loader/.cursor/skills/test-spec/SKILL.md

---
name: test-spec
description: |
  Test specification skill. Analyzes input data and expected results completeness,
  then produces detailed test scenarios (blackbox, performance, resilience, security, resource limits)
  that treat the system as a black box. Every test pairs input data with quantifiable expected results
  so tests can verify correctness, not just execution.
  4-phase workflow: input data + expected results analysis, test scenario specification, data + results validation gate,
  test runner script generation. Produces 8 artifacts under tests/ and 2 shell scripts under scripts/.
  Trigger phrases:
  - "test spec", "test specification", "test scenarios"
  - "blackbox test spec", "black box tests", "blackbox tests"
  - "performance tests", "resilience tests", "security tests"
category: build
tags: [testing, black-box, blackbox-tests, test-specification, qa]
disable-model-invocation: true
---

# Test Scenario Specification

Analyze input data completeness and produce detailed black-box test specifications. Tests describe what the system should do given specific inputs — they never reference internals.

## Core Principles

- **Black-box only**: tests describe observable behavior through public interfaces; no internal implementation details
- **Traceability**: every test traces to at least one acceptance criterion or restriction
- **Save immediately**: write artifacts to disk after each phase; never accumulate unsaved work
- **Ask, don't assume**: when requirements are ambiguous, ask the user before proceeding
- **Spec, don't code**: this workflow produces test specifications, never test implementation code
- **No test without data**: every test scenario MUST have concrete test data; tests without data are removed
- **No test without expected result**: every test scenario MUST pair input data with a quantifiable expected result; a test that cannot compare actual output against a known-correct answer is not verifiable and must be removed

## Context Resolution

Fixed paths — no mode detection needed:

- PROBLEM_DIR: `_docs/00_problem/`
- SOLUTION_DIR: `_docs/01_solution/`
- DOCUMENT_DIR: `_docs/02_document/`
- TESTS_OUTPUT_DIR: `_docs/02_document/tests/`

Announce the resolved paths to the user before proceeding.

## Input Specification

### Required Files

| File | Purpose |
|------|---------|
| `_docs/00_problem/problem.md` | Problem description and context |
| `_docs/00_problem/acceptance_criteria.md` | Measurable acceptance criteria |
| `_docs/00_problem/restrictions.md` | Constraints and limitations |
| `_docs/00_problem/input_data/` | Reference data examples, expected results, and optional reference files |
| `_docs/01_solution/solution.md` | Finalized solution |

### Expected Results Specification

Every input data item MUST have a corresponding expected result that defines what the system should produce. Expected results MUST be **quantifiable** — the test must be able to programmatically compare actual system output against the expected result and produce a pass/fail verdict.

Expected results live inside `_docs/00_problem/input_data/` in one or both of:

1. **Mapping file** (`input_data/expected_results/results_report.md`): a table pairing each input with its quantifiable expected output, using the format defined in `.cursor/skills/test-spec/templates/expected-results.md`

2. **Reference files folder** (`input_data/expected_results/`): machine-readable files (JSON, CSV, etc.) containing full expected outputs for complex cases, referenced from the mapping file

```
input_data/
├── expected_results/            ← required: expected results folder
│   ├── results_report.md        ← required: input→expected result mapping
│   ├── image_01_expected.csv    ← per-file expected detections
│   └── video_01_expected.csv
├── image_01.jpg
├── empty_scene.jpg
└── data_parameters.md
```

**Quantifiability requirements** (see template for full format and examples):
- Numeric values: exact value or value ± tolerance (e.g., `confidence ≥ 0.85`, `position ± 10px`)
- Structured data: exact JSON/CSV values, or a reference file in `expected_results/`
- Counts: exact counts (e.g., "3 detections", "0 errors")
- Text/patterns: exact string or regex pattern to match
- Timing: threshold (e.g., "response ≤ 500ms")
- Error cases: expected error code, message pattern, or HTTP status

### Optional Files (used when available)

| File | Purpose |
|------|---------|
| `DOCUMENT_DIR/architecture.md` | System architecture for environment design |
| `DOCUMENT_DIR/system-flows.md` | System flows for test scenario coverage |
| `DOCUMENT_DIR/components/` | Component specs for interface identification |

