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claude-howto/01-slash-commands/unit-test-expand.md
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---
name: Expand Unit Tests
description: Increase test coverage by targeting untested branches and edge cases
tags: testing, coverage, unit-tests
---
# Expand Unit Tests
Expand existing unit tests adapted to project's testing framework:
1. **Analyze coverage**: Run coverage report to identify untested branches, edge cases, and low-coverage areas
2. **Identify gaps**: Review code for logical branches, error paths, boundary conditions, null/empty inputs
3. **Write tests** using project's framework:
- Jest/Vitest/Mocha (JavaScript/TypeScript)
- pytest/unittest (Python)
- Go testing/testify (Go)
- Rust test framework (Rust)
4. **Target specific scenarios**:
- Error handling and exceptions
- Boundary values (min/max, empty, null)
- Edge cases and corner cases
- State transitions and side effects
5. **Verify improvement**: Run coverage again, confirm measurable increase
Present new test code blocks only. Follow existing test patterns and naming conventions.
---
**Last Updated**: April 9, 2026