From aj-geddes-useful-ai-prompts-4
Writes unit tests with high coverage using Jest, pytest, JUnit, RSpec following AAA pattern. Use for functions, classes, components, TDD, refactoring, coverage.
npx claudepluginhub joshuarweaver/cascade-code-languages-misc-1 --plugin aj-geddes-useful-ai-prompts-4This skill uses the workspace's default tool permissions.
- [Overview](#overview)
Searches, retrieves, and installs Agent Skills from prompts.chat registry using MCP tools like search_skills and get_skill. Activates for finding skills, browsing catalogs, or extending Claude.
Searches prompts.chat for AI prompt templates by keyword or category, retrieves by ID with variable handling, and improves prompts via AI. Use for discovering or enhancing prompts.
Checks Next.js compilation errors using a running Turbopack dev server after code edits. Fixes actionable issues before reporting complete. Replaces `next build`.
Write effective unit tests that are fast, isolated, readable, and maintainable following industry best practices and AAA (Arrange-Act-Assert) pattern.
Minimal working example:
// Jest/JavaScript example
describe("UserService", () => {
describe("createUser", () => {
it("should create user with valid data", async () => {
// Arrange - Set up test data and dependencies
const userData = {
email: "john@example.com",
firstName: "John",
lastName: "Doe",
};
const mockDatabase = createMockDatabase();
const service = new UserService(mockDatabase);
// Act - Execute the function being tested
const result = await service.createUser(userData);
// Assert - Verify the outcome
expect(result.id).toBeDefined();
expect(result.email).toBe("john@example.com");
expect(mockDatabase.save).toHaveBeenCalledWith(
expect.objectContaining(userData),
);
});
});
});
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| Test Structure (AAA Pattern) | Test Structure (AAA Pattern) |
| Test Cases by Language | Test Cases by Language |
| Mocking & Test Doubles | Mocking & Test Doubles |
| Testing Async Code | Testing Async Code, Test Coverage |
| Testing Edge Cases | Testing Edge Cases |
| Example: Complete Test Suite | import { UserService } from "./user-service"; |