gherkin-jest

Now you can run tests written in gherkin using jest.

Usage

First, install:

$ yarn add --dev gherkin-jest

Then, add to your jest config:

``json
"transform": {
"^.+\\.feature$": "gherkin-jest"
},
"setupFiles": ["/test/support"],
"testMatch": ["/.test.ts", "/.feature"],
"moduleFileExtensions": ["js", "jsx", "ts", "tsx", "feature"],
`

Define your steps in the setup file:

`js
const { cucumber } = require('gherkin-jest');

cucumber.defineCreateWorld(() => {
return {
a: null,
b: null,
answer: null
}
})

cucumber.defineRule('I have numbers {int} and {int}', (world, a, b) => {
world.a = a;
world.b = b;
});

cucumber.defineRule('I add them', (world) => {
world.answer = world.a + world.b;
});

cucumber.defineRule('I get {int}', (world, answer) => {
expect(world.answer).toBe(answer);
});
`

Write a test:

`gherkin
Feature: using feature files in jest
As a developer
I want to write tests in cucumber
So that the business can understand my tests

Scenario: a simple arithmetic test
Given I have numbers 3 and 4
When I add them
Then I get 7
``

More documentation

This package just wraps the stucumber package to make a
Jest transformer. More details on the flavour of Gherkin used and how to set up supporting code can
be found in that package's documentation.