JUnit test zipping of folder

Question

I have implemented a method to zip files. This method is capable of zipping subfolder, overwriting existing zip files and some more. Now I want to create unit tests for this method. I started with a default zip-file with some content so I could test the overwriting etc.

My method to set up the source files:

@Before
public void setUp() throws IOException, URISyntaxException {

    util = new ZipFileUtil();

    parent = folder.newFolder("Parent");
    File subfolder = folder.newFolder("Parent", "Subfolder");
    File sub2 = folder.newFolder("Parent", "Subfolder", "Sub2");

    File f1 = File.createTempFile("file1", ".txt", parent);
    File f2 = File.createTempFile("file2", ".txt", parent);
    File f3 = File.createTempFile("file3", ".txt", parent);

    File f4 = File.createTempFile("file4", ".txt", subfolder);
    File f5 = File.createTempFile("file5", ".txt", subfolder);

    File f6 = File.createTempFile("file6", ".txt", sub2);
    File f7 = File.createTempFile("file7", ".txt", sub2);

    File f8 = File.createTempFile("test", ".txt", sub2);

    File f9 = File.createTempFile("test1", ".txt", parent);

    files[0] = f1;
    files[1] = f2;
    files[2] = f3;
    files[3] = f4;
    files[4] = f5;
    files[5] = f6;
    files[6] = f7;
    files[7] = f8;
    files[8] = f9;

    File file = new File(getClass().getClassLoader().getResource("test.zip").toURI());

    Files.copy(file.toPath(), Paths.get(folder.getRoot().toString(), "test.zip"),
            StandardCopyOption.REPLACE_EXISTING);
}

And my test:

@Test
public void testOverwriteFilesInExistingZip() throws IOException {
    util.setZipNameGenerator(new ZipNamingStrategy() {

        @Override
        public String getName() {
            // TODO Auto-generated method stub
            return "test";
        }

    });
    util.setOverwriteFilesInExistingZip(true);
    util.setSourceFolder(parent);
    util.setDestinationFolder(folder.getRoot());
    util.generateZip(new FilenameFilter() {

        @Override
        public boolean accept(File dir, String name) {
            return true;

        }
    });
    FileSystem fs = FileSystems.newFileSystem(Paths.get(folder.getRoot().getAbsolutePath(), "test.zip"), null);

    assertEquals("/" + files[0].getName(),
            fs.getPath("/", parent.toPath().relativize(files[0].toPath()).toString()).toString());
    assertEquals("/" + files[1].getName(),
            fs.getPath("/", parent.toPath().relativize(files[1].toPath()).toString()).toString());
    assertEquals("/" + files[2].getName(),
            fs.getPath("/", parent.toPath().relativize(files[2].toPath()).toString()).toString());
    assertEquals(true,
            new File(fs.getPath("/", parent.toPath().relativize(files[8].toPath()).toString()).toString()).exists());

    assertEquals("/file.txt", fs.getPath("/", "file.txt").toString());
    assertEquals("/New Text Document.txt", fs.getPath("/", "New Text Document.txt").toString());
    assertEquals("/test.txt", fs.getPath("/", "test.txt").toString());
    assertEquals("/test1.txt", fs.getPath("/", "test1.txt").toString());

    assertEquals("/Subfolder/file.txt", fs.getPath("/", "test1.txt").toString());
    assertEquals("/Subfolder/desktop.ini", fs.getPath("/", "test1.txt").toString());
    assertEquals("/Subfolder/test.txt", fs.getPath("/", "test1.txt").toString());
    assertEquals("/Subfolder/New Text Document.txt", fs.getPath("/", "test1.txt").toString());

    assertEquals(15, util.getProcessedFiles());

}

I am kinda lost on how to properly check if the zip file has the right structure (files have to exist in the file). Currently I am just checking the paths, but this is so wrong and I know it. Can anyone enlighten me on how to properly test this kind of method?

Answer 1

If you want to check whether these files exist within the zip file, you can use Files.exist(path).

If you want to go further and check the actual content, you can either unzip into a different temporary directory, or ask Java to read directly from the zip file.