pytest xfail參數詳解

源碼使用說明
```
    def xfail(self,condition=None, reason=None, raises=None, run=True, strict=False):
        """mark the the test function as an expected failure if eval(self,condition)
        has a True value.

        Optionally specify a reason for better reporting and run=False if
        you don't even want to execute the test function.

        See http://doc.pytest.org/en/latest/skipping.html
        """
```

1. 直接使用@pytest.mark.xfail

@pytest.mark.xfail
def test_01():
    assert 1 == 1


@pytest.mark.xfail
def test_02():
    assert 1 == 2

運行結果為

 

 使用xfail標記用例預期失敗，如果用例運行成功則顯示Xpassed，失敗則顯示xfailed。xfail標記並不會影響用例的運行

2.strict參數 ：設置strict=True以確保XPASS時，測試的記錄為失敗

同樣使用該代碼

@pytest.mark.xfail(strict=True)
def test_01():
    assert 1 == 1


@pytest.mark.xfail
def test_02():
    assert 1 == 2

運行結果

 

 xpass運行的結果現在顯示為failed

3，結合skipif 條件，條件為Ture運行xfail

@pytest.mark.xfail(1 >= 5, reason='test')
def test_01():
    assert 1 == 1

@pytest.mark.xfail(1 >= 5, reason='test')
def test_02():
    assert 1 == 5


@pytest.mark.xfail(1 <= 5, reason='test')
def test_03():
    assert 1 == 1


@pytest.mark.xfail(1 <= 5, reason='test')
def test_04():
    assert 1 == 2

運行結果

 

 用例01、02，因為條件為false所以不運行xfail，結果顯示為pass、fail

03、04條件為true，運行xfail，結果顯示為xpass、xfail

4raises參數

具體的說明測試失敗的原因。可以在raises參數中指定單個異常或異常組，如果測試失敗且沒有提到指定的異常，那么測試將被報告為常規失敗raises

@pytest.mark.xfail(raises=AssertionError)
def test_01():
    assert 1 == 2


@pytest.mark.xfail(raises=ValueError)
def test_02():
    if isinstance('1234', int) is not True:
        raise TypeError("傳入參數非整數")

運行結果：

 

 01測試用例，異常為指定異常，xfail運行，結果顯示xfailed

02測試用例，異常為非指定異常，xfail不運行，結果顯示failed