How to write unit test using moch-knex package?

How to write unit test using moch-knex package? I used to write with sequelize-mock but now all seems different?

//this is my configuration file for moching my db
'use strict';
import {
  Model
} from 'objection';
import Knex from 'knex';
module.exports = function(config) {
  if (config.enableMockDb) {
    var mockDb = require('mock-knex');
    var db = knex({
      client: 'sqlite'
    });
    mockDb.mock(db);
  } else {
    const knexConfig = {
      client: 'oracledb',
      connection: {
        host: config.host,
        user: config.username,
        password: config.password,
        database: config.database
      },
      debug: true
    }
    // Initialize knex.
    const knex = Knex(knexConfig);
    // Bind all Models to a knex instance. If you only have one database in
    // your server this is all you have to do. For multi database systems, see
    // the Model.bindKnex method.
    Model.knex(knex);
    return knex;
  }
};