Adding tests for mocha and jest

.vscode/tasks.json

@@ -0,0 +1,15 @@
+{
+  // See https://go.microsoft.com/fwlink/?LinkId=733558
+  // for the documentation about the tasks.json format
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "type": "npm",
+      "script": "jest",
+      "group": {
+        "kind": "test",
+        "isDefault": true
+      }
+    }
+  ]
+}