reading-notes

In Class Notes: Testing and Modules

• pip install pytest inside the virtual environment
  • This keeps the package confined to the specific program you are working on
• Need to create a test folder and a test_<module-name>.py file

Process

• Create project
• Activate virtual environment
• Create tests folder
• Create a test_<module-name>.py file for each test you want to build
• We will start by writing a test for the program based on our desired outputs
  • NOTE: tests must begin with test_<test-name>():
• Import pytest into test_<module-name>.py file import pytest
• Create a __init__.py file within the tests folder in order for tests to initialization
• Install pytest-watch
  • This library always watches for changes inside the test file
  • This will let you know if your test begin to fail due to errors you just made
• Import the desired functions to test into the appropriate test module
  • from <module-name> import <function-name>
• Can skip tests by placing @pytest.mark.skip() on the line proceeding the function you want to skip
• NOTE: When you first run a test it will fail because you have not yet built the function

• Test Structure

  def test_fiz_buzz_7():
    actual = fizz_buzz(7)
    expected = "Fizz"
    assert actual ==  expected
  

  • Actual says, “here’s the actual value returned by the function”
  • Expected says, “here’s the value I expect the function to return”
  • Assert says, “these two things are equal”
    • If they are the same, test passes
    • If they are different, the test fails