---
title: "Slash Command: /test-coverage"
platform: "Promptally"
canonical_url: "https://app.promptally.dev/p/cmd-test-coverage"
modality: "SLASH_COMMAND"
category: "Interactive Slash Commands"
compatible_models: [Universal / Model Agnostic]
access_tier: "Free Public Artifact (No Auth Required)"
license: "MIT"
---

# Slash Command: /test-coverage

**Summary:** Slash Command: /test-coverage is a verified SLASH COMMAND blueprint on Promptally in Interactive Slash Commands optimized for leading AI models. Analyze coverage, identify gaps, and generate missing tests toward the target threshold. Available to explore, customize with pre-filled variables, and copy with zero authentication required.

## Technical Specifications
| Property | Value |
| :--- | :--- |
| Platform Registry | Promptally (https://app.promptally.dev) |
| Modality | SLASH_COMMAND |
| Category | Interactive Slash Commands |
| Compatible Engines | Universal / Model Agnostic |
| Dynamic Variables | None (Static Blueprint) |
| Approx. Token Length | 623 |
| Access Tier | Free Public Artifact (No Auth Required) |
| License | MIT |

### Pre-Filled Template & Production Source

````md
# Test Coverage

Analyze test coverage, identify gaps, and generate missing tests to reach 80%+ coverage.

## Step 1: Detect Test Framework

| Indicator | Coverage Command |
|-----------|-----------------|
| `jest.config.*` or `package.json` jest | `npx jest --coverage --coverageReporters=json-summary` |
| `vitest.config.*` | `npx vitest run --coverage` |
| `pytest.ini` / `pyproject.toml` pytest | `pytest --cov=src --cov-report=json` |
| `Cargo.toml` | `cargo llvm-cov --json` |
| `pom.xml` with JaCoCo | `mvn test jacoco:report` |
| `go.mod` | `go test -coverprofile=coverage.out ./...` |

## Step 2: Analyze Coverage Report

1. Run the coverage command
2. Parse the output (JSON summary or terminal output)
3. List files **below 80% coverage**, sorted worst-first
4. For each under-covered file, identify:
   - Untested functions or methods
   - Missing branch coverage (if/else, switch, error paths)
   - Dead code that inflates the denominator

## Step 3: Generate Missing Tests

For each under-covered file, generate tests following this priority:

1. **Happy path** — Core functionality with valid inputs
2. **Error handling** — Invalid inputs, missing data, network failures
3. **Edge cases** — Empty arrays, null/undefined, boundary values (0, -1, MAX_INT)
4. **Branch coverage** — Each if/else, switch case, ternary

### Test Generation Rules

- Place tests adjacent to source: `foo.ts` → `foo.test.ts` (or project convention)
- Use existing test patterns from the project (import style, assertion library, mocking approach)
- Mock external dependencies (database, APIs, file system)
- Each test should be independent — no shared mutable state between tests
- Name tests descriptively: `test_create_user_with_duplicate_email_returns_409`

## Step 4: Verify

1. Run the full test suite — all tests must pass
2. Re-run coverage — verify improvement
3. If still below 80%, repeat Step 3 for remaining gaps

## Step 5: Report

Show before/after comparison:

```
Coverage Report
──────────────────────────────
File                   Before  After
src/services/auth.ts   45%     88%
src/utils/validation.ts 32%    82%
──────────────────────────────
Overall:               67%     84%  PASS:
```

## Focus Areas

- Functions with complex branching (high cyclomatic complexity)
- Error handlers and catch blocks
- Utility functions used across the codebase
- API endpoint handlers (request → response flow)
- Edge cases: null, undefined, empty string, empty array, zero, negative numbers
````

## Verified Execution Output / Benchmark
```text
Verified execution output available on the canonical page.
```

## Related Blueprints on Promptally
- [Slash Command: /spawn](https://app.promptally.dev/p/cmd-spawn)
- [Slash Command: /pm](https://app.promptally.dev/p/cmd-pm)
- [Slash Command: /reflect](https://app.promptally.dev/p/cmd-reflect)
- [Slash Command: /git](https://app.promptally.dev/p/cmd-git)
- [Slash Command: /test](https://app.promptally.dev/p/cmd-test)
- [Slash Command: /select-tool](https://app.promptally.dev/p/cmd-select-tool)
- [Slash Command: /improve](https://app.promptally.dev/p/cmd-improve)
- [Slash Command: /agent](https://app.promptally.dev/p/cmd-agent)