talk/tests/utils/mongoose.js

const mongoose = require('../../mongoose');

// Ensure the NODE_ENV is set to 'test',
// this is helpful when you would like to change behavior when testing.
process.env.NODE_ENV = 'test';
function clearDB(done) {
  for (let i in mongoose.connection.collections) {
    mongoose.connection.collections[i].remove(function() {});
  }
  return done();
}

beforeEach(function (done) {
  if (mongoose.connection.readyState === 0) {
    mongoose.on('open', function() {
      if (err) {
        throw err;
      }

      return clearDB(done);
    });
  } else {
    return clearDB(done);
  }
});

after(function (done) {
  clearDB(()=>{});
  mongoose.disconnect();
  return done();
});