```markdown
# Test Plan

## Target Modules
{List of modules to analyze}

## Existing Test Analysis
| Module | Existing Tests | Coverage Status |
|--------|---------------|-----------------|
| `src/xxx.ts` | `xxx.test.ts` | {Coverage status} |

## Missing Test Cases
| # | Target | Test Case | Priority | Reason |
|---|--------|-----------|----------|--------|
| 1 | `src/xxx.ts` | {Test case summary} | High/Medium/Low | {Reason} |

## Test Strategy
- {Mock approach}
- {Fixture design}
- {Test helper usage}

## Implementation Guidelines
- {Concrete instructions for the test implementer}
```