// ## Arrange ##
        ContentCache cache = new ContentCache("test".getBytes());

        // ## Assert ##
        assertTrue(cache.isInMemory());
    }

    @Test
    public void testIsInMemory_WithFile() throws IOException {
        // ## Arrange ##
        File tmpFile = File.createTempFile("cache-test-", ".tmp");
        tmpFile.deleteOnExit();
        ContentCache cache = new ContentCache(tmpFile);