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`pipeln` implements a trivial type, `PipeListenerDialer`, that can be
used both as a `net.Listener` and as a dialer. It uses `net.Pipe` to
connect server and clients so that testing client-server communication
becomes easier.
Several dialer methods are available, and happen (as there is no
`net.Dialer` interface) to be compatible with both `net.Transport` and
`grpc.WithContextDialer`.
For instance:
```go
func TestHTTP(t *testing.T) {
ln := pipeln.New("test:80")
srv := http.Server{}
go srv.Serve(ln)
client := http.Client{Transport: &http.Transport{DialContext: ln.DialContext}}
// ...
}
func TestGRPC(t *testing.T) {
ln := pipeln.New("test")
srv := grpc.NewServer()
go srv.Serve(ln)
client, _ := grpc.Dial("test", grpc.WithContextDialer(ln.DialContextAddr), grpc.WithInsecure())
// ...
}
```
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