ReddRadar
Agent skill
testing-patterns
Vitest testing patterns and strategies for unit tests, agent tests, and API tests with Supabase mocking
Install this agent skill to your Project
npx add-skill https://github.com/aiskillstore/marketplace/tree/main/skills/cleanexpo/testing-patterns
SKILL.md
Testing Patterns Skill
Vitest Testing Strategy
When to Use: Writing tests for new features, agents, API routes
Framework: Vitest
Command: npm run test
Required: 100% pass rate
Location: tests/ directory
Unit Test Pattern
import { describe, it, expect, vi, beforeEach } from 'vitest';
import { MyService } from '@/lib/services/my-service';
describe('MyService', () => {
let service: MyService;
beforeEach(() => {
vi.clearAllMocks();
service = new MyService();
});
it('should process data correctly', () => {
const input = { value: 42 };
const result = service.process(input);
expect(result).toBeDefined();
expect(result.value).toBe(42);
});
it('should handle errors', () => {
expect(() => service.process(null)).toThrow();
});
});
Agent Test Pattern
import { describe, it, expect, vi } from 'vitest';
import { MyAgent } from '@/lib/agents/my-agent';
// Mock Supabase
vi.mock('@supabase/supabase-js', () => ({
createClient: vi.fn(() => ({
from: vi.fn(() => ({
select: vi.fn().mockReturnThis(),
eq: vi.fn().mockResolvedValue({ data: [], error: null })
}))
}))
}));
describe('MyAgent', () => {
it('processes task successfully', async () => {
const agent = new MyAgent();
const task = {
id: 'test-1',
workspace_id: 'ws-123',
task_type: 'test',
payload: {},
priority: 5,
retry_count: 0,
max_retries: 3
};
const result = await agent.processTask(task);
expect(result).toBeDefined();
});
});
API Test Pattern
import { describe, it, expect } from 'vitest';
import { GET } from '@/app/api/my-endpoint/route';
import { NextRequest } from 'next/server';
describe('GET /api/my-endpoint', () => {
it('requires workspace_id', async () => {
const req = new NextRequest('http://localhost:3008/api/my-endpoint');
const response = await GET(req);
const data = await response.json();
expect(response.status).toBe(400);
expect(data.error).toContain('workspaceId required');
});
});
Mocking Supabase
const mockSelect = vi.fn().mockReturnThis();
const mockEq = vi.fn().mockReturnThis();
const mockInsert = vi.fn().mockReturnThis();
const mockFrom = vi.fn(() => ({
select: mockSelect,
eq: mockEq,
insert: mockInsert
}));
vi.mock('@supabase/supabase-js', () => ({
createClient: vi.fn(() => ({
from: mockFrom
}))
}));
// Set return values
mockEq.mockResolvedValue({ data: [{ id: '1', name: 'Test' }], error: null });
Coverage Requirements
- Unit Tests: All services, utilities, helpers
- Integration Tests: API routes, agent workflows
- E2E Tests: Critical user flows (Playwright)
Target: 100% pass rate (no failures allowed)
Standard: All code must have tests, all tests must pass
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