Question

所以我正在研究一些代码来帮助探索集合论。我也用py.test测试这个代码，我仍然相对缺乏经验（这也是我使用它的原因之一）。

所以现在我正在研究关系，我有所有这些关系从一个抽象关系类中继承（例如ReflexiveRelation，CommutativeRelation，TransitiveRelation等）。其中许多关系都有类似的测试，如下所示。我想强调这一点，这样我每次添加新关系时都不必重复这个过程。由于这种草率的安排，我已经遇到了错误。

我已经考虑了一些不同的方法，但是我不完全确定它们是否与py.test架构紧密相关。我想知道一个更有经验的py.test用户是否能够提供一些关于此的智慧的话（或者至少指向正确的手册阅读）。

class TestRelation:
    __testing__ = "Relation"

    def test_abstactness(self):
        with pytest.raises(TypeError):
            relation.Relation(np.equal, '=')

class TestReflexiveRelation(TestRelation):
    def test_set_creation(self):
        with pytest.raises(relation.FalseRelationError) as fre:
            relation.ReflexiveSet(1)
        assert fre.value.message == "Relation must be a ReflexiveRelation"

    def test_subclassing(self):
        assert issubclass(relation.ReflexiveRelation, relation.Relation),\
            "ReflexiveRelation should be a subclass of Relation. It is not."

class TestCommutativeRelation:
    def test_set_creation(self):
        with pytest.raises(relation.FalseRelationError) as fre:
            relation.CommutativeSet(1)
        assert fre.value.message == "Relation must be a CommutativeRelation"

    def test_subclassing(self):
        assert issubclass(relation.CommutativeRelation, relation.Relation),\
            "ReflexiveRelation should be a subclass of Relation. It is not."

Answer 1

我认为这些参数化灯具就是答案。谢谢@jme！

 test_relations = [
        (relation.ReflexiveRelation, relation.ReflexiveSet),
        (relation.TransitiveRelation, relation.TransitiveSet),
        (relation.CommutativeRelation, relation.CommutativeSet)
    ]

    class TestRelation:
        __testing__ = "Relation"

        def test_abstactness(self):
            with pytest.raises(TypeError):
                relation.Relation(np.equal, '=')

        @pytest.mark.parametrize("ARelation, ASet", test_relations)
        def test_incorrect_set_creation(self, ARelation, ASet):
            with pytest.raises(relation.FalseRelationError) as fre: 
                ASet(1)
            assert fre.value.message == "Relation must be a " + ARelation.__name__

关于干这个的建议？

1 个答案: