fix: WIP on spies

A push for @sniperadmin to help on with spies for plain
JavaScript files

Author: BKristenssonAlfsson

Diff for: tests/unit/remote/peer-fetch.spec.js

@@ -0,0 +1,14 @@
+import PeerFetch from '../../../src/remote/peer-fetch.js'
+
+beforeAll(() => {
+  jest.spyOn(PeerFetch.prototype, '_drawNewTicket').mockImplementation(() => '12');
+});
+
+afterAll(() => {
+  jest.restoreAllMocks();
+});
+
+test('Modify class', () => {
+  let peer = new PeerFetch();
+    expect(peer._drawNewTicket()).toBe("12");
+});