def METHOD_NAME(self):
    with open(self.FILE, "rb") as handle:
        testdata = handle.read()
    # Create test file
    testfile = os.path.join(self.tempdir, os.path.basename(self.FILE))
    # Write test data to file
    with open(testfile, "wb") as handle:
        handle.write(testdata)
    # Parse test file
    storage = self.FORMAT(
        testfile,
        template_store=self.FORMAT(testfile, is_template=True),
        existing_units=[
            MockUnit(
                source="Orangutan has five bananas.",
                target="Orangutan má pět banánů.",
            )
        ],
    )
    # Save test file
    storage.save()
    # Read new content
    with open(testfile) as handle:
        newdata = handle.read()
    self.assertEqual(
        newdata,
        """# Ahoj světe!