fix(pkg/sshd/common_test.go): increase verbosity of WaitGroup timeout errors

Author: Aaron Schlesinger

pkg/sshd/common_test.go

@@ -1,14 +1,18 @@
 package sshd
 
 import (
-	"errors"
+	"fmt"
 	"sync"
 	"time"
 )
 
-var (
-	errWGTimedOut = errors.New("waitgroup wait timed out")
-)
+type errWGTimedOut struct {
+	to time.Duration
+}
+
+func (e errWGTimedOut) Error() string {
+	return fmt.Sprintf("WaitGroup wait timed out after %s", e.to)
+}
 
 // waitWithTimeout waits for wg.Done() until timeout expires. returns errWGTimedOut if timeout expired before wg.Done() returned, otherwise returns nil. this func is naturally leaky if wg.Done() never returns
 func waitWithTimeout(wg *sync.WaitGroup, timeout time.Duration) error {
@@ -19,7 +23,7 @@ func waitWithTimeout(wg *sync.WaitGroup, timeout time.Duration) error {
 	}()
 	select {
 	case <-time.After(timeout):
-		return errWGTimedOut
+		return errWGTimedOut{to: timeout}
 	case <-ch:
 		return nil
 	}