How to Load and Run an External .js Script from Protractor

A comprehensive guide on executing external JavaScript files in Protractor tests, including both synchronous and asynchronous patterns.
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How to Load and Run an External .js Script from Protractor

Protractor is a powerful end-to-end testing framework for Angular applications, but sometimes you might need to run an external JavaScript file before executing your tests. This could involve setting up prerequisites or configuring settings. If you're facing challenges with this task, you’re not alone, and this guide is here to help you get through it seamlessly.

Understanding the Problem

Common Structure with Protractor

In Protractor, your test scripts are typically structured using describe and it blocks. Here’s a basic outline you might start with:

[[See Video to Reveal this Text or Code Snippet]]

Let’s break down the possible approaches for both synchronous and asynchronous JavaScript files.

Method 1: Running a Synchronous JavaScript File

If your JavaScript code is synchronous, the easiest approach is to convert it into a function that takes parameters, and then export this function. Here's how you can do it:

[[See Video to Reveal this Text or Code Snippet]]

Modify Your Protractor Test: Within your Protractor test, require the external JavaScript file and call the exported function with the necessary arguments.

[[See Video to Reveal this Text or Code Snippet]]

This method works seamlessly for synchronous code where you want to execute your JavaScript functions in a linear manner.

Method 2: Running an Asynchronous JavaScript File

If your external JavaScript file is asynchronous, the handling will vary. In this scenario, you need to ensure that you properly manage the asynchronous nature. Here's a basic approach:

Adjust Your JavaScript File: If your JavaScript file contains asynchronous code, make sure to return a Promise or use async/await.

Handle It in Your Protractor Test: You will need to work with asynchronous testing patterns in Protractor. Ensure you are using async and await where necessary, or return a Promise in your it block.

[[See Video to Reveal this Text or Code Snippet]]

Wrapping Up

Running an external JavaScript file in Protractor is not only possible but can be pretty straightforward once you understand the difference between synchronous and asynchronous patterns. Always ensure your external code is adaptable to the way Protractor processes its execution flow.

By following the methods outlined above, whether you have synchronous or asynchronous JavaScript code, you'll be set to integrate external scripts into your Protractor tests efficiently.

Feel free to reach out if you have any further questions about using Protractor or any other testing frameworks!