Pytest

Injecting modules into tests with Pytest

There is a known slightly boring problem with tests. You have conftest.py, which is magical and is always available in tests (but only via hooks and fixtures, and double-magical ‘request’ metafunc). If you want to have it outside fixtures, things become…

In-module tests with imports

There is a nice pattern for a scripts: you write their tests right in the script. It’s allow to bypass any import issues and just ship code and tests together.

This approach works perfectly if you have only simple tests:

Concise use of class-scoped fixtures

How to use class-scoped fixtures only for a single class without specifying it in each test method signature

I run ansible to run ansible to make ansible runnable on remote host

Higher order generic inventories…

Fixture factory for conciseness

My most beloved pattern for testinfra

When you have a lot of tests, the last thing you want is to copy-paste non-trivial code again and again.

How to get directory with test from fixture in conftest.py

When I put my fixtures into conftest.py (which is the preferable way to reuse fixtures within a project), I stumble on one minor issue, is that fixture can’t use __file__ anymore to find directory where file is present.

How to create a nice id for parameter in parametrized tests in pytest

There was an inconvenience which bothered me for a long time. When you have some crazy parametrization (two fixtures, content of two different files), parameter name (ids for parameter application) are usually…

pytest.fail in a fixture and in a test

A subtle difference between ERROR and FAIL

I found one amazing property of the pytest recently. If you call pytest.fail inside a test, it’s a FAIL status for that test (or XFAIL, if it has xfail mark).

yielding closure from a fixture in pytest

There is a pattern I occasionally see. There is a fixture, which need to do something in the middle of the test. It’s a fixture because it has dependency on other fixtures (in my case host magical fixture of testinfra), and it need to do cleanup after test…