def METHOD_NAME():
    assert validate_is_int('2')
    assert validate_is_int('6')
    assert validate_is_int('-1')
    assert validate_is_int('500')
    assert not validate_is_int('2.0')
    assert not validate_is_int('2.1')
    assert not validate_is_int('-2.1')
    assert not validate_is_int('-ee')