Troubleshooting Jest and Create-react-app: Fixing “Cannot use import statement outside a module” Error

Introduction: Are you facing the frustrating “Cannot use import statement outside a module” error while running Jest in your React Native application? Don’t worry, you’re not alone. In this article, we’ll dive into the root cause of this issue and explore potential solutions to get your tests up and running smoothly. Understanding the Error What…

How to Mock useHistory Hook in Jest: A Complete Guide for React Router v5.1.2 with TypeScript

Introduction: Welcome to our comprehensive guide on mocking the useHistory hook in Jest for React Router v5.1.2 with TypeScript. If you’ve encountered the error “TypeError: Cannot read property ‘history’ of undefined” while running unit tests, you’re in the right place. In this article, we’ll walk you through the process of mocking the useHistory hook to…

How to Solve the “ReactWrapper::state() can only be called on class components” Issue in Unit Testing with Jest and Enzyme

If you’re encountering the error message “ReactWrapper::state() can only be called on class components” while writing unit tests in React using Jest and Enzyme, don’t worry. You’re not alone in facing this problem. In this article, we’ll explore the cause of this error and provide you with a solution to overcome it. Understanding the Error…

Efficiently Mock TypeORM Connections in Your Jest Unit Tests: A Comprehensive Guide to Improving Test Performance and Reliability

In this blog post, we will discuss a common issue faced by developers when trying to mock TypeORM connections using Jest: issue #5751. We’ll explore different methods to efficiently mock connections, improve test performance, and ensure that your tests are reliable, all while ranking high in search engines with unique and easy-to-rank keywords. Let’s dive…