    @Test
    public void isInvalidWithNotBlank() throws Exception {

        assertNotEmpty("is invalid with String", new BlankConstraint(NOT_BLANK, PROPERTY_NAME).validate());

        assertNotEmpty("is invalid with EditText",
            new BlankConstraint(generateEditText(NOT_BLANK), PROPERTY_NAME).validate());

        assertNotEmpty("is invalid with Spinner",
            new BlankConstraint(generateSpinner(NOT_BLANK), PROPERTY_NAME).validate());
    }