### Prerequisite Checks (BLOCKING)

1. `acceptance_criteria.md` exists and is non-empty — **STOP if missing**
2. `restrictions.md` exists and is non-empty — **STOP if missing**
3. `input_data/` exists and contains at least one file — **STOP if missing**
4. `input_data/expected_results/results_report.md` exists and is non-empty — **STOP if missing**. Prompt the user: *"Expected results mapping is required. Please create `_docs/00_problem/input_data/expected_results/results_report.md` pairing each input with its quantifiable expected output. Use `.cursor/skills/test-spec/templates/expected-results.md` as the format reference."*
5. `problem.md` exists and is non-empty — **STOP if missing**
6. `solution.md` exists and is non-empty — **STOP if missing**
7. Create TESTS_OUTPUT_DIR if it does not exist
8. If TESTS_OUTPUT_DIR already contains files, ask user: **resume from last checkpoint or start fresh?**

## Artifact Management

### Directory Structure

```
TESTS_OUTPUT_DIR/
├── environment.md
├── test-data.md
├── blackbox-tests.md
├── performance-tests.md
├── resilience-tests.md
├── security-tests.md
├── resource-limit-tests.md
└── traceability-matrix.md
```

### Save Timing

| Phase | Save immediately after | Filename |
|-------|------------------------|----------|
| Phase 1 | Input data analysis (no file — findings feed Phase 2) | — |
| Phase 2 | Environment spec | `environment.md` |
| Phase 2 | Test data spec | `test-data.md` |
| Phase 2 | Blackbox tests | `blackbox-tests.md` |
| Phase 2 | Performance tests | `performance-tests.md` |
| Phase 2 | Resilience tests | `resilience-tests.md` |
| Phase 2 | Security tests | `security-tests.md` |
| Phase 2 | Resource limit tests | `resource-limit-tests.md` |
| Phase 2 | Traceability matrix | `traceability-matrix.md` |
| Phase 3 | Updated test data spec (if data added) | `test-data.md` |
| Phase 3 | Updated test files (if tests removed) | respective test file |
| Phase 3 | Updated traceability matrix (if tests removed) | `traceability-matrix.md` |
| Phase 4 | Test runner script | `scripts/run-tests.sh` |
| Phase 4 | Performance test runner script | `scripts/run-performance-tests.sh` |

### Resumability

If TESTS_OUTPUT_DIR already contains files:

1. List existing files and match them to the save timing table above
2. Identify which phase/artifacts are complete
3. Resume from the next incomplete artifact
4. Inform the user which artifacts are being skipped

## Progress Tracking

At the start of execution, create a TodoWrite with all four phases. Update status as each phase completes.

## Workflow

### Phase 1: Input Data Completeness Analysis

**Role**: Professional Quality Assurance Engineer
**Goal**: Assess whether the available input data is sufficient to build comprehensive test scenarios
**Constraints**: Analysis only — no test specs yet

1. Read `_docs/01_solution/solution.md`
2. Read `acceptance_criteria.md`, `restrictions.md`
3. Read testing strategy from solution.md (if present)
4. If `DOCUMENT_DIR/architecture.md` and `DOCUMENT_DIR/system-flows.md` exist, read them for additional context on system interfaces and flows
5. Read `input_data/expected_results/results_report.md` and any referenced files in `input_data/expected_results/`
6. Analyze `input_data/` contents against:
   - Coverage of acceptance criteria scenarios
   - Coverage of restriction edge cases
   - Coverage of testing strategy requirements
7. Analyze `input_data/expected_results/results_report.md` completeness:
   - Every input data item has a corresponding expected result row in the mapping
   - Expected results are quantifiable (contain numeric thresholds, exact values, patterns, or file references — not vague descriptions like "works correctly" or "returns result")
   - Expected results specify a comparison method (exact match, tolerance range, pattern match, threshold) per the template
   - Reference files in `input_data/expected_results/` that are cited in the mapping actually exist and are valid
8. Present input-to-expected-result pairing assessment:

| Input Data | Expected Result Provided? | Quantifiable? | Issue (if any) |
|------------|--------------------------|---------------|----------------|
| [file/data] | Yes/No | Yes/No | [missing, vague, no tolerance, etc.] |

