assertTrue(thumbnailGenerator.generate(thumbnailId, outputFile));
            assertTrue(outputFile.exists());
        }
    }

    public void test_isTarget_withVariousMimeTypes() {
        // Test with various MIME types
        String[] supportedTypes = { "application/pdf", "image/jpeg", "image/png" };
        String[] unsupportedTypes = { "text/plain", "application/xml", "audio/mp3" };