// ## Assert ##
        byte[] secondResult = cache.getContentAsBytes();
        assertArrayEquals("original".getBytes("UTF-8"), secondResult);
    }

    @Test
    public void testGetContentAsBytes_FromFile() throws IOException {
        // ## Arrange ##
        File tmpFile = File.createTempFile("cache-test-", ".tmp");
        tmpFile.deleteOnExit();
        String content = "File content here";