// Check that a range loop, len([]rune(string)) optimization and
// []rune conversions visit the same runes.
// Not really a test of this package, but the assumption is used here and
// it's good to verify.
func TestRuntimeConversion(t *testing.T) {
	for _, ts := range testStrings {
		count := RuneCountInString(ts)
		if n := runtimeRuneCount(ts); n != count {