-------|---------|--------| | TestProperty_Money_AmountNeverNegative | Money | PASS | | TestProperty_Money_CurrencyAlwaysValid | Money | PASS | | TestProperty_Money_AdditionCommutative | Money | PASS |

code

  ## Handoff to Next Gate
  - Ready for Gate 6 (Integration Testing): YES

Dev Property Testing (Gate 5)

Name: ring:dev-property-testing
Rating: 92
Author: LerianStudio

Overview

Ensure domain logic has property-based tests to verify invariants hold for all randomly generated inputs.

Core principle: Property tests verify universal truths about your domain. If "balance is never negative" is a rule, test it with thousands of random inputs.

<block_condition>

•No property functions = FAIL
•Any counterexample found = FAIL (fix and re-run)
•No quick.Check usage = FAIL </block_condition>

CRITICAL: Role Clarification

This skill ORCHESTRATES. QA Analyst Agent (property mode) EXECUTES.

Who	Responsibility
This Skill	Gather requirements, dispatch agent, track iterations
QA Analyst Agent	Write property tests, run quick.Check, report counterexamples

Standards Reference

MANDATORY: Load testing-property.md standards via WebFetch.

<fetch_required> https://raw.githubusercontent.com/LerianStudio/ring/main/dev-team/docs/standards/golang/testing-property.md </fetch_required>

Step 1: Validate Input

text

REQUIRED INPUT:
- unit_id: [task/subtask being tested]
- implementation_files: [files from Gate 0]
- language: [go]

OPTIONAL INPUT:
- domain_invariants: [list of invariants to verify]
- gate4_handoff: [full Gate 4 output]

if any REQUIRED input is missing:
  → STOP and report: "Missing required input: [field]"

Step 2: Dispatch QA Analyst Agent (Property Mode)

text

Task tool:
  subagent_type: "ring:qa-analyst"
  model: "opus"
  prompt: |
    **MODE:** PROPERTY-BASED TESTING (Gate 5)

    **Standards:** Load testing-property.md

    **Input:**
    - Unit ID: {unit_id}
    - Implementation Files: {implementation_files}
    - Language: {language}
    - Domain Invariants: {domain_invariants}

    **Requirements:**
    1. Identify domain invariants from code
    2. Create property functions (TestProperty_{Subject}_{Property} naming)
    3. Use testing/quick.Check for verification
    4. Report any counterexamples found

    **Output Sections Required:**
    - ## Property Testing Summary
    - ## Properties Report
    - ## Handoff to Next Gate

Step 3: Evaluate Results

text

Parse agent output:

if "Status: PASS" in output:
  → Gate 5 PASSED
  → Return success with metrics

if "Status: FAIL" in output:
  → Dispatch fix to implementation agent
  → Re-run property tests (max 3 iterations)
  → If still failing: ESCALATE to user

Step 4: Generate Output

text

## Property Testing Summary
**Status:** {PASS|FAIL}
**Properties Tested:** {count}
**Properties Passed:** {count}
**Counterexamples Found:** {count}

## Properties Report
| Property | Subject | Status |
|----------|---------|--------|
| {property_name} | {subject} | {PASS|FAIL} |

## Handoff to Next Gate
- Ready for Gate 6 (Integration Testing): {YES|NO}
- Iterations: {count}

Common Properties to Test

Domain	Example Properties
Money/Currency	Amount never negative, currency always valid, addition commutative
User/Account	Email always valid format, password meets policy, status transitions valid
Order/Transaction	Total equals sum of items, quantity always positive, state machine valid
Date/Time	Start before end, duration always positive, timezone valid

Anti-Rationalization Table

Rationalization	Why It's WRONG	Required Action
"Unit tests verify logic"	Unit tests verify SPECIFIC cases. Properties verify ALL cases.	Write property tests
"No domain invariants"	Every domain has rules. "ID is unique", "amount > 0", etc.	Identify and test invariants
"Too abstract"	Properties are concrete: "user.age >= 0 for all users".	Write property tests
"quick.Check is slow"	Milliseconds to find bugs that would take hours to discover.	Write property tests