E2E Tests Overview

E2E testing

While unit tests are crucial for verifying the functionality of individual components in isolation, E2E tests focus on testing the entire application and offer additional benefits. This lesson provides an overview of E2E testing in NestJS, covering key concepts, tools, and practices.

What is E2E testing?

E2E testing involves testing an application in a way that closely resembles how a real user would interact with it. Unlike unit tests focusing on isolated code units, E2E tests validate the entire application stack, including the front-end and back-end integration, in order to verify that the app works as intended.

Here are some benefits of E2E tests:

• Verify integration of components: E2E tests validate the integration of different components and ensure that the entire system works together. We can use it to uncover issues that might only occur when different components interact in a specific sequence.

• Validate configurations: E2E tests can be run in an environment resembling production. This helps identify issues related to configurations and environment-specific behaviors.

• Confidence in releases: Because E2E tests cover the entire application, successful tests provide us with higher confidence in the stability and ...