9. Threshold: at least 70% coverage of scenarios AND every covered scenario has a quantifiable expected result (see `.cursor/rules/cursor-meta.mdc` Quality Thresholds table)
10. If coverage is low, search the internet for supplementary data, assess quality with user, and if user agrees, add to `input_data/` and update `input_data/expected_results/results_report.md`
11. If expected results are missing or not quantifiable, ask user to provide them before proceeding

**BLOCKING**: Do NOT proceed until user confirms both input data coverage AND expected results completeness are sufficient.

---

### Phase 2: Test Scenario Specification

**Role**: Professional Quality Assurance Engineer
**Goal**: Produce detailed black-box test specifications covering blackbox, performance, resilience, security, and resource limit scenarios
**Constraints**: Spec only — no test code. Tests describe what the system should do given specific inputs, not how the system is built.

Based on all acquired data, acceptance_criteria, and restrictions, form detailed test scenarios:

1. Define test environment using `.cursor/skills/plan/templates/test-environment.md` as structure
2. Define test data management using `.cursor/skills/plan/templates/test-data.md` as structure
3. Write blackbox test scenarios (positive + negative) using `.cursor/skills/plan/templates/blackbox-tests.md` as structure
4. Write performance test scenarios using `.cursor/skills/plan/templates/performance-tests.md` as structure
5. Write resilience test scenarios using `.cursor/skills/plan/templates/resilience-tests.md` as structure
6. Write security test scenarios using `.cursor/skills/plan/templates/security-tests.md` as structure
7. Write resource limit test scenarios using `.cursor/skills/plan/templates/resource-limit-tests.md` as structure
8. Build traceability matrix using `.cursor/skills/plan/templates/traceability-matrix.md` as structure

**Self-verification**:
- [ ] Every acceptance criterion is covered by at least one test scenario
- [ ] Every restriction is verified by at least one test scenario
- [ ] Every test scenario has a quantifiable expected result from `input_data/expected_results/results_report.md`
- [ ] Expected results use comparison methods from `.cursor/skills/test-spec/templates/expected-results.md`
- [ ] Positive and negative scenarios are balanced
- [ ] Consumer app has no direct access to system internals
- [ ] Test environment matches project constraints (see Hardware-Dependency & Execution Environment Assessment below)
- [ ] External dependencies have mock/stub services defined
- [ ] Traceability matrix has no uncovered AC or restrictions

**Save action**: Write all files under TESTS_OUTPUT_DIR:
- `environment.md`
- `test-data.md`
- `blackbox-tests.md`
- `performance-tests.md`
- `resilience-tests.md`
- `security-tests.md`
- `resource-limit-tests.md`
- `traceability-matrix.md`

**BLOCKING**: Present test coverage summary (from traceability-matrix.md) to user. Do NOT proceed until confirmed.

Capture any new questions, findings, or insights that arise during test specification — these feed forward into downstream skills (plan, refactor, etc.).

---

### Phase 3: Test Data Validation Gate (HARD GATE)

**Role**: Professional Quality Assurance Engineer
**Goal**: Ensure every test scenario produced in Phase 2 has concrete, sufficient test data. Remove tests that lack data. Verify final coverage stays above 70%.
**Constraints**: This phase is MANDATORY and cannot be skipped.

#### Step 1 — Build the test-data and expected-result requirements checklist

Scan `blackbox-tests.md`, `performance-tests.md`, `resilience-tests.md`, `security-tests.md`, and `resource-limit-tests.md`. For every test scenario, extract:

| # | Test Scenario ID | Test Name | Required Input Data | Required Expected Result | Result Quantifiable? | Comparison Method | Input Provided? | Expected Result Provided? |
|---|-----------------|-----------|---------------------|-------------------------|---------------------|-------------------|----------------|--------------------------|
| 1 | [ID] | [name] | [data description] | [what system should output] | [Yes/No] | [exact/tolerance/pattern/threshold] | [Yes/No] | [Yes/No] |

Present this table to the user.

