database_tests.js

const mongoose = require("mongoose");
const Schema = mongoose.Schema;
const chai = require("chai");
const expect = chai.expect;
const conf = require("../config/config");
// Create a new schema that accepts a 'name' object.
// 'name' is a required field
const testSchema = new Schema({
  name: { type: String, required: true }
});

//Create a new collection called 'Name'
const Name = mongoose.model("Name", testSchema);

describe("Database Tests", function() {
  //Before starting the test, create a sandboxed database connection
  //Once a connection is established invoke done()

  before(function(done) {
    mongoose.connect(conf.testDbURL, {
      useNewUrlParser: true,
      useUnifiedTopology: true
    });
    const db = mongoose.connection;
    db.on("error", console.error.bind(console, "connection error"));
    db.once("open", function() {
      console.log("We are connected to test database!");
      done();
    });
  });
  describe("Test Database", function() {
    //Save object with 'name' value of 'Mike"
    it("New name saved to test database", function(done) {
      var testName = Name({
        name: "Mike"
      });

      testName.save(done);
    });
    it("Don't save incorrect format to database", function(done) {
      //Attempt to save with wrong info. An error should trigger
      var wrongSave = Name({
        notName: "Not Mike"
      });
      wrongSave.save(err => {
        if (err) {
          return done();
        }
        throw new Error("Should generate error!");
      });
    });
    it("Should retrieve data from test database", function(done) {
      //Look up the 'Mike' object previously saved.
      Name.find({ name: "Mike" }, (err, name) => {
        if (err) {
          throw err;
        }
        if (name.length === 0) {
          throw new Error("No data!");
        }
        done();
      });
    });
  });
  // After all tests are finished drop database and close connection
  after(function(done) {
    mongoose.connection.db.dropDatabase(function() {
      mongoose.connection.close(done);
    });
  });
});