test-data-generation
Generate realistic, consistent test data using factories, fixtures, and fake data libraries. Use for test data, fixtures, mock data, faker, test builders, and seed data generation.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/aj-geddes/useful-ai-prompts --skill test-data-generation- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads test-data-generation automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Test Data Generation
Table of Contents
Overview
Test data generation creates realistic, consistent, and maintainable test data for automated testing. Well-designed test data reduces test brittleness, improves readability, and makes it easier to create diverse test scenarios.
When to Use
- Creating fixtures for integration tests
- Generating fake data for development databases
- Building test data with complex relationships
- Creating realistic user inputs for testing
- Seeding test databases
- Generating edge cases and boundary values
- Building reusable test data factories
Quick Start
Minimal working example:
// tests/factories/userFactory.js
const { faker } = require("@faker-js/faker");
class UserFactory {
static build(overrides = {}) {
return {
id: faker.string.uuid(),
email: faker.internet.email(),
firstName: faker.person.firstName(),
lastName: faker.person.lastName(),
age: faker.number.int({ min: 18, max: 80 }),
phone: faker.phone.number(),
address: {
street: faker.location.streetAddress(),
city: faker.location.city(),
state: faker.location.state(),
zip: faker.location.zipCode(),
country: "USA",
},
role: "user",
isActive: true,
createdAt: faker.date.past(),
...overrides,
};
}
// ... (see reference guides for full implementation)
Reference Guides
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| Factory Pattern for Test Data | Factory Pattern for Test Data |
| Builder Pattern for Complex Objects | Builder Pattern for Complex Objects |
| Fixtures for Integration Tests | Fixtures for Integration Tests |
| Realistic Data Generation | Realistic Data Generation |
Best Practices
✅ DO
- Use faker libraries for realistic data
- Create reusable factories for common objects
- Make factories flexible with overrides
- Generate unique values where needed (emails, IDs)
- Use builders for complex object construction
- Create fixtures for integration test setup
- Generate edge cases (empty strings, nulls, boundaries)
- Keep test data deterministic when possible
❌ DON'T
- Hardcode test data in multiple places
- Use production data in tests
- Generate truly random data for reproducible tests
- Create overly complex factory hierarchies
- Ignore data relationships and constraints
- Generate massive datasets for simple tests
- Forget to clean up generated data
- Use the same test data for all tests
FAQ
What does the test-data-generation skill do?
Generate realistic, consistent test data using factories, fixtures, and fake data libraries. Use for test data, fixtures, mock data, faker, test builders, and seed data generation.
How do I install test-data-generation?
Run npx skills add https://github.com/aj-geddes/useful-ai-prompts --skill test-data-generation in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/test-data-generation/ (personal) or .claude/skills/test-data-generation/ (project).
Which AI agents can use test-data-generation?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is test-data-generation safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains test-data-generation?
It is published by aj-geddes in aj-geddes/useful-ai-prompts. It has 496 recorded installs.
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