fix a test that should've always failed reallyI guess node 15 is stri…

…cter about some things

test/specs/config/fallbackToNetwork.test.js

@@ -13,9 +13,11 @@ describe('fallbackToNetwork', () => {
 	});
 
 	it('not error when configured globally', async () => {
+		theGlobal.fetch = async () => ({ status: 202 });
 		fm.config.fallbackToNetwork = true;
 		fm.mock('http://mocked.com', 201);
 		expect(() => fm.fetchHandler('http://unmocked.com')).not.to.throw();
+		delete theGlobal.fetch
 	});
 
 	it('actually falls back to network when configured globally', async () => {
@@ -26,6 +28,7 @@ describe('fallbackToNetwork', () => {
 		expect(res.status).to.equal(202);
 		fetchMock.restore();
 		fetchMock.config.fallbackToNetwork = false;
+		delete theGlobal.fetch
 	});
 
 	it('actually falls back to network when configured in a sandbox properly', async () => {