pytest

• Última modificación: Mayo 14, 2022

Ejemplo básico

%%writefile test_sample.py
def func(x):
    return x + 1


def test_answer():
    assert func(3) == 5

Writing test_sample.py

!pytest

============================= test session starts ==============================
platform linux -- Python 3.8.10, pytest-7.1.2, pluggy-1.0.0
rootdir: /workspace/pytest
plugins: anyio-3.5.0
collected 1 item

test_sample.py F                                                         [100%]

=================================== FAILURES ===================================
_________________________________ test_answer __________________________________

    def test_answer():
>       assert func(3) == 5
E       assert 4 == 5
E        +  where 4 = func(3)

test_sample.py:6: AssertionError
=========================== short test summary info ============================
FAILED test_sample.py::test_answer - assert 4 == 5
============================== 1 failed in 0.10s ===============================

Chequeo de una excepción

%%writefile test_sysexit.py
import pytest


def f():
    raise SystemExit(1)


def test_mytest():
    with pytest.raises(SystemExit):
        f()

Writing test_sysexit.py

!pytest -q test_sysexit.py

.                                                                        [100%]
1 passed in 0.01s

Multiples tests en una clase

%%writefile test_class.py
class TestClass:
    def test_one(self):
        x = "this"
        assert "h" in x

    def test_two(self):
        x = "hello"
        assert hasattr(x, "check")

Writing test_class.py

!pytest -q test_class.py

.F                                                                       [100%]
=================================== FAILURES ===================================
______________________________ TestClass.test_two ______________________________

self = <test_class.TestClass object at 0x7f3afd8c0fa0>

    def test_two(self):
        x = "hello"
>       assert hasattr(x, "check")
E       AssertionError: assert False
E        +  where False = hasattr('hello', 'check')

test_class.py:8: AssertionError
=========================== short test summary info ============================
FAILED test_class.py::TestClass::test_two - AssertionError: assert False
1 failed, 1 passed in 0.06s

%%writefile test_class_demo.py
class TestClassDemoInstance:
    def test_one(self):
        assert 0

    def test_two(self):
        assert 0

Writing test_class_demo.py

!pytest -k TestClassDemoInstance -q

FF                                                                       [100%]
=================================== FAILURES ===================================
________________________ TestClassDemoInstance.test_one ________________________

self = <test_class_demo.TestClassDemoInstance object at 0x7f69f3d27370>

    def test_one(self):
>       assert 0
E       assert 0

test_class_demo.py:3: AssertionError
________________________ TestClassDemoInstance.test_two ________________________

self = <test_class_demo.TestClassDemoInstance object at 0x7f69f3d27310>

    def test_two(self):
>       assert 0
E       assert 0

test_class_demo.py:6: AssertionError
=========================== short test summary info ============================
FAILED test_class_demo.py::TestClassDemoInstance::test_one - assert 0
FAILED test_class_demo.py::TestClassDemoInstance::test_two - assert 0
2 failed, 4 deselected in 0.08s