#### Step 2 — Ask user to provide missing test data AND expected results

For each row where **Input Provided?** is **No** OR **Expected Result Provided?** is **No**, ask the user:

> **Option A — Provide the missing items**: Supply what is missing:
> - **Missing input data**: Place test data files in `_docs/00_problem/input_data/` or indicate the location.
> - **Missing expected result**: Provide the quantifiable expected result for this input. Update `_docs/00_problem/input_data/expected_results/results_report.md` with a row mapping the input to its expected output. If the expected result is complex, provide a reference CSV file in `_docs/00_problem/input_data/expected_results/`. Use `.cursor/skills/test-spec/templates/expected-results.md` for format guidance.
>
> Expected results MUST be quantifiable — the test must be able to programmatically compare actual vs expected. Examples:
> - "3 detections with bounding boxes [(x1,y1,x2,y2), ...] ± 10px"
> - "HTTP 200 with JSON body matching `expected_response_01.json`"
> - "Processing time < 500ms"
> - "0 false positives in the output set"
>
> **Option B — Skip this test**: If you cannot provide the data or expected result, this test scenario will be **removed** from the specification.

**BLOCKING**: Wait for the user's response for every missing item.

#### Step 3 — Validate provided data and expected results

For each item where the user chose **Option A**:

**Input data validation**:
1. Verify the data file(s) exist at the indicated location
2. Verify **quality**: data matches the format, schema, and constraints described in the test scenario (e.g., correct image resolution, valid JSON structure, expected value ranges)
3. Verify **quantity**: enough data samples to cover the scenario (e.g., at least N images for a batch test, multiple edge-case variants)

**Expected result validation**:
4. Verify the expected result exists in `input_data/expected_results/results_report.md` or as a referenced file in `input_data/expected_results/`
5. Verify **quantifiability**: the expected result can be evaluated programmatically — it must contain at least one of:
   - Exact values (counts, strings, status codes)
   - Numeric values with tolerance (e.g., `± 10px`, `≥ 0.85`)
   - Pattern matches (regex, substring, JSON schema)
   - Thresholds (e.g., `< 500ms`, `≤ 5% error rate`)
   - Reference file for structural comparison (JSON diff, CSV diff)
6. Verify **completeness**: the expected result covers all outputs the test checks (not just one field when the test validates multiple)
7. Verify **consistency**: the expected result is consistent with the acceptance criteria it traces to

If any validation fails, report the specific issue and loop back to Step 2 for that item.

#### Step 4 — Remove tests without data or expected results

For each item where the user chose **Option B**:

1. Warn the user: `⚠️ Test scenario [ID] "[Name]" will be REMOVED from the specification due to missing test data or expected result.`
2. Remove the test scenario from the respective test file
3. Remove corresponding rows from `traceability-matrix.md`
4. Update `test-data.md` to reflect the removal

**Save action**: Write updated files under TESTS_OUTPUT_DIR:
- `test-data.md`
- Affected test files (if tests removed)
- `traceability-matrix.md` (if tests removed)

#### Step 5 — Final coverage check

After all removals, recalculate coverage:

1. Count remaining test scenarios that trace to acceptance criteria
2. Count total acceptance criteria + restrictions
3. Calculate coverage percentage: `covered_items / total_items * 100`

| Metric | Value |
|--------|-------|
| Total AC + Restrictions | ? |
| Covered by remaining tests | ? |
| **Coverage %** | **?%** |

**Decision**:

- **Coverage ≥ 70%** → Phase 3 **PASSED**. Present final summary to user.
- **Coverage < 70%** → Phase 3 **FAILED**. Report:
  > ❌ Test coverage dropped to **X%** (minimum 70% required). The removed test scenarios left gaps in the following acceptance criteria / restrictions:
  >
  > | Uncovered Item | Type (AC/Restriction) | Missing Test Data Needed |
  > |---|---|---|
  >
  > **Action required**: Provide the missing test data for the items above, or add alternative test scenarios that cover these items with data you can supply.

