Add additional check for io noop

Signed-off-by: Devanshu <[email protected]>

Author: devanshuVmware

cli/pkg/kctrl/cmd/app/release/release_cmd_runner_test.go

@@ -1,16 +1,21 @@
 package release
 
 import (
-	"os"
+	"bytes"
 	"os/exec"
 	"testing"
 
 	"github.com/stretchr/testify/require"
 )
 
 func TestReleaseCmdRunnerForKappCmd(t *testing.T) {
-	ReleaseCmdRunner := NewReleaseCmdRunner(os.Stdout, false, "", false, nil)
+	var buf bytes.Buffer
+	ReleaseCmdRunner := NewReleaseCmdRunner(&buf, false, "", false, nil)
 	cmd := exec.Command("kapp", "deploy", "-f", "-", "-a", "pkg-test", "-y")
 	err := ReleaseCmdRunner.RunWithCancel(cmd, nil)
 	require.NoError(t, err)
+	expectedLength := 0
+	if actualLength := buf.Len(); actualLength != expectedLength {
+		t.Errorf("Got Buffer length = %d, Expected empty", actualLength)
+	}
 }