chore: disable no-unused-expressions for test files

Chai expect() triggers no-unused-expressions in Standard. Override for
test/**/*.js so test files don't need eslint-disable on every expect().

Author: AniketDev7

.eslintrc.js

@@ -20,5 +20,13 @@ module.exports = {
     'promise'
   ],
   rules: {
-  }
+  },
+  overrides: [
+    {
+      files: ['test/**/*.js'],
+      rules: {
+        'no-unused-expressions': 'off'
+      }
+    }
+  ]
 }