Test Mendix Apps Using Selenium IDE

Last update: Edit

1 Introduction

Selenium IDE is a Firefox plugin that records and plays back user interactions with the browser.

After using this how-to, you will know how to do the following:

  • Record a simple test scripts with Selenium IDE
  • Find unique CSS selectors

2 Prerequisites

This how-to will teach you how to do the following:

  • Download and install Firefox
  • Download and install Selenium IDE (when Selenium IDE is installed, it is then available as a Firefox plugin)

These are the software versions used in this how-to:

Software Version Used in This How-To
Firefox 67.0.1
Selenium IDE 3.8.1

3 Installing & Running the Company Expenses App

Follow these steps to install and run the Company Expenses app:

  1. Open Mendix Studio Pro.
  2. Click the Marketplace icon in the top toolbar:

  3. Search for Company Expenses, then select Company Expenses:

  4. Click Download and then OK. This will open the Company Expenses app in Studio Pro.

  5. Click the play button (Run Locally), then View App.

4 Create Your First Automated Test

To create an automated test by using the record button in Selenium IDE, follow these steps:

  1. Open Firefox and click the Selenium IDE icon in the browser toolbar:

  2. Select Record a new test in a new project:

  3. Enter a name for your new Selenium project (for example, CompanyExpenses).

  4. Enter the URL for your Company Expenses app’s login screen (http://localhost:8080/login.html), then click START RECORDING. This will open up your app in a new browser window. The Selenium IDE is now recording.

  5. Sign in with default administrator credentials:

    • User name: MxAdmin
    • Password: 1
  6. After you logged in, click Sign out on the right side of the app:

  7. In the Selenium IDE, click the record icon to stop recording:

  8. Enter a name for your new test, (for example, Test1). The Selenium IDE should now look like this:

  9. Now that you have a test, click the Run current test icon:

    Every passed test step will be marked green:

5 Locating & Changing a Test Target

It is possible that you will need to edit your Selenium IDE test script before you can run it regularly. This may happen because, for example, HTML tag IDs are generated dynamically and will be different with each run of the same page.

When necessary, you will need to find the right locators in order to tell Selenium IDE the GUI targets (for example, buttons, text boxes, and data grids) on which it needs to operate. To make it easier to create a locator for Mendix elements, mx-name is added to the class of an element. If you change the position of an element in a document, there is thus no need to rewrite the script.

In this example scenario, a running test has failed on the target id=mxui_widget_Wrapper_23:

The element with this target does not exist on the page for Selenium IDE, because the number in the ID is not always the same. You need to find another target selector for the same element that Selenium IDE will pick up. Mendix uses CSS classes to identify page content like widgets and pop-up windows, so you can use these classes in Selenium IDE to manipulate pages and verify data.

A widget can be given a name in Mendix Studio Pro, and this name will appear in the HTML document as a class name prefixed by mx-name-. For instance, a grid named EmployeeGrid will get the CSS class mx-name-EmployeeGrid. This is true for all Mendix widgets.

In this example scenario, you need to do the following:

  1. Open the page in Studio Pro that corresponds to where the Selenium IDE test failed.
  2. Highlight the element where the Selenium IDE test failed.
  3. The Name property for the User name field is textBox10. Every Mendix element automatically gets the CSS class mx-name-[Name], so note that this field will have the CSS class mx-name-textBox10.

  4. Open the developer tools for your browser (with the app still open to where the Selenium IDE test failed) and search for mx-name-textBox10. There is a matching node, so you have now verified a unique selector for the User name field.

  5. In Selenium IDE, change the Target id=mxui_widget_Wrapper_23 into css=.mx-name-textBox6:

  6. Click the Run current test icon to see if your test passes.

6 Read More

Learn more about this topic using the following helpful link: