How do you choose between e2e, unit, and integration testing for your AngularJS app?

2 What is unit testing?

Unit testing, on the other hand, is a method of testing your app from the developer's perspective. It focuses on testing the individual components or units of your app, such as controllers, services, directives, filters, and so on. Unit testing is useful for verifying the logic and behavior of your app, as well as ensuring the quality and maintainability of your code. Unit testing is usually done with a testing framework like Jasmine or Mocha, and a tool like Karma or Protractor.

4 How to choose between e2e, unit, and integration testing?

Choosing between e2e, unit, and integration testing for an AngularJS app is not a straightforward decision, as it depends on various factors such as the scope, complexity, requirements, and budget of the project. Generally speaking, e2e testing should be used when testing the app as a whole to ensure it meets user expectations and needs; this is especially important for critical features or functionalities that affect the core value proposition of the app. However, e2e testing can be time-consuming, expensive, and fragile, so it should be limited to essential scenarios. Unit testing is better suited for testing components or units at a granular level; this is especially important for complex or logic-heavy components or units that are prone to errors or bugs. Integration testing is best for testing interactions and dependencies between components or units; this is important for ensuring the functionality and performance of the app. However, integration testing can be challenging, ambiguous, and overlapping, so it should be balanced with e2e and unit tests and mock data or services should be used when necessary.

5 How to implement e2e, unit, and integration testing for your AngularJS app?

Implementing e2e, unit, and integration testing for an AngularJS app requires some tools and frameworks that are designed for or compatible with it. Popular and recommended options include Protractor, Karma, Jasmine, Mocha, Chai, and Expect. Protractor is an end-to-end testing framework that runs tests against an app in a real browser using the WebDriver protocol; it provides features and syntax specific to AngularJS. Karma is a test runner for JavaScript that allows running tests in multiple browsers and devices; it provides features and plugins useful for AngularJS. Jasmine is a BDD framework that allows writing readable tests using a describe-it syntax; it provides features and matchers useful for AngularJS. Mocha is a feature-rich testing framework that allows writing flexible tests using a describe-it syntax; it provides features and hooks useful for AngularJS. Chai is an assertion library that allows writing fluent assertions using a expect, should, or assert syntax; it provides features and plugins useful for AngularJS. And Expect is an assertion library that allows writing concise assertions using a expect syntax; it provides features and matchers useful for AngularJS.

6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?