err = hs.pickCipherSuite()
		}
	}
	s.Close()
	t.Helper()
	if len(expectedSubStr) == 0 {
		if err != nil && err != io.EOF {
			t.Errorf("Got error: %s; expected to succeed", err)
		}
	} else if err == nil || !strings.Contains(err.Error(), expectedSubStr) {
		t.Errorf("Got error: %v; expected to match substring '%s'", err, expectedSubStr)
	}
}

func TestSimpleError(t *testing.T) {