@Test
void applyLeavesHeadersUntouched() {

    final HeaderFilter unit = removeHeaders((name, value) ->
            "Set-Cookie".equals(name) && "version=2".equals(value));
    final HttpHeaders headers = HttpHeaders.of(
            "Set-Cookie", "version=1", "user=me");
    final HttpHeaders actual = unit.filter(headers);
    assertSame(headers, actual);
}