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>

package.json

@@ -9,7 +9,7 @@
   },
   "private": true,
   "dependencies": {
-    "@fluxerjs/core": "^1.1.5",
+    "@fluxerjs/core": "^1.2.2",
     "dotenv": "^17.3.1",
     "pg": "^8.18.0",
     "pg-hstore": "^2.3.4",
@@ -21,8 +21,11 @@
     "@babel/core": "^7.29.0",
     "@babel/plugin-transform-modules-commonjs": "^7.28.6",
     "@babel/preset-env": "^7.29.0",
+    "@fetch-mock/jest": "^0.2.20",
     "babel-jest": "^30.2.0",
-    "jest": "^30.2.0"
+    "fetch-mock": "^12.6.0",
+    "jest": "^30.2.0",
+    "jest-fetch-mock": "^3.0.3"
   },
   "scripts": {
     "test": "jest"