  **BLOCKING**: Loop back to Step 2 with the uncovered items. Do NOT finalize until coverage ≥ 70%.

#### Phase 3 Completion

When coverage ≥ 70% and all remaining tests have validated data AND quantifiable expected results:

1. Present the final coverage report
2. List all removed tests (if any) with reasons
3. Confirm every remaining test has: input data + quantifiable expected result + comparison method
4. Confirm all artifacts are saved and consistent

---

### Hardware-Dependency & Execution Environment Assessment (BLOCKING — runs before Phase 4)

Docker is the **preferred** test execution environment (reproducibility, isolation, CI parity). However, hardware-dependent projects may require local execution to exercise the real code paths. This assessment determines the right execution strategy by scanning both documentation and source code.

#### Step 1 — Documentation scan

Check the following files for mentions of hardware-specific requirements:

| File | Look for |
|------|----------|
| `_docs/00_problem/restrictions.md` | Platform requirements, hardware constraints, OS-specific features |
| `_docs/01_solution/solution.md` | Engine selection logic, platform-dependent paths, hardware acceleration |
| `_docs/02_document/architecture.md` | Component diagrams showing hardware layers, engine adapters |
| `_docs/02_document/components/*/description.md` | Per-component hardware mentions |
| `TESTS_OUTPUT_DIR/environment.md` | Existing environment decisions |

#### Step 2 — Code scan

Search the project source for indicators of hardware dependence. The project is **hardware-dependent** if ANY of the following are found:

| Category | Code indicators (imports, APIs, config) |
|----------|-----------------------------------------|
| GPU / CUDA | `import pycuda`, `import tensorrt`, `import pynvml`, `torch.cuda`, `nvidia-smi`, `CUDA_VISIBLE_DEVICES`, `runtime: nvidia` |
| Apple Neural Engine / CoreML | `import coremltools`, `CoreML`, `MLModel`, `ComputeUnit`, `MPS`, `sys.platform == "darwin"`, `platform.machine() == "arm64"` |
| OpenCL / Vulkan | `import pyopencl`, `clCreateContext`, vulkan headers |
| TPU / FPGA | `import tensorflow.distribute.TPUStrategy`, FPGA bitstream loaders |
| Sensors / Cameras | `import cv2.VideoCapture(0)` (device index), serial port access, GPIO, V4L2 |
| OS-specific services | Kernel modules (`modprobe`), host-level drivers, platform-gated code (`sys.platform` branches selecting different backends) |

Also check dependency files (`requirements.txt`, `setup.py`, `pyproject.toml`, `Cargo.toml`, `*.csproj`) for hardware-specific packages.

#### Step 3 — Classify the project

Based on Steps 1–2, classify the project:

- **Not hardware-dependent**: no indicators found → use Docker (preferred default), skip to "Record the decision" below
- **Hardware-dependent**: one or more indicators found → proceed to Step 4

#### Step 4 — Present execution environment choice

Present the findings and ask the user using Choose format:

```
══════════════════════════════════════
 DECISION REQUIRED: Test execution environment
══════════════════════════════════════
 Hardware dependencies detected:
 - [list each indicator found, with file:line]
══════════════════════════════════════
 Running in Docker means these hardware code paths
 are NOT exercised — Docker uses a Linux VM where
 [specific hardware, e.g. CoreML / CUDA] is unavailable.
 The system would fall back to [fallback engine/path].
══════════════════════════════════════
 A) Local execution only (tests the real hardware path)
 B) Docker execution only (tests the fallback path)
 C) Both local and Docker (tests both paths, requires
    two test runs — recommended for CI with heterogeneous
    runners)
══════════════════════════════════════
 Recommendation: [A, B, or C] — [reason]
══════════════════════════════════════
```

#### Step 5 — Record the decision

Write or update a **"Test Execution"** section in `TESTS_OUTPUT_DIR/environment.md` with:

1. **Decision**: local / docker / both
2. **Hardware dependencies found**: list with file references
3. **Execution instructions** per chosen mode:
   - **Local mode**: prerequisites (OS, SDK, hardware), how to start services, how to run the test runner, environment variables
   - **Docker mode**: docker-compose profile/command, required images, how results are collected
   - **Both mode**: instructions for each, plus guidance on which CI runner type runs which mode

---

### Phase 4: Test Runner Script Generation

**Skip condition**: If this skill was invoked from the `/plan` skill (planning context, no code exists yet), skip Phase 4 entirely. Script creation should instead be planned as a task during decompose — the decomposer creates a task for creating these scripts. Phase 4 only runs when invoked from the existing-code flow (where source code already exists) or standalone.

