Let's say I'm importing to Jest module like:
let var;
export const getVar = () => {
if(var == null) {
var = Date.now()
}
return var;
}
I am trying to make unit tests for this module, however, on every unit test I have to reset the "var" value. I've tried to redefine the module using require on "beforeEach" method but it does not work. Does anyone know how to reset encapsulated values like this?
require syntax and resetModulesfoo.js
let foo;
const getFoo = () => {
if (!foo) {
foo = "foo";
} else {
foo = "bar";
}
return foo;
};
module.exports = { getFoo };
foo.test.js
beforeEach(() => jest.resetModules());
test("first", () => {
const { getFoo } = require("./foo");
expect(getFoo()).toBe("foo");
});
test("second", () => {
const { getFoo } = require("./foo");
expect(getFoo()).toBe("foo");
});
import and resetModulesfoo.js
let foo;
export const getFoo = () => {
if (!foo) {
foo = "foo";
} else {
foo = "bar";
}
return foo;
};
foo.test.js
import { jest } from "@jest/globals";
beforeEach(async () => {
jest.resetModules();
});
test("first", async () => {
const { getFoo } = await import("./foo.js");
expect(getFoo()).toBe("foo");
});
test("second", async () => {
const { getFoo } = await import("./foo.js");
expect(getFoo()).toBe("foo");
});