add mocha for tests

package-lock.json

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   }
 }

package.json

@@ -28,7 +28,8 @@
   "devDependencies": {
     "eslint": "^6.8.0",
     "eslint-config-airbnb-base": "^14.1.0",
-    "eslint-plugin-import": "^2.20.2"
+    "eslint-plugin-import": "^2.20.2",
+    "mocha": "^8.2.1"
   },
   "dependencies": {
     "node-fetch": "*"