**Role**: DevOps engineer
**Goal**: Generate executable shell scripts that run the specified tests, so the autopilot and CI can invoke them consistently.
**Constraints**: Scripts must be idempotent, portable across dev/CI, and exit with non-zero on failure. Respect the Docker Suitability Assessment decision above.

#### Step 1 — Detect test infrastructure

1. Identify the project's test runner from manifests and config files:
   - Python: `pytest` (pyproject.toml, setup.cfg, pytest.ini)
   - .NET: `dotnet test` (*.csproj, *.sln)
   - Rust: `cargo test` (Cargo.toml)
   - Node: `npm test` or `vitest` / `jest` (package.json)
2. Check Docker Suitability Assessment result:
   - If **local execution** was chosen → do NOT generate docker-compose test files; scripts run directly on host
   - If **Docker execution** was chosen → identify/generate docker-compose files for integration/blackbox tests
3. Identify performance/load testing tools from dependencies (k6, locust, artillery, wrk, or built-in benchmarks)
4. Read `TESTS_OUTPUT_DIR/environment.md` for infrastructure requirements

#### Step 2 — Generate test runner

**Docker is the default.** Only generate a local `scripts/run-tests.sh` if the Hardware-Dependency Assessment determined **local** or **both** execution (i.e., the project requires real hardware like GPU/CoreML/TPU/sensors). For all other projects, use `docker-compose.test.yml` — it provides reproducibility, isolation, and CI parity without a custom shell script.

**If local script is needed** — create `scripts/run-tests.sh` at the project root using `.cursor/skills/test-spec/templates/run-tests-script.md` as structural guidance. The script must:

1. Set `set -euo pipefail` and trap cleanup on EXIT
2. **Install all project and test dependencies** (e.g. `pip install -q -r requirements.txt -r e2e/requirements.txt`, `dotnet restore`, `npm ci`). This prevents collection-time import errors on fresh environments.
3. Optionally accept a `--unit-only` flag to skip blackbox tests
4. Run unit/blackbox tests using the detected test runner (activate virtualenv if present, run test runner directly on host)
5. Print a summary of passed/failed/skipped tests
6. Exit 0 on all pass, exit 1 on any failure

**If Docker** — generate or update `docker-compose.test.yml` that builds the test image, installs all dependencies inside the container, runs the test suite, and exits with the test runner's exit code.

#### Step 3 — Generate `scripts/run-performance-tests.sh`

Create `scripts/run-performance-tests.sh` at the project root. The script must:

1. Set `set -euo pipefail` and trap cleanup on EXIT
2. Read thresholds from `_docs/02_document/tests/performance-tests.md` (or accept as CLI args)
3. Start the system under test (local or docker-compose, matching the Docker Suitability Assessment decision)
4. Run load/performance scenarios using the detected tool
5. Compare results against threshold values from the test spec
6. Print a pass/fail summary per scenario
7. Exit 0 if all thresholds met, exit 1 otherwise

#### Step 4 — Verify scripts

1. Verify both scripts are syntactically valid (`bash -n scripts/run-tests.sh`)
2. Mark both scripts as executable (`chmod +x`)
3. Present a summary of what each script does to the user

