Test database setup and teardown in Express - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Express module.

Express

const express = require([1]);

Drag options to blanks, or click blank then click option'

A"express"

B"http"

C"path"

D"fs"

Attempts:

3 left

💡 Hint

Common Mistakes

Using other module names like 'http' or 'fs' instead of 'express'.

Forgetting the quotes around the module name.

To use Express, you must require the 'express' package by its exact name.

2fill in blank

medium

Complete the code to create a new Express application instance.

Express

const app = [1]();

Drag options to blanks, or click blank then click option'

Arouter

Bhttp

Cexpress

Dserver

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'http' or 'server' instead of 'express'.

Forgetting the parentheses after the function name.

Calling the imported 'express' function creates a new app instance.

3fill in blank

hard

Fix the error in the test setup function to connect to the test database.

Express

beforeAll(async () => {
  await [1].connect('mongodb://localhost/testdb');
});

Drag options to blanks, or click blank then click option'

Ahttp

Bmongoose

Cexpress

Dapp

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to connect using 'app' or 'express' which are for the server.

Using 'http' which is unrelated to database connections.

Use the 'mongoose' library to connect to MongoDB in tests.

4fill in blank

hard

Fill both blanks to properly close the database connection after tests.

Express

afterAll(async () => {
  await [1].[2]();
});

Drag options to blanks, or click blank then click option'

Amongoose

Bapp

Cdisconnect

Dclose

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'app.close()' which closes the server, not the database.

Using 'mongoose.close()' which is not a valid method.

Use 'mongoose.disconnect()' to close the database connection after tests.

5fill in blank

hard

Fill all three blanks to set up and tear down a test database connection correctly.

Express

beforeAll(async () => {
  await [1].connect('mongodb://localhost/testdb');
});

afterAll(async () => {
  await [2].[3]();
});

Drag options to blanks, or click blank then click option'

Amongoose

Bapp

Cdisconnect

Dclose

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'app' instead of 'mongoose' for database operations.

Using 'close' instead of 'disconnect' to close the database.

Use 'mongoose.connect()' to connect and 'mongoose.disconnect()' to close the database connection in tests.