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TLS ​

m.MustStartTLS() serves gRPC over TLS, with a self-signed certificate for localhost, 127.0.0.1 and ::1, and m.Dial() already trusts it:

go
m := mockgrpc.MustNew()
m.MustStartTLS()
t.Cleanup(m.Close)

client := pb.NewUsersClient(m.MustDial())

m.Certificate() returns the certificate for clients of your own to trust. Credentials ServerOptions set with grpc.Creds win over these: StartTLS then serves them as Start does, m.Certificate() returns nil, and m.Dial() needs grpc.WithTransportCredentials.

Certificates of your own, mutual TLS and the CLI's --grpc-tls are on the TLS page, for HTTP and gRPC alike.