@Nullable
	public DnsCache resolveCache() {
		return resolveCache;
	}
@Test
	void resolveCache() {
		assertThat(builder.build().resolveCache()).isNull();
		TestDnsCache resolveCache = new TestDnsCache();
		builder.resolveCache(resolveCache);
		assertThat(builder.build().resolveCache()).isEqualTo(resolveCache);
	}