Help with Sinon unit tests on ES6 function using React context

I have the following file that I am trying to write unit tests for: ---- [login to view URL] ----- import context from "../context"; function getProvider() { let provider = (context && [login to view URL]) || null; if (!provider) { provider = { provide: function() { } }; } return provider; }; export const provider = getProvider(); ------------------ The problem is that I am unable to mock the React context, so it always falls into the null case. ---- [login to view URL] ----- import {describe, it, beforeEach, afterEach} from "intern!bdd"; import {expect} from "intern/chai!"; import sinon from "sinon"; import * as provider from "src/js/provider"; describe(" provider with context", () => { let loggingSpy; beforeEach(() => { }); afterEach(() => { [login to view URL](); }); it("should log a message", () => { loggingSpy = [login to view URL](provider, "provide"); [login to view URL]("something"); expect([login to view URL]).[login to view URL](true); }); }); ----------------- How do I pass in the React context to the provider in the unit test?