This patch adds two fuzzing tests to the dkim package:
1) Fuzz the sign-verify cycle, checking we can verify any message we
sign.
2) Fuzz the message we verify, returning valid keys for any domain so it
gets past the key fetching, and exercises a substantial part of the
verification process.
The first test already found two issues, which were fixed in the
previous patches.
Many of our tests rely on helpers that predate features which are now
available in the standard library.
This patch replaces them with the standard equivalents:
- MustTempDir/RemoveIfOk -> t.ArtifactDir() or t.TempDir() (depending on
whether it is useful to keep the data on request).
- GetFreePort + waitForServer -> opening the listeners before starting
the servers. To support this, localrpc.Server gains a Serve method. We
may re-introduce these in the future if more use cases appear.
- WaitFor and real-time timing checks -> testing/synctest.
- context.Background() -> t.Context().
- Benchmark b.N loops -> b.Loop().
- reflect.DeepEqual -> cmp.Diff, and proto.Equal for protobufs.
This patch contains the result of running `go fix ./...`, which applies
simplifications that make use of modern language features.
There are no logic or behaviour changes.
Alberto Bertogli