jest-fp-ts-matchers

Collection of monad matchers to ease testing with Jest

Installation

npm install -D jest-fp-ts-matchers

Quick start

import { expectLeftEither } from 'jest-fp-ts-matchers';

test('returns left Either when parsing fails', () => {
  pipe(
    Parser.parse({ id: '' }),
    expectLeftEither((err) => {
      expect(err).toBeInstanceOf(Error);
      expect(err.message).toMatch(/001/);
    })
  );
});

Exported methods

• expectLeftEither
• expectRightEither
• expectLeftΙΟEither
• expectRightΙΟEither
• expectLeftTaskEither
• expectRightTaskEither
• expectLeftReaderTaskEither
• expectRightReaderTaskEither
• expectSomeOption
• expectNoneOption

Requirements

• Node.js v.16+

License

MIT