Python Testing with pytest

Using assert Statements

When you write test functions, the normal Python assert statement is your primary tool to communicate test failure. The simplicity of this within pytest is brilliant. It’s what drives a lot of developers to use pytest over other frameworks.

If you’ve used any other testing framework, you’ve probably seen various assert helper functions. For example, the following is a list of a few of the assert forms and assert helper functions:

pytest	unittest
assert something	assertTrue(something)
assert a == b	assertEqual(a, b)
assert a <= b	assertLessEqual(a, b)
…	…

With pytest, you can use assert <expression> with any expression. If the expression would evaluate to False if converted to a bool, the test would fail.

pytest includes a feature ...