    @Test public void parseCacheHeaders_headersSet() {

        headers.put("MyCustomHeader", "42");
        NetworkResponse response = new NetworkResponse(0, new byte[0], Headers.of(headers), 0);
        Cache.Entry entry = HttpHeaderParser.parseCacheHeaders(response);
        assertNotNull(entry);
        assertNotNull(entry.responseHeaders);
        assertEquals(1, entry.responseHeaders.size());
        assertEquals("42", entry.responseHeaders.get("MyCustomHeader"));
    }