tempFile = File.createTempFile("test", ".tmp", Curl.tmpDir);
        ContentCache cache = new ContentCache(tempFile);

        assertNotNull(cache);
    }

    @Test
    public void testFileBasedCacheConstructorWithNull() {
        try {
            new ContentCache((File) null);
            fail("Expected IllegalArgumentException");
        } catch (IllegalArgumentException e) {