If you want to enter debugging when running pytest in VSCode and stay at a line of code, you could click ‘Debug Test‘ at the top of the method after selecting the pytest test, as shown in the screenshot: In addition, “python.testing.pytestArgs”: [], in .vscode\settings.json is the folder path of the tested file, for example, … Read more
pytest provides a fixture for this use-case: monkeypatch.syspath_prepend. You may prepend a path to sys.path list of import locations. Write a fake fwlib.py and include it in your tests, appending the directory as necessary. Like the other test modules, it needn’t be included with the distribution. After playing with this myself, I couldn’t actually figure … Read more
JUnit assertEquals(expected, actual) Pytest (Pycharm) Comments have implied this may be more an issue with the way PyCharm displays the message than pytest itself – ie. this message may not exist outside of PyCharm… assert actual == expected For example: def test_actual_expected(): expected = 4 actual = 2+1 assert actual == expected Will fail with … Read more
i’ve used Django test for my entire life and now i am using Py.test. I agree that pytest is much cleaner than django itself. The benefit from pytest is fixture in another file. It makes my test case compact by let them be my input parameters. In Django unittest you can still use fixtures in … Read more
There is a py.test plugin, pytest-pycharm, that will halt the PyCharm debugger when a test emits an uncaught exception.
For pytest >= 7.0 The doc now explicitely mentions this case should be solved this way (without pytest): with warnings.catch_warnings(): warnings.simplefilter(“error”) … though this may not completely solve some cases (dynamic checks: see this post). The solution suggested for pytest < 7.0, below, now raises a DeprecationWarning. Thanks to @Warren-Weckesser for signaling this in comment! … Read more
I like the general “test-step” idea. I’d term it as “incremental” testing and it makes most sense in functional testing scenarios IMHO. Here is a an implementation that doesn’t depend on internal details of pytest (except for the official hook extensions). Copy this into your conftest.py: import pytest def pytest_runtest_makereport(item, call): if “incremental” in item.keywords: … Read more
There is the tmpdir fixture which will create you a per-test temporary directory. So a test would look something like this: def writetoafile(fname): with open(fname, ‘w’) as fp: fp.write(‘Hello\n’) def test_writetofile(tmpdir): file = tmpdir.join(‘output.txt’) writetoafile(file.strpath) # or use str(file) assert file.read() == ‘Hello\n’ Here you’re refactoring the code to not be hardcoded either, which is … Read more
Both Pytest Fixtures and regular functions can be used to structure to test code and reduce code duplication. The answer provided by George Udosen does an excellent job explaining that. However, the OP specifically asked about the differences between a pytest.fixture and a regular Python function and there is a number of differences: Pytest Fixtures … Read more
Yes, it is possible. If you have the test and all the fixtures in 1 file: test.py import pytest @pytest.fixture def foo(): return “foo” @pytest.fixture def bar(foo): return foo, “bar” def test_foo_bar(bar): expected = (“foo”, “bar”) assert bar == expected and run pytest test.py then Success!!! ======================================= test session starts ======================================== platform darwin — Python … Read more