service

举个例子：
@Nullable public static String getString(@NonNull Intent intent, @NonNull String key, @Nullable String defaultValue) { return getString(intent.getExtras(), key, defaultValue); }
getString的已经有了defaultValue，然而还是Nullable，整个方法返回的也是Nullable，那么这个默认值感觉没有什么意义，也没有节省任何非空的判断

Summary

This is the main tracking issue for Naming Providers support. Naming providers can be either DNS - for use with DNSLink - or even naming services such as ENS and IPNS.

Ideally even doing things like detecting the provider from the domain name and doing the right thing.

Status

The question came from gitter: https://gitter.im/ng-mocks/community?at=6128e79d4c7be06b7986702b

Hi guys.
I'm trying to test a route resolver and everything seems to be working fine for the successful resolve, but for unsuccessful resolves, I redirect the user to a different route using

            return from(
                this.router.navigate(['app/maintenance'], { state: { tab }