So recently I need to unit test some js code but this code used the window.location.host variable, and in order to fully test the logic I had to mock the window.location global var.

In case anyone ever has to do something similar here is a snippet that works with QUnit:

test( "test initial mocks", function() { custom_window = { location: { host: "test.asu.edu" } }; (function(window) { equal( window.location.host, "test.asu.edu", "we expect test.asu.edu to be in the window.host mock" ); })(custom_window); });