I have a file with object that gets populated with process.env
properties:
env.js
console.log('LOADING env.js');
const {
PROXY_PREFIX = '/api/',
USE_PROXY = 'true',
APP_PORT = '8080',
API_URL = 'http://ift.tt/2zURGru',
NODE_ENV = 'production',
} = process.env;
const ENV = {
PROXY_PREFIX,
USE_PROXY,
APP_PORT,
API_URL,
NODE_ENV,
};
module.exports.ENV = ENV;
Now I try to test this file with different process.env
properties:
env.test.js
const envFilePath = '../../config/env';
describe('environmental variables', () => {
const OLD_ENV = process.env;
beforeEach(() => {
process.env = { ...OLD_ENV };
delete process.env.NODE_ENV;
});
afterEach(() => {
process.env = OLD_ENV;
});
test('have default values', () => {
const { ENV } = require(envFilePath);
expect(ENV).toMatchSnapshot();
});
test('are string values (to avoid casting errors)', () => {
const { ENV } = require(envFilePath);
Object.values(ENV).forEach(val => expect(typeof val).toEqual('string'));
});
test('will receive process.env variables', () => {
process.env.NODE_ENV = 'dev';
process.env.PROXY_PREFIX = '/new-prefix/';
process.env.API_URL = 'https://new-api.com/';
process.env.APP_PORT = '7080';
process.env.USE_PROXY = 'false';
const { ENV } = require(envFilePath);
expect(ENV.NODE_ENV).toEqual('dev');
expect(ENV.PROXY_PREFIX).toEqual('/new-prefix/');
expect(ENV.API_URL).toEqual('https://new-api.com/');
expect(ENV.APP_PORT).toEqual('7080');
expect(ENV.USE_PROXY).toEqual('false');
});
});
Unfortunately, even though I try to load the file in every test separately the file gets loaded only once, making the third test fail with:
Expected value to equal: "dev" Received: "production"
I also know that because console.log('LOADING env.js');
gets fired only once.
I tried to invalidate Nodes cache like:
beforeEach(() => {
delete require.cache[require.resolve(envFilePath)];
process.env = { ...OLD_ENV };
delete process.env.NODE_ENV;
});
but require.cache
is empty {}
before each test so it seems that Jest is somehow responsible for importing the file.
I also tried to run yarn test --no-cache
but didn't help.
So what I want is to load env.js before each test so I can test how it behaves with different node environmental variables.
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