test

Signed-off-by: shuangkun <tsk2013uestc@163.com>

workflow/controller/steps.go

@@ -489,12 +489,23 @@ func (woc *wfOperationCtx) resolveReferences(stepGroup []wfv1.WorkflowStep, scop
 		}(i, step)
 	}
 	wg.Wait()
-	if err = <-errCh; err != nil { // fetch the first error during resolveStepReferences
+
+	err = errorFromChannel(errCh)
+	if err != nil { // fetch the first error during resolveStepReferences
 		return nil, fmt.Errorf("Failed to resolve references: %s", err)
 	}
 	return newStepGroup, nil
 }
 
+func errorFromChannel(errCh <-chan error) error {
+	select {
+	case err := <-errCh:
+		return err
+	default:
+	}
+	return nil
+}
+
 // expandStepGroup looks at each step in a collection of parallel steps, and expands all steps using withItems/withParam
 func (woc *wfOperationCtx) expandStepGroup(sgNodeName string, stepGroup []wfv1.WorkflowStep, stepsCtx *stepsContext) ([]wfv1.WorkflowStep, error) {
 	newStepGroup := make([]wfv1.WorkflowStep, 0)