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| name | unit-test |
| description | Run and write Jest unit tests following Middle Earth patterns. |
Run and write Jest unit tests following Middle Earth patterns.
# Test a specific project
pnpm nx test <project-name>
# Test all projects
pnpm nx run-many --target test
Tests are colocated with source in __tests__/ directories:
src/lib/
├── my-component.ts
├── __tests__/
│ └── my-component.spec.ts
React components (Testing Library):
import { render, screen } from '@testing-library/react';
import { Button } from '../button';
describe('Button', () => {
it('renders with label', () => {
render(<Button>Click me</Button>);
expect(screen.getByText('Click me')).toBeInTheDocument();
});
});
Table-driven tests:
it.each([
['valid input', validData, true],
['invalid input', invalidData, false],
])('validates %s', (_, input, expected) => {
expect(isValid(input)).toBe(expected);
});
.only in tests (disallowed by lint rule)any type assertionsAim for 100% coverage where feasible. Use expect.objectContaining for flexible assertions.