unit-test

name	unit-test
description	Unit testing techniques, mocking, and assertions

Unit Test Skill

This skill focuses on writing fast, isolated tests for individual units of code (functions, methods, classes).

When to use this skill

• When writing tests for utility functions, algorithms, or standalone classes.
• When using tools like Jest, pytest, JUnit, or xUnit.
• When needing to mock out dependencies (databases, APIs, file systems).

Guidelines

• Isolation: A unit test should not rely on an external database or network. Use mocks or stubs instead.
• Naming: Use clear, descriptive names (e.g., calculateTotal_withValidInput_returnsCorrectSum).
• Structure: Use the Arrange-Act-Assert (AAA) pattern.
• Speed: Unit tests must be fast so developers can run them frequently.