Structuring Test Files

Clear organization of unit tests makes your codebase easier to navigate and maintain. A common practice is to create a tests directory at the project root and place test files there. Test files are typically named with the test_ prefix and match the module they test, for example test_math_utils.py for math_utils.py.

# Example project directory structure
#
# my_project/
# ├── math_utils.py
# ├── string_utils.py
# └── tests/
#    ├── test_math_utils.py
#    └── test_string_utils.py

This structure makes tests easy to find and understand, and helps other developers review or contribute to your code. Organizing tests by module or feature also simplifies maintenance and updates as the project grows.

# Adding a new test file for a new module

# Suppose you add a new module called data_processor.py.
# Create a corresponding test file in the tests directory:

# my_project/
# ├── data_processor.py
# └── tests/
#     └── test_data_processor.py