Reddit
reddit.com › r/node › app not reading .env files when testing through jest
r/node on Reddit: App not reading .env files when testing through Jest
June 15, 2022 -
I have a Jest test setup to test APIs (using supertest), which leads to an error on account of API being tested not being able to read the variables in an .env file.
But when I test the same API thorough Postman, it works fine and I can see the variables are loaded correctly in the console.
So, essentially the same code works differently (can read .env file in one case and not in the other) when tested through Jest and when tested manually through Postman. What could be reason for this?
I'm loading the .env file via the CLI option. That is: 'node -r dotenv/config index.js".
Top answer 1 of 4
2
You need to use dontenv in your jest.config.js file. Just add at beginning: const dotenv = require("dotenv"); dotenv.config({ path: "__tests__/.env" });
2 of 4
2
Add setupFilesAfterEnv to your jest config "setupFilesAfterEnv": ["dotenv/config"] This will make jest to load your .env for every test
GitHub
github.com › jestjs › jest › issues › 6634
@jest-environment node not working · Issue #6634 · jestjs/jest
July 5, 2018 - 🐛 Bug Report Related to #5119 Decorating my test file with @jest-environment node on top of it doesn't work and typeof window returns "object" instead of "undefined". To Reproduce Create a js file to be tested like this: console.log(type...
Author jestjs
[Feature]: Allow `@jest-environment` pragma to be below other comments
🚀 Feature Proposal Allow the /** * @jest-environment jsdom */ To not be strictly the first comment node. Motivation Docusaurus has a very strict eslint header config that only allows: /** * Copyrig... More on github.com
10
March 12, 2022node.js - Using environment variables in Node and Jest - Stack Overflow
I do in fact properly use Heroku's ... env=node to work properly. ... Pass the env arg to Jest. jest -- --env=dev. ... @morganney If I do that, for some reason, Jest finds no tests to run. Either way, it won't help me run individual tests ie through VS Code Extension test runners. ... Mocking out environment variables ... More on stackoverflow.com
@jest-environment jsdom not working
I'd like to report a bug. What is the current behavior? When setting the jest environment to node in the package.json and using the @jest-environment jsdom docblock in a UI test, jsdom is not a... More on github.com
7
April 11, 2017jestjs - Set custom Jest environment in docblock - Stack Overflow
Yes, you can set a custom environment for a single Jest test using the docblock syntax. If your custom environment is installed as a package in node_modules you can just use the module name. Alternatively, if your custom environment is defined in a file within your project you can use the path to that file (in this case my-custom-env.js in the root directory of the project): ... Sign up to request clarification or add additional context in comments... More on stackoverflow.com
Videos
09:41
Introduction to Testing with Jest in Node.js | JavaScript & ...
09:11
Setting Up Node.js Project with TypeScript and Jest: Step-by-Step ...
25:40
Guide to Testing Node.js Applications with Jest and TypeScript ...
10:56
Jest tutorial with Node | testing Node.js applications - YouTube
GitHub
github.com › jestjs › jest › issues › 5119
@jest-environment node not working in v22 · Issue #5119 · jestjs/jest
December 18, 2017 - Seeing this error message: TypeError: environment.setup is not a function at node_modules/jest-runner/build/run_test.js:112:23 When using this syntax at the top of the test file (worked in v21): /** * @jest-environment node */
Author jestjs
GitHub
github.com › jestjs › jest › issues › 12573
[Feature]: Allow `@jest-environment` pragma to be below other comments · Issue #12573 · jestjs/jest
March 12, 2022 - 🚀 Feature Proposal Allow the /** * @jest-environment jsdom */ To not be strictly the first comment node. Motivation Docusaurus has a very strict eslint header config that only allows: /** * Copyright (c) Facebook, Inc. and its affiliates...
Author jestjs
DEV Community
dev.to › chukwutosin_ › using-environment-variables-when-testing-with-jest-in-nodejs-124d
How to use environment variables when testing with Jest in NodeJs - DEV Community
March 11, 2021 - I'm using dotenv for the environment variables and jest for testing and all you need to do is add the dotenv config to the jest setup files in your package.json file.
Testing JavaScript
testingjavascript.com › lessons › jest-configure-jest-s-test-environment-for-testing-node-or-browser-code
Configure Jest’s Test Environment for Testing Node or Browser Code
In our application we’re testing code that should run in the browser, but Jest is intended to test JavaScript that runs in the browser or in node. Let’s create a custom jest config file so we can customize the test environment.
npm
npmjs.com › package › jest-environment-node
jest-environment-node - npm
May 8, 2026 - Latest version: 30.4.1, last published: 25 days ago. Start using jest-environment-node in your project by running `npm i jest-environment-node`. There are 1186 other projects in the npm registry using jest-environment-node.
» npm install jest-environment-node
Published May 08, 2026
Version 30.4.1
Jest
jestjs.io › environment variables
Environment Variables · Jest
May 7, 2026 - Jest sets the following environment variables: Set to 'test' if it's not already set to something else. Each worker process is assigned a unique id (index-based that starts with 1). This is set to 1 for all tests when runInBand is set to true. NODE_ENV ·
Stack Overflow
stackoverflow.com › questions › 72592581 › using-environment-variables-in-node-and-jest
node.js - Using environment variables in Node and Jest - Stack Overflow
I do in fact properly use Heroku's secrets for my actual important env variables like API keys, etc, but I now seem to be stuck here on how I should tell Jest what env it is in, since it needs env=node to work properly. ... Pass the env arg to Jest. jest -- --env=dev. ... @morganney If I do that, for some reason, Jest finds no tests to run. Either way, it won't help me run individual tests ie through VS Code Extension test runners. ... Mocking out environment variables in Jest is a little bit more tricky as there really is no way to mock them out before the code that you want to import gets evaluated.
