jest-test-generator

Jest Test Generator - Auto-activating skill for Test Automation. Triggers on: jest test generator, jest test generator Part of the Test Automation skill category.

Install with Tessl CLI

npx tessl i github:jeremylongshore/claude-code-plugins-plus-skills --skill jest-test-generator

What are skills?

1.00x

Quality

Does it follow best practices?

Impact

96%

1.00x

Average score across 3 eval scenarios

Optimize this skill with Tessl

npx tessl skill review --optimize ./planned-skills/generated/09-test-automation/jest-test-generator/SKILL.md

SKILL.md

Review

Evals

Evaluation results

100%

Unit Tests for a String Utility Library

Unit test generation with Jest best practices

Criteria

Without context

With context

describe() grouping

100%

it()/test() blocks

100%

Appropriate matchers

100%

No placeholders

100%

Runnable code

100%

Edge case coverage

100%

expect() usage

100%

Multiple test cases per function

100%

Descriptive test names

100%

No test interdependency

100%

Without context: $0.3709 · 1m 55s · 18 turns · 19 in / 5,892 out tokens

With context: $0.4113 · 1m 36s · 22 turns · 22 in / 5,572 out tokens

100%

Tests for a Weather Data Service

Jest mocking of external dependencies

Criteria

Without context

With context

jest.mock() used

100%

Mock return value set

100%

Happy path tested

100%

Error path tested

100%

Mock call assertions

100%

beforeEach mock reset

80%

100%

describe() structure

100%

No placeholders

100%

Runnable code

100%

Async handling

100%

No real HTTP calls

100%

Without context: $0.1856 · 45s · 11 turns · 11 in / 2,989 out tokens

With context: $0.3999 · 1m 29s · 23 turns · 21 in / 5,595 out tokens

90%

Set Up Test Infrastructure for a TypeScript Microservice

Jest configuration for TypeScript project

Criteria

Without context

With context

Config file created

100%

TypeScript transform

100%

testMatch or testRegex

100%

moduleFileExtensions

Coverage enabled

100%

Coverage reporters

100%

No placeholders

100%

Valid preset or globals

100%

testEnvironment set

100%

Dependency list provided

100%

Without context: $0.2694 · 1m 10s · 20 turns · 62 in / 2,997 out tokens

With context: $0.4450 · 1m 36s · 27 turns · 60 in / 5,002 out tokens

Evaluated: 5 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Unit Tests for a String Utility Library Tests for a Weather Data Service Set Up Test Infrastructure for a TypeScript Microservice

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