Python Testing with pytest

Exercises

Reaching for builtin fixtures whenever possible is a great way to simplify your own test code. The exercises below are designed to give you experience using tmp_path and monkeypatch, two super handy and common builtin fixtures.

Take a look at this script that writes to a file:

ch4/hello_world.py

def hello():
    with open("hello.txt", "w") as f:
        f.write("Hello World!\n")


if __name__ == "__main__":
    hello()

1. Write a test without fixtures that validates that hello() writes the correct content to hello.txt.

2. Write a second test using fixtures that utilizes a temporary directory and monkeypatch.chdir().

3. Add a print statement to see where the temporary directory is located. Manually check the hello.txt file after ...