Add functionality back to mocha test explorer

.mocharc.yml

@@ -0,0 +1,5 @@
+require:
+  - source-map-support/register
+reporter: spec
+color: true
+check-leaks: true

.vscode/settings.json

@@ -5,5 +5,9 @@
   "mochaExplorer.files": [
     "out/**/*.test.js",
     "addons/**/out/*.test.js"
+  ],
+  "mochaExplorer.watch": [
+    "out/**/*.js",
+    "addons/**/out/*.js"
   ]
 }