t.Helper()

	if c.expectedString != "" && !strings.Contains(output, c.expectedString) {
		t.Fatalf("Output didn't match for 'istioctl %s'\n got %v\nwant: %v", c.args, output, c.expectedString)
	}

	if c.notExpected != "" && strings.Contains(output, c.notExpected) {
		t.Fatalf("Output didn't match for 'istioctl %s'\n got %v\nDON'T want: %v", c.args, output, c.expectedString)
	}

	if c.shouldFail {