@Nullable
	public HostsFileEntriesResolver hostsFileEntriesResolver() {
		return hostsFileEntriesResolver;
	}
@Test
	void hostsFileEntriesResolverBadValues() {
		assertThatExceptionOfType(NullPointerException.class)
				.isThrownBy(() -> builder.hostsFileEntriesResolver(null));
	}