Propose Feature Test Plan Skill

Create a test plan that systematically maps requirements and constraints to concrete tests.

Roles

You (reading this file) are the orchestrator.

⚠️ You do NOT read files in phases/ — pass them to subagents via context_files. Subagents read their phase file and execute it.

Orchestrator Loop

import json

workspace = f"planning/test-plan-{feature_number}-{feature_name}"
bash(f"mkdir -p {workspace}", on_error="raise")

input_data = {"feature_number": feature_number, "feature_name": feature_name}
write("create", f"{workspace}/input.json", file_text=json.dumps(input_data))

while True:
    result = bash(f"python3 skills/propose-feature-test-plan/next-step.py {workspace}", on_error="raise")
    action = json.loads(result)
    
    if action["type"] == "done":
        summary = fs_read("Line", f"{workspace}/plan-summary.md", 1, 100)
        log(summary)
        break
    
    if action["type"] == "gate_failed":
        log(f"Gate failed: {action['reason']}")
        break
    
    if action["type"] == "spawn":
        r = spawn(
            action["prompt"],
            context_files=action["context_files"],
            context_data=action.get("context_data"),
            allow_tools=True
        )
        write("create", f"{workspace}/{action['output_file']}", file_text=r.response)

Handling Exceptions

The state machine handles the happy path. When things go wrong, exercise judgment:

Don't silently advance past failures. Either retry, fail explicitly, or document gaps.

Anti-Patterns

Phases

1. VERIFY: Check that concept.md, requirements.md, and design.md exist
2. EXTRACT: Pull all REQ-* and CC-* identifiers from documents
3. PLAN: Create test-plan.md mapping requirements/constraints to tests

Inputs

Before starting, gather:

• Feature number (e.g., "0042")
• Feature name (e.g., "custom-settings")

Outputs

• Test plan document at $FOREST_ROOT/docs/features/NNNN-feature-name/test-plan.md
• Summary in workspace showing coverage statistics

When to Use

• Design document with Critical Constraints exists
• Ready to plan testing approach before implementation
• Need to document what tests will verify each requirement

Prerequisites

• Feature concept exists in $FOREST_ROOT/docs/features/NNNN-feature-name/concept.md
• Requirements exist in $FOREST_ROOT/docs/features/NNNN-feature-name/requirements.md
• Design exists in $FOREST_ROOT/docs/features/NNNN-feature-name/design.md (contains Critical Constraints)

Test Plan Structure

The generated test plan includes:

• Overview: Brief description of testing approach
• Test Types: Definitions of unit/integration/not-testable/out-of-scope
• Requirements Coverage: Table mapping each REQ-* to test type, name, and description
• Critical Constraints Verification: Table mapping each CC-* to verification approach
• Integration Test Requirements: Guidance for CLI testing (test actual commands, not internals)
• Test Implementation Notes: Specific guidance for implementing tests

Test Type Guidelines

• Unit: Internal logic, algorithms, data transformations (mocks allowed)
• Integration: File I/O, network calls, CLI commands, external processes (NO mocks)
• Not testable: Cannot be automated (subjective quality, human judgment, infeasible setup)
• Out of scope: Requires authentication with external systems (cloud APIs, registries)

CLI Testing Principle

For CLI programs, integration tests MUST:

• Exercise the actual CLI binary/commands users run
• NOT test internal APIs directly
• Do what the user/customer will actually do

Validation

After completion, verify:

# Check file exists
ls $FOREST_ROOT/docs/features/NNNN-feature-name/test-plan.md

# Verify all requirements are covered
grep -c "REQ-" $FOREST_ROOT/docs/features/NNNN-feature-name/test-plan.md
grep -c "REQ-" $FOREST_ROOT/docs/features/NNNN-feature-name/requirements.md

# Verify all constraints are covered
grep -c "CC-" $FOREST_ROOT/docs/features/NNNN-feature-name/test-plan.md
grep -c "CC-" $FOREST_ROOT/docs/features/NNNN-feature-name/design.md

Common Issues

Missing coverage: Every REQ-* and CC-* must appear in the test plan. Use validation grep commands to check.

Wrong test type: Unit tests should not touch filesystem/network. Integration tests should not use mocks.

Testing internals instead of behavior: For CLI tools, test the CLI commands users run, not internal functions.

Vague descriptions: Test descriptions should state what specific behavior is verified.

Next Steps

After creating the test plan:

1. Review coverage with stakeholders
2. Proceed to propose-implementation-plan skill to plan implementation
3. Implementation plan should reference test-plan.md for test requirements