Pytest

The pytest module has the most straightforward approach to unit testing.

• If a filename starts with test_ then the file contains tests.
• If a function in such a file has a name starting with test_ then the function is a test.

• Each test function should contain one or more assertions. Pytest runs the tests and indicates any that fail such as the one below.

  # contents of test_sample.py
  def inc(x):
      return x + 1
  
  
  def test_answer():
      assert inc(3) == 5