Edge Runtime
edge-runtime.vercel.app › packages › jest-environment
Edge Runtime Jest Environment | Edge Runtime
Jest enables you to define the test environment through a code comment (opens in a new tab) or as a CLI option (opens in a new tab). For example, the following test would pass: // jest --env node // ✅ Pass it('should return the correct value', () => { let val = eval('2 + 2') expect(val).toBe(4) }) The following test would fail when using the Edge Runtime: // jest --env @edge-runtime/jest-environment // ❌ Fail // Error name: "EvalError" // Error message: "Code generation from strings disallowed for this context" it('should return the correct value', () => { let val = eval('2 + 2') expect(val).toBe(4) }) @edge-runtime/format@edge-runtime/jest-expect
Jest
jestjs.io › configuring jest
Configuring Jest · Jest
May 8, 2026 - Use the <rootDir> string token to include the path to your project's root directory to prevent it from accidentally ignoring all of your files in different environments that may have different root directories. ... An alternative API to setting the NODE_PATH env variable, modulePaths is an array of absolute paths to additional locations to search when resolving modules. Use the <rootDir> string token to include the path to your project's root directory. ... Activates native OS notifications for test results. To display the notifications Jest needs node-notifier package, which must be installed additionally:
GitHub
github.com › jestjs › jest › issues › 3280
@jest-environment jsdom not working · Issue #3280 · jestjs/jest
April 11, 2017 - I'd like to report a bug. What is the current behavior? When setting the jest environment to node in the package.json and using the @jest-environment jsdom docblock in a UI test, jsdom is not available. If the current behavior is a bug, ...
Author jestjs
Stack Overflow
stackoverflow.com › questions › 70362671 › why-jest-is-not-letting-me-use-node-testing-environment-even-though-they-changed
Why Jest is not letting me use node testing environment even though they changed it themselves?
Sorry, but im very lost, how come the default testing environment that jest comes with can't render the simple react component, what else are developers supposed to test it? ... Because the default test environment is now Node, which is for... a Node environment. Not the DOM environment, which is where React (however simple a component) runs.
DEV Community
dev.to › darkmavis1980 › how-to-mock-environmental-variables-with-jest-2j3c
How to mock environment variables with Jest - DEV Community
November 25, 2021 - If you use Jest as your trusty testing framework for your Node.js application, you probably ended up in the situation where the code you are trying to test, uses environmental variables that you access with process.env. The simplest way to do is to create a file, to be called setEnvVars.js, and to populate it with the env variables you need, for example: // .jest/setEnvVars.js process.env.SOME_VAR = 'something'; process.env.SECRET = 'shh-do-not-tell-to-anyone'; // etc...
Yarn
yarnpkg.com › package
Yarn
Yarn is a package manager that doubles down as project manager. Whether you work on simple projects or industry monorepos, whether you're an open source developer or an enterprise user, Yarn has your back · First package manager built specifically around workspaces, Yarn lets you split your ...
Top answer 1 of 7
99
Make sure you have both packages jest and jest-environment-jsdom installed in the same version. The latter is required to be installed separately from jest version 28 on. I ran into the same issue when downgrading jest to 27.x but not jest-environment-jsdom. Have a look at the version 27 to 28 upgrade guide about using JSDOM test environment.
2 of 7
9
I had different versions of local jest and global jest, jest-environment-jsdom was not installed globally. This caused me the issues. Running it locally via
./node_modules/jest/bin/jest.js src/my-test.spec.ts
or updating global jest packages did the job for me. I see that this is mentioned in one of the comments above, but somehow I missed it and spent too much time on it so posting it here
Top answer 1 of 4
30
Jest automatically defines environment variable NODE_ENV as test(see https://jestjs.io/docs/environment-variables), as you can confirm from your error message:
console.error node_modules/config/lib/config.js:1727
WARNING: NODE_ENV value of 'test' did not match any deployment config file names.
What you can do is simply create config/test.json and include the contents {}, which is an empty valid JSON object.
See https://github.com/lorenwest/node-config/wiki/Strict-Mode
Note: the aforementioned error occurs when you use the config package, and meanwhile you don't have the test.json file in the config directory.
2 of 4
5
The easiest way is using cross-env package:
npm install --save-dev cross-env
Then, you can use it in your package.json:
"scripts": {
"test": "cross-env NODE_ENV=development jest --config jest.config.json"
}
Medium
medium.com › @yiqun.rong2 › jest-test-lifecycle-and-test-environment-06cfbf90f612
Jest test lifecycle and test environment | by Rong | Medium
December 3, 2023 - We can also create custom test environments in Jest. This is useful if you have specific requirements that are not met by the built-in environments. For example, you might want to create a test environment that includes certain polyfills or mocks specific global functions in a certain way. A custom environment is a JavaScript class that extends one of the built-in environments and overrides its methods. Here’s a basic structure of a custom environment: const NodeEnvironment = require('jest-environment-node'); class MyCustomEnvironment extends NodeEnvironment { constructor(config) { super(con
Jest
jestjs.io › test environment
Test Environment · Jest
May 7, 2026 - To have more fine-grained control, you can use docblock pragmas to specify environment for specific files. Docblock pragmas are comments that start with @jest-environment and are followed by the environment name: ... Jest allows you to extend the built-in environments, such as NodeEnvironment or JSDOMEnvironment, to create your own custom environment.