gherkin-jest
v0.24.0
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Run tests written in gherkin with jest
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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:
"transform": {
"^.+\\.feature$": "gherkin-jest"
},
"setupFiles": ["<rootDir>/test/support"],
"testMatch": ["**/*.test.ts", "**/*.feature"],
"moduleFileExtensions": ["js", "jsx", "ts", "tsx", "feature"],
Define your steps in the setup file:
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:
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.