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claude-howto/01-slash-commands/unit-test-expand.md
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Expand Unit Tests Increase test coverage by targeting untested branches and edge cases 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