Unit-testing with dependencies between tests

Question

How do you do unit testing when you have

• some general unit tests
• more sophisticated tests checking edge cases, depending on the general ones

Answer 1

You may want use pytest-dependency. According to theirs documentation code looks elegant:

import pytest

@pytest.mark.dependency()
@pytest.mark.xfail(reason="deliberate fail")
def test_a():
    assert False

@pytest.mark.dependency()
def test_b():
    pass

@pytest.mark.dependency(depends=["test_a"])
def test_c():
    pass

@pytest.mark.dependency(depends=["test_b"])
def test_d():
    pass

@pytest.mark.dependency(depends=["test_b", "test_c"])
def test_e():
    pass

Please note, it is plugin for pytest, not unittest which is part of python itself. So, you need 2 more dependencies (f.e. add into requirements.txt):

pytest==5.1.1
pytest-dependency==0.4.0