**Save action**: Write `scripts/run-tests.sh` and `scripts/run-performance-tests.sh` to the project root.

---

## Escalation Rules

| Situation | Action |
|-----------|--------|
| Missing acceptance_criteria.md, restrictions.md, or input_data/ | **STOP** — specification cannot proceed |
| Missing input_data/expected_results/results_report.md | **STOP** — ask user to provide expected results mapping using the template |
| Ambiguous requirements | ASK user |
| Input data coverage below 70% (Phase 1) | Search internet for supplementary data, ASK user to validate |
| Expected results missing or not quantifiable (Phase 1) | ASK user to provide quantifiable expected results before proceeding |
| Test scenario conflicts with restrictions | ASK user to clarify intent |
| System interfaces unclear (no architecture.md) | ASK user or derive from solution.md |
| Test data or expected result not provided for a test scenario (Phase 3) | WARN user and REMOVE the test |
| Final coverage below 70% after removals (Phase 3) | BLOCK — require user to supply data or accept reduced spec |

## Common Mistakes

- **Referencing internals**: tests must be black-box — no internal module names, no direct DB queries against the system under test
- **Vague expected outcomes**: "works correctly" is not a test outcome; use specific measurable values
- **Missing expected results**: input data without a paired expected result is useless — the test cannot determine pass/fail without knowing what "correct" looks like
- **Non-quantifiable expected results**: "should return good results" is not verifiable; expected results must have exact values, tolerances, thresholds, or pattern matches that code can evaluate
- **Missing negative scenarios**: every positive scenario category should have corresponding negative/edge-case tests
- **Untraceable tests**: every test should trace to at least one AC or restriction
- **Writing test code**: this skill produces specifications, never implementation code
- **Tests without data**: every test scenario MUST have concrete test data AND a quantifiable expected result; a test spec without either is not executable and must be removed

## Trigger Conditions

When the user wants to:
- Specify blackbox tests before implementation or refactoring
- Analyze input data completeness for test coverage
- Produce test scenarios from acceptance criteria

**Keywords**: "test spec", "test specification", "blackbox test spec", "black box tests", "blackbox tests", "test scenarios"

## Methodology Quick Reference

```
┌──────────────────────────────────────────────────────────────────────┐
│              Test Scenario Specification (4-Phase)                   │
├──────────────────────────────────────────────────────────────────────┤
│ PREREQ: Data Gate (BLOCKING)                                         │
│   → verify AC, restrictions, input_data (incl. expected_results.md)  │
│                                                                      │
│ Phase 1: Input Data & Expected Results Completeness Analysis         │
│   → assess input_data/ coverage vs AC scenarios (≥70%)               │
│   → verify every input has a quantifiable expected result            │
│   → present input→expected-result pairing assessment                 │
│   [BLOCKING: user confirms input data + expected results coverage]   │
│                                                                      │
│ Phase 2: Test Scenario Specification                                 │
│   → environment.md                                                   │
│   → test-data.md (with expected results mapping)                     │
│   → blackbox-tests.md (positive + negative)                          │
│   → performance-tests.md                                             │
│   → resilience-tests.md                                              │
│   → security-tests.md                                                │
│   → resource-limit-tests.md                                          │
│   → traceability-matrix.md                                           │
│   [BLOCKING: user confirms test coverage]                            │
│                                                                      │
│ Phase 3: Test Data & Expected Results Validation Gate (HARD GATE)    │
│   → build test-data + expected-result requirements checklist         │
│   → ask user: provide data+result (A) or remove test (B)             │
│   → validate input data (quality + quantity)                         │
│   → validate expected results (quantifiable + comparison method)     │
│   → remove tests without data or expected result, warn user          │
│   → final coverage check (≥70% or FAIL + loop back)                  │
│   [BLOCKING: coverage ≥ 70% required to pass]                        │
│                                                                      │
│ Phase 4: Test Runner Script Generation                               │
│   → detect test runner + docker-compose + load tool                  │
│   → scripts/run-tests.sh (unit + blackbox)                           │
│   → scripts/run-performance-tests.sh (load/perf scenarios)           │
│   → verify scripts are valid and executable                          │
├──────────────────────────────────────────────────────────────────────┤
│ Principles: Black-box only · Traceability · Save immediately         │
│             Ask don't assume · Spec don't code                       │
│             No test without data · No test without expected result   │
└──────────────────────────────────────────────────────────────────────┘
```