method, I thought about writing a file, then calling my method. However, in the build farm, it is not possible to write files arbitrarily to disk. Is there a standard way to "simulate" having a real file in my unit test?
4 Answers
If you use JUnit, there is the TemporaryFolder. Files are deleted after the test. Example given on the page:
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");
// ...
}
}
However, I have also used it for testing my Android class read/write capabilities like:
[...]
pw = new PrintWriter(folder.getAbsolutePath() + '/' + filename);
pw.println(data);
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