vitest

Use when writing unit/integration tests for Vite projects - configure vitest.config.ts, write test suites with describe/it, create mock implementations with vi.fn and vi.mock, set up code coverage thresholds, and run tests in parallel

Install with Tessl CLI

npx tessl i github:onmax/nuxt-skills --skill vitest

What are skills?

100

Review — 100%

Does it follow best practices?

Validation — 11 / 11 Passed

Validation for skill structure

SKILL.md

Review

Evals

Evaluation results

90%

24%

Vitest Setup for a Vite + TypeScript Project

Vitest config and coverage setup

Criteria

Without context

With context

mergeConfig usage

100%

Correct import source

100%

globals enabled

100%

Node environment

100%

fileParallelism enabled

100%

Coverage provider

100%

Coverage reporters

100%

Coverage include filter

100%

Coverage thresholds

100%

Pool configured

100%

Coverage include sources

Without context: $0.3250 · 1m 16s · 16 turns · 249 in / 4,323 out tokens

With context: $0.7275 · 2m 6s · 31 turns · 31 in / 7,233 out tokens

68%

-3%

Testing a Weather API Client with Mocked Dependencies

Module mocking patterns

Criteria

Without context

With context

vi.mock hoisted

100%

vi.hoisted usage

Partial mock with importOriginal

Spy-mode mock

30%

vi.doMock usage

100%

vi.stubEnv usage

100%

vi.mocked TypeScript helper

100%

Mock return values

100%

toHaveBeenCalledWith assertions

100%

vi.unstubAllEnvs cleanup

100%

Without context: $0.4450 · 1m 46s · 18 turns · 18 in / 6,463 out tokens

With context: $1.1553 · 4m 30s · 33 turns · 1,887 in / 16,488 out tokens

76%

56%

Comprehensive Test Suite for an In-Memory Task Queue

Advanced test patterns and fixtures

Criteria

Without context

With context

test.for usage

No test.each

test.concurrent with context expect

83%

test.extend fixture

100%

Fixture teardown

100%

onTestFinished usage

100%

expect.soft usage

100%

expect.poll usage

100%

Fixture dependency injection

100%

Without context: $0.8411 · 3m 59s · 22 turns · 21 in / 16,569 out tokens

With context: $0.4887 · 1m 38s · 23 turns · 19 in / 5,491 out tokens

Evaluated: 3 days ago
Agent: Claude Code

Table of Contents

Vitest Setup for a Vite + TypeScript Project Testing a Weather API Client with Mocked Dependencies Comprehensive Test Suite for an In-Memory Task Queue

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