UI Testing

Custom UI testing is an optional feature that enables you to create and automatically run UI tests for your applications.

Overview

AEM provides an integrated suite of Cloud Manager quality gates to ensure smooth updates to custom applications. In particular, IT test gates already support the creation and automation of custom tests using AEM APIs.

UI tests are Selenium-based tests packaged in a Docker image in order to allow a wide choice in language and frameworks (such as Java and Maven, Node and WebDriver.io, or any other framework and technology built upon Selenium). Additionally, a UI tests project can easily be generated by using the AEM Project Archetype.

UI tests are executed as part of a specific quality gate for each Cloud Manager pipeline with a Custom UI Testing step in production pipelines or optionally non-production pipelines. Any UI tests including regression and new functionalities enables errors to be detected and reported.

Unlike custom functional tests, which are HTTP tests written in Java, UI tests can be a Docker image with tests written in any language, as long as they follow the conventions defined in the section Building UI Tests.

Get Started with UI Tests

This section describes the steps required to set up UI tests for execution in Cloud Manager.

1. Decide on the programming language that you want to use.

   • For JavaScript and WDIO, use the sample code which is automatically generated in the ui.tests folder of your Cloud Manager repository.

     NOTE

     If your repository was created before Cloud Manager automatically created it.tests folders, you may also generate the latest version using the AEM Project Archetype.

   • For Java and WebDriver, use the sample code from the AEM Test Samples repository.

   • For other programming languages, refer to the section Building UI Tests in this document to set up the test project.

2. Ensure that UI testing is activated as per the section Customer Opt-In in this document.

3. Develop your test cases and run them tests locally.

4. Commit your code into the Cloud Manager repository and execute a Cloud Manager pipeline.

Building UI Tests

A Maven project generates a Docker build context. This Docker build context describes how to create a Docker image containing the UI tests, which Cloud Manager uses to generate a Docker image containing the actual UI tests.

This section describes the steps needed to add a UI tests project to your repository.

Generate a Docker Build Context

In order to generate a Docker build context, you need a Maven module that:

• Produces an archive that contains a Dockerfile and every other file necessary to build the Docker image with your tests.
• Tags the archive with the ui-test-docker-context classifier.

The simplest way to do this is to configure the Maven Assembly Plugin to create the Docker build context archive and assign the right classifier to it.

You can build UI tests with different technologies and frameworks, but this section assumes that your project is laid out in a way similar to the following.

├── Dockerfile
├── assembly-ui-test-docker-context.xml
├── pom.xml
├── test-module
│   ├── package.json
│   ├── index.js
│   └── wdio.conf.js
└── wait-for-grid.sh

The pom.xml file takes care of the Maven build. Add an execution to the Maven Assembly Plugin similar to the following.

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-assembly-plugin</artifactId>
    <configuration>
        <descriptors>
            <descriptor>${project.basedir}/assembly-ui-test-docker-context.xml</descriptor>
        </descriptors>
        <tarLongFileMode>gnu</tarLongFileMode>
    </configuration>
    <executions>
        <execution>
            <id>make-assembly</id>
            <phase>package</phase>
            <goals>
                <goal>single</goal>
            </goals>
        </execution>
    </executions>
</plugin>

This execution instructs the Maven Assembly Plugin to create an archive based on the instructions contained in assembly-ui-test-docker-context.xml, called an assembly descriptor in the plugin’s jargon. The assembly descriptor lists all the files that must be part of the archive.

<assembly>
    <id>ui-test-docker-context</id>
    <includeBaseDirectory>false</includeBaseDirectory>
    <formats>
        <format>tar.gz</format>
    </formats>
    <fileSets>
        <fileSet>
            <directory>${basedir}</directory>
            <includes>
                <include>Dockerfile</include>
                <include>wait-for-grid.sh</include>
            </includes>
        </fileSet>
        <fileSet>
            <directory>${basedir}/test-module</directory>
            <excludes>
                <exclude>node/**</exclude>
                <exclude>node_modules/**</exclude>
                <exclude>reports/**</exclude>
            </excludes>
        </fileSet>
    </fileSets>
</assembly>

The assembly descriptor instructs the plugin to create an archive of type .tar.gz and assigns the ui-test-docker-context classifier to it. Moreover, it lists the files that must be included in the archive including the following.

• A Dockerfile, mandatory for building the Docker image
• The wait-for-grid.sh script, whose purposes are described below
• The actual UI tests, implemented by a Node.js project in the test-module folder

The assembly descriptor also excludes some files that might be generated while running the UI tests locally. This guarantees a smaller archive and faster builds.

