def test_serializes_output_boolean():
    assert GraphQLBoolean.serialize('string') is True
    assert GraphQLBoolean.serialize('') is False
    assert GraphQLBoolean.serialize(1) is True
    assert GraphQLBoolean.serialize(0) is False
    assert GraphQLBoolean.serialize(True) is True
    assert GraphQLBoolean.serialize(False) is False
def test_serializes_output_boolean():
    assert GraphQLBoolean.serialize('string') is True
    assert GraphQLBoolean.serialize('') is False
    assert GraphQLBoolean.serialize(1) is True
    assert GraphQLBoolean.serialize(0) is False
    assert GraphQLBoolean.serialize(True) is True
    assert GraphQLBoolean.serialize(False) is False