Lint Mocha tests too (#3824)

platform/npm/.eslintrc.json

@@ -1,4 +1,5 @@
 {
+    "root": true,
     "env": {
         "es2021": true,
         "node": true

platform/npm/package.json

@@ -6,7 +6,7 @@
   "main": "index.js",
   "scripts": {
     "build": "node build.js",
-    "lint": "eslint js/ *.js",
+    "lint": "eslint js/ *.js tests/",
     "test": "node test.js --mocha"
   },
   "repository": {

platform/npm/tests/.eslintrc.json

@@ -0,0 +1,5 @@
+{
+    "env": {
+        "mocha": true
+    }
+}