PyTest using classes

---

examples/pytest/test_with_class.py

class TestClass():
    def test_one(self):
        print("one")
        assert True
        print("one after")

    def test_two(self):
        print("two")
        assert False
        print("two after")

class TestBad():
    def test_three(self):
        print("three")
        assert False
        print("three after")

============================= test session starts ==============================
platform linux -- Python 3.8.6, pytest-6.1.2, py-1.9.0, pluggy-0.13.1
rootdir: /home/gabor/work/slides/python/examples/pytest
plugins: flake8-1.0.6, dash-1.17.0
collected 3 items

test_with_class.py .FF                                                   [100%]

=================================== FAILURES ===================================
______________________________ TestClass.test_two ______________________________

self = <test_with_class.TestClass object at 0x7fac08abdbe0>

    def test_two(self):
        print("two")
>       assert False
E       assert False

test_with_class.py:9: AssertionError
----------------------------- Captured stdout call -----------------------------
two
______________________________ TestBad.test_three ______________________________

self = <test_with_class.TestBad object at 0x7fac08a606a0>

    def test_three(self):
        print("three")
>       assert False
E       assert False

test_with_class.py:15: AssertionError
----------------------------- Captured stdout call -----------------------------
three
=========================== short test summary info ============================
FAILED test_with_class.py::TestClass::test_two - assert False
FAILED test_with_class.py::TestBad::test_three - assert False
========================= 2 failed, 1 passed in 0.03s ==========================