demo.test.js

const assert = require('assert');
//before(function(){
//});

describe("Outer", function() {
    it("TEST", (function() {
        assert.equal('Outer TEST',this.test.fullTitle());
    }));
});

package.json

{
  "name": "mocha-test",
  "version": "1.0.0",
  "description": "",
  "main": "demo.test.js",
  "dependencies": {},
  "devDependencies": {
    "mocha": "^6.0.2"
  },
  "scripts": {
    "test": "mocha --reporter tap demo.test.js --watch & echo 'Now do touch demo.test.js several times!'"
  },
  "author": "",
  "license": "ISC"
}