test-suite-generator

Testing & Quality

Generates comprehensive test suites for components, hooks, and utilities with proper mocking and assertions.

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Test Suite Generator Skill

When to Use

User needs tests for a new component
User wants to add tests for utility functions
User needs integration tests for API routes
User asks to set up testing patterns

What This Skill Does

Determines appropriate test types (unit, integration, e2e)
Sets up test files with proper structure
Creates mocks for dependencies
Writes comprehensive test cases
Adds edge case coverage

Component Testing Pattern

import { render, screen, fireEvent } from '@testing-library/react-native';
import { ActivityCard } from './ActivityCard';
import type { Activity } from '@repo/core';

describe('ActivityCard', () => {
  const mockActivity: Activity = {
    id: '1',
    name: 'Morning Run',
    type: 'run',
    distance: 5000,
    duration: 1800,
    startTime: new Date(),
  };

  it('renders activity name and stats', () => {
    render(<ActivityCard activity={mockActivity} />);

    expect(screen.getByText('Morning Run')).toBeTruthy();
    expect(screen.getByText('5.00 km')).toBeTruthy();
    expect(screen.getByText('30:00')).toBeTruthy();
  });

  it('calls onPress when pressed', () => {
    const onPress = jest.fn();
    render(<ActivityCard activity={mockActivity} onPress={onPress} />);

    fireEvent.press(screen.getByRole('button'));
    expect(onPress).toHaveBeenCalledWith('1');
  });
});

Hook Testing Pattern

import { renderHook, waitFor } from "@testing-library/react-native";
import { useActivityRecorder } from "./useActivityRecorder";

describe("useActivityRecorder", () => {
  it("starts in ready state", () => {
    const { result } = renderHook(() => useActivityRecorder("running"));

    expect(result.current.state).toBe("ready");
  });

  it("transitions to recording when started", async () => {
    const { result } = renderHook(() => useActivityRecorder("running"));

    act(() => {
      result.current.start();
    });

    await waitFor(() => {
      expect(result.current.state).toBe("recording");
    });
  });
});

Utility Function Testing

import { calculateTSS } from "./calculations";

describe("calculateTSS", () => {
  it("calculates TSS correctly for 1 hour at FTP", () => {
    const tss = calculateTSS({
      normalizedPower: 250,
      duration: 3600,
      ftp: 250,
    });

    expect(tss).toBe(100);
  });

  it("returns 0 for zero duration", () => {
    const tss = calculateTSS({
      normalizedPower: 250,
      duration: 0,
      ftp: 250,
    });

    expect(tss).toBe(0);
  });
});

Test Coverage Requirements

Happy path tests
Edge cases (null, undefined, empty)
Error conditions
Boundary values
Async operations
User interactions