react-native-jest-environment


Provides an API in JS to access a React Native Jest runtime, so that you don't
have to use the jest CLI to be able to use Jest's great React Native mocking.

Usage

``js
import getJestEnvironment from "react-native-jest-environment";
import renderer from "react-test-renderer";

// Any optional mocks that might reach into native
// Think jest.mock()
const mocks = { StatusBar: () => "StatusBar" };
getJestEnvironment(mocks).then(mockRequire => {
const Component = mockRequire(__dirname, "../path/to/component");
const render = renderer.create().toJSON();
// ...
});
`

Cucumber

This was originally made for use with
cucumber.js!

A convenient way to access the mockRequire in your step definitions is to
load the Jest environment in a Before hook in a support file:

`js
import * as path from "path";
import getJestEnvironment from "react-native-jest-environment";

module.exports = function() {
this.Before(function() {
const mocks = { StatusBar: () => "StatusBar" };
return getJestEnvironment(mocks).then(mockRequire => {
// Base all requires off the source path
const srcPath = path.resolve(__dirname, "../test-src");
this.require = mockRequire.bind(null, srcPath);
});
});
};
`

And then in a step...

`js
import React from "react";
import renderer from "react-test-renderer";
import { expect } from "chai";

module.exports = function() {
this.Given("a component", function() {
const Component = this.require("component").default;
this.component = renderer.create();
});

this.Then("it has a property", function() {
expect(this.component.toJSON().props.x).to.equal("hi");
});
};
``