Testing

# Testing: Get-PRChecks.ps1 Skill

## Test Results (2025-12-28)

- **Tests**: 30/30 passed
- **Execution Time**: 27.38s
- **Framework**: Pester 5.7.1

## Coverage Analysis

### Feature Areas Tested

| Area | Tests | Coverage |
|------|-------|----------|
| Parameter validation | 6 | Complete |
| SUCCESS states | 3 | Complete (SUCCESS, NEUTRAL, SKIPPED) |
| FAILURE states | 4 | Complete (FAILURE, CANCELLED, TIMED_OUT, ACTION_REQUIRED) |
| PENDING states | 3 | Complete (QUEUED, IN_PROGRESS, WAITING) |
| Legacy StatusContext | 4 | Complete |
| Edge cases | 3 | Complete (no commits, null rollup, empty contexts) |
| RequiredOnly filtering | 2 | Complete |
| Output structure | 4 | Complete |

### Known Coverage Gaps

1. **Exit codes 2, 3, 7**: Error and timeout exit codes not tested (GraphQL mock limitation)
2. **Wait/polling logic**: Timeout behavior not exercised (timing complexity)
3. **Pagination (>100 checks)**: Edge case untested

## Testing Insights

### Mock Design Pattern

Helper function `New-MockGraphQLResponse` provides flexible test data generation:

```powershell
function New-MockGraphQLResponse {
    param(
        [int]$Number = 50,
        [string]$OverallState = 'SUCCESS',
        [array]$CheckRuns = @(),
        [array]$StatusContexts = @(),
        [switch]$NoPR,
        [switch]$NoCommits,
        [switch]$NoRollup
    )
    # Returns structured GraphQL response hashtable
}
```

Benefits:
- Parameterized edge case generation (NoPR, NoCommits, NoRollup switches)
- Supports both CheckRun and StatusContext types
- Easily extended for new test scenarios

### Test Execution Performance

Individual test times:
- Parameter validation: 3-78ms (fast)
- State classification: 900ms-2.1s (script loading overhead)

Performance factor: Tests dot-source script (`. $Script:ScriptPath`) for each scenario, adding 900ms+ overhead per test.

Optimization opportunity: Cache script loading in BeforeAll (would reduce 27s to <10s).

### Function Testing Approach

Tests directly invoke internal functions after dot-sourcing:

```powershell
. $Script:ScriptPath -PullRequest 1 -ErrorAction SilentlyContinue 2>$null
$result = Get-ChecksFromResponse -Response $mockResponse
```

This provides unit-level isolation for helper functions (Get-ChecksFromResponse, Build-Output, ConvertTo-CheckInfo).

## Recommendations for Future Skill Tests

1. **Add integration test tier**: One real API test per skill for exit code validation
2. **Document coverage gaps**: Explicitly note mock limitations in test file comments
3. **Performance consideration**: Cache script loading when testing multiple scenarios
4. **Negative parameter tests**: Validate invalid parameter combinations fail correctly

## Exit Code Verification

| Code | Meaning | Validation Status |
|------|---------|-------------------|
| 0 | All passing/pending | Implicit in SUCCESS tests |
| 1 | Checks failed | Implicit in FAILURE tests |
| 2 | PR not found | Not tested (mock limitation) |
| 3 | API error | Not tested (mock limitation) |
| 7 | Timeout | Not tested (polling complexity) |

## Quality Assessment

**Overall**: High confidence in implementation correctness.

**Strengths**:
- Comprehensive state coverage (all documented conclusions/statuses)
- Legacy API compatibility validated
- Edge case handling verified
- Output structure validated

**Acceptable Gaps**:
- Error exit codes (integration test territory)
- Polling logic (complex timing test)
- Pagination edge case (rare scenario)

## Related

- [testing-002-test-first-development](testing-002-test-first-development.md)
- [testing-003-script-execution-isolation](testing-003-script-execution-isolation.md)
- [testing-004-coverage-pragmatism](testing-004-coverage-pragmatism.md)
- [testing-007-contract-testing](testing-007-contract-testing.md)
- [testing-008-entry-point-isolation](testing-008-entry-point-isolation.md)