feat: Add unit tests (#21)

Tests are mostly complete (though some are failing -- to be fixed in the
async/await refactor.

Also refactored, fixed bugs found while testing, and added ability to
type `pf;m` instead of `pf;member`.

---------

Co-authored-by: Aster Fialla <asterfialla@gmail.com>

tests/helpers/utils.test.js

@@ -0,0 +1,19 @@
+const {enums} = require("../../src/enums");
+
+const fetchMock = require('jest-fetch-mock');
+fetchMock.enableMocks();
+
+const {utils} = require("../../src/helpers/utils.js");
+
+describe('utils', () => {
+
+    beforeEach(() => {
+        jest.resetModules();
+        jest.clearAllMocks();
+    })
+
+    afterEach(() => {
+        // restore the spy created with spyOn
+        jest.restoreAllMocks();
+    });
+})