Python Testing with pytest

Defining the Python Search Path

The Python search path is simply a list of directories Python stores in the sys.path variable. During any import statement, Python looks through the list for modules or packages matching the requested import. We can use a small test to see what sys.path looks like during a test run:

ch12/script_src/tests/test_sys_path.py

import sys


def test_sys_path():
    print("sys.path: ")
    for p in sys.path:
        print(p)

When we run it, notice the search path:

$ pytest -s tests/test_sys_path.py
========================= test session starts ==========================
collected 1 item

tests/test_sys_path.py sys.path:
/path/to/code/ch12/script_src/tests
/path/to/code/ch12/script_src/src ...