I am trying to test a class which returns values depending on values present in window object.
window.test = 123;
I want to mock the window object's test property to 123 value to be able to test correctly.
I tried Object.defineProperty, using global instead, but nothing seems to work. Seems like a trivial question but not able to find the answer on google or elsewhere. Please advice.
In case window exists (i.e. Jest runs with JSDOM, which is done by default) it should be:
beforeEach(() => {
window.test = 123;
});
afterEach(() => {
delete window.test;
});
In case it doesn't exist, it's:
beforeEach(() => {
global.window = { test: 123 };
});
afterEach(() => {
delete global.window;
});
Depending on whether window is used elsewhere, it may be beneficial to back it up to temporary variable in beforeEach and restore in afterEach.
