tdd

Use when implementing any feature or bugfix, before writing implementation code

Install with Tessl CLI

npx tessl i github:shousper/claude-kit --skill tdd

What are skills?

1.00x

Review — 50%

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Evaluation — 100%

↑ 1.00x

Agent success when using this skill

Validation — 11 / 11 Passed

Validation for skill structure

SKILL.md

Review

Evals

Evaluation results

100%

Token Budget Tracker

TDD Red-Green-Refactor cycle

Criteria

Without context

With context

RED before GREEN evidence

100%

Correct failure reason

100%

GREEN verification shown

100%

REFACTOR step present

100%

Minimal implementation

100%

Single behavior per test

100%

Descriptive test names

100%

No mocks in tests

100%

Multiple TDD cycles

100%

Pristine output

100%

Without context: $1.0544 · 4m 9s · 52 turns · 59 in / 12,669 out tokens

With context: $1.0884 · 3m 20s · 46 turns · 295 in / 10,353 out tokens

100%

Fix the Subscription Renewal Calculator

Bug fix with test-first

Criteria

Without context

With context

Failing test before fix

100%

Test reproduces the bug

100%

Failure is assertion not crash

100%

Minimal fix applied

100%

All tests pass after fix

100%

Descriptive test name

100%

No pre-emptive implementation

100%

Discount calculation tested

100%

Single behavior per test

100%

No test-only methods in production

100%

Without context: $0.6643 · 2m 42s · 32 turns · 38 in / 9,079 out tokens

With context: $0.7644 · 2m 21s · 37 turns · 72 in / 6,873 out tokens

100%

Write Tests for the Metrics Aggregator Service

Testing anti-patterns and mocking

Criteria

Without context

With context

No test-only methods in production

100%

Mock response includes ok property

100%

Mock response includes status property

100%

Mock response includes json method

100%

fetch is mocked, not service methods

100%

Tests assert on return values

100%

Error behavior tested with throws

100%

No mock-existence assertions

100%

Test cleanup outside production class

100%

Both service methods tested

100%

Without context: $0.4725 · 2m 7s · 26 turns · 32 in / 6,981 out tokens

With context: $0.5888 · 1m 58s · 28 turns · 31 in / 6,344 out tokens

Evaluated: about 4 hours ago
Agent: Claude Code
Model: Unknown

Table of Contents

Token Budget Tracker Fix the Subscription Renewal Calculator Write Tests for the Metrics Aggregator Service

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