t.Fatalf("Output didn't match for '%s %s'\n got %v\nwant: %v", cmd.Name(),
			strings.Join(c.Args, " "), output, c.ExpectedRegexp)
	}

	if c.GoldenFilename != "" {
		util.CompareContent(t, []byte(output), c.GoldenFilename)
	}

	if c.WantException {
		if fErr == nil {
			t.Fatalf("Wanted an exception for 'istioctl %s', didn't get one, output was %q",
				strings.Join(c.Args, " "), output)
		}