jestjs - Jest "No Environment is configured" problem when import a javascript file,which uses environemnt variables

Question

I am using jest to write unit test for my javascript functions (running with nodejs), I am very new to jest, if someone out here can help me, it will be appreciated! Here are the situations: file1.js is the file with functions I need to test, it includes some functions/statement that using environemnt varaibles. file1.test.js is the testing file for file1.js

when I use const file1 = require("file1.js"), it complains "No Environment is Configured."

I did the following: const OLD_ENV = process.env;

beforeEach(() => 
{
    jest.resetModules(); // most important - it clears the cache
    process.env = { ...OLD_ENV }; // make a copy
});

afterAll(() => 
{
    process.env = OLD_ENV; // restore old env
});

But it does not help. I tried to do something like this:

test("simple test", ()=>
{
    const file1 = require("file1.js");
    ...
    expect(...)
});

It also have same problem.

Anyone have any thought? Thanks, Gordon

question from:https://stackoverflow.com/questions/65906627/jest-no-environment-is-configured-problem-when-import-a-javascript-file-which

Answer 1

Waitting for answers