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to-ava

Codemod to convert tests written in jest to ava.

Check fixtures/ folder to see some example.

Usage

Install

npm i -g to-ava

Run it on a Javascript file

to-ava ./jest.test.js

Run it on a Typescript file

to-ava -p=ts ./jest.test.ts

Run it on a folder

to-ava -p=ts ./tests

Notes

It excludes files that are not test files. A file is supposed to contain tests if its name includes either test. either spec.

Support

Supported Assertions

  • .toEqual
  • .toBe
  • .toBeNull
  • .toBeFalsy
  • .toBeTruthy
  • .toMatchSnapshot
  • .toBeDefined
  • .toBeUndefined
  • .toBeInstanceOf
  • .toBeGreaterThan
  • .toBeGreaterThanOrEqual
  • .toBeLessThan
  • .toBeLessThanOrEqual
  • .toHaveLength
  • .toHaveProperty

Other things supported

  • test.each()
  • trasnformation of test hooks (before(), beforeEach(), after(), afterAll())

Assertions not supported

All the other assertions are not supported. Including all the assertions used in combination with .not - for example .not.toBeDefined()

Those assertions will be still transformed, however not into an ava assertion, but as a comment with the "TODO: " symbol. Thanks for the "TODO: " symbol, it will be possible to find all the assertions not transformed, and fix them manually.

For example

expect(res).toContain('0')

// will be transformed into

// TODO: expect(res).toContain('0');

Other things not supported

  • nested describe() - require manual rewriting of jest tests in order to remove nested describe()
  • skipped tests describe.skip(), it.skip()

Test

npm t

TODO

  • add support for beforeEach, beforeAll, afterEach, afterAll
  • refactor: split the transformer into multiple functions, with clear names
  • add support for more jest assertion. The list follows:
    • .not.toBeDefined
    • .not.toBeNull
    • .not.toContain
    • .not.toEqual
  • add support for nested describes

Resources