@Override
    public void verify(String value) {
        checkNotNull(value);

        if (!"false".equalsIgnoreCase(value) && !"true".equalsIgnoreCase(value)) {
            throw new RuntimeException("boolean attribute format is wrong.");
        }
    }
@Test
    public void testVerify_ValidValue_NoExceptionThrown() {
        booleanAttribute.verify("true");
        booleanAttribute.verify("false");
    }