Test mocking is a methodology in software testing where certain components, functions, or modules are replaced with fake versions, or "mocks", in order to isolate the code under test. These mock objects can be programmed to mimic the behavior of real components but also to return predictable responses, simulate exceptions, or record interactions, which are then verified by the test. The purpose of test mocking is to create a controlled environment where dependencies are neutralized so that the functionality of the individual unit can be tested independently. It helps in reducing the complexity of tests, controlling side effects, improving test performance, and ensuring that tests are not affected by the unreliability or unavailability of external dependencies. Mocking is a key technique in unit testing and is supported by various testing frameworks and libraries.
Supercharge your Next.js app testing with Playwright – a tool for automating Chromium, Firefox, and WebKit browsers. In this guide, I will walk you through setting up and running your first Playwright E2E test for a Next.js application.
In this article, we will explore how to intercept and mock HTTP traffic in Playwright tests. By doing so, we can create more reliable and efficient tests, while also simulating various scenarios that may be difficult to reproduce otherwise. We will discuss the benefits of using this approach, various ways to intercept and mock HTTP requests, and real-world examples to demonstrate the process. So, let's get started!
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