# Unit Testing

> Creates and runs unit tests for individual functions and modules. Use when writing or running unit tests.

- Skill: `tomevault-io/unit-testing` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/unit-testing`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/unit-testing/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/unit-testing

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# Unit Testing

Focuses on testing individual units of code in isolation.

## Instructions

When creating unit tests:

1. **Identify test cases**
   - Normal inputs and expected outputs
   - Edge cases (empty, null, boundary values)
   - Error conditions

2. **Write test structure**
   ```rust
   #[test]
   fn test_function_name_scenario() {
       // Arrange
       let input = ...;
       
       // Act
       let result = function(input);
       
       // Assert
       assert_eq!(result, expected);
   }
   ```

3. **Best practices**
   - One assertion per test when possible
   - Clear, descriptive test names
   - Test behavior, not implementation

## Examples

**Input:** Create unit tests for add function
**Output:** Tests covering positive numbers, negative numbers, zeros, and overflow cases.

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<!-- tomevault:4.0:skill_md:2026-04-13 -->