The archive containing the Docker build context is automatically picked up by Cloud Manager, which will build the Docker image containing your tests during its deployment pipelines. Eventually, Cloud Manager will run the Docker image to execute the UI tests against your application.

The build should produce either zero or one archive. If it produces zero archives, the test step passes by default. If the build produces more than one archive, which archive is selected is non-deterministic.

Customer Opt-In

In order for Cloud Manager to build and execute your UI tests, you must opt into this feature by adding a file to your repository.

• The file name must be testing.properties.
• The file contents must be ui-tests.version=1.
• The file must be under the maven submodule for UI tests next to the pom.xml file of the UI tests submodule.
• The file must be at the root of the built tar.gz file.

The UI tests build and executions will be skipped if this file is not present.

To include a testing.properties file in the build artifact, add an include statement in the assembly-ui-test-docker-context.xml file.

[...]
<includes>
    <include>Dockerfile</include>
    <include>wait-for-grid.sh</include>
    <include>testing.properties</include> <!-- opt-in test module in Cloud Manager -->
</includes>
[...]

If you are using the samples provided by Adobe:

• For the JavaScript-based ui.tests folder generated based from the AEM Project Archetype, you can execute below command to add the required configuration.

  echo "ui-tests.version=1" > testing.properties
  
  if ! grep -q "testing.properties" "assembly-ui-test-docker-context.xml"; then
    awk -v line='                <include>testing.properties</include>' '/<include>wait-for-grid.sh<\/include>/ { printf "%s\n%s\n", $0, line; next }; 1' assembly-ui-test-docker-context.xml > assembly-ui-test-docker-context.xml.new && mv assembly-ui-test-docker-context.xml.new assembly-ui-test-docker-context.xml
  fi
  

• The Java test samples provided already do have the opt-in flag set.

Writing UI Tests

This section describes the conventions that the Docker image containing your UI tests must follow. The Docker image is built out of the Docker build context described in the previous section.

Environment Variables

The following environment variables will be passed to your Docker image at run time.

The Adobe test samples provide helper functions to access the configuration parameters:

• JavaScript: See the lib/config.js module
• Java: See the Config class

Waiting for Selenium to be Ready

Before the tests start, it’s the responsibility of the Docker image to ensure that the Selenium server is up and running. Waiting for the Selenium service is a two-steps process.

1. Read the URL of the Selenium service from the SELENIUM_BASE_URL environment variable.
2. Poll at regular interval to the status endpoint exposed by the Selenium API.

Once the Selenium’s status endpoint answers with a positive response, the tests can start.

The Adobe UI test samples handle this with the script wait-for-grid.sh, which is executed upon Docker startup and starts the actual test execution only once the grid is ready.

Generate Test Reports

The Docker image must generate test reports in the JUnit XML format and save them in the path specified by the environment variable REPORTS_PATH. The JUnit XML format is a widely-used format for reporting the results of tests. If the Docker image uses Java and Maven, standard test modules such as Maven Surefire Plugin and Maven Failsafe Plugin can generate such reports out of the box.

If the Docker image is implemented with other programming languages or test runners, check the documentation for the chosen tools for how to generate JUnit XML reports.

Capture Screenshots and Videos

The Docker image may generate additional test output (e.g. screenshots or videos) and save them in the path specified by the environment variable REPORTS_PATH. Any file found below the REPORTS_PATH are included in the test result archive.

The test samples provided by Adobe by default create screenshots for any failed test.

You can use the helper functions to create screenshots through your tests.

• JavaScript: takeScreenshot command
• Java: Commands

If a test result archive is created during a UI test execution, you can download it from Cloud Manager using the Download Details button under the Custom UI Testing step.

Upload Files

Tests sometimes must upload files to the application being tested. In order to keep the deployment of Selenium flexible relative to your tests, it is not possible to directly upload an asset directly to Selenium. Instead, uploading a file requires the following steps.

1. Upload the file at the URL specified by the UPLOAD_URL environment variable.
   • The upload must be performed in one POST request with a multipart form.
   • The multipart form must have a single file field.
   • This is equivalent to curl -X POST ${UPLOAD_URL} -F "data=@file.txt".
   • Consult the documentation and libraries of the programming language used in the Docker image to know how to perform such an HTTP request.
   • The Adobe test samples provide helper functions for uploading files:
     • JavaScript: See the getFileHandleForUpload command.
     • Java: See the FileHandler class.
2. If the upload is successful, the request returns a 200 OK response of type text/plain.
   • The content of the response is an opaque file handle.
   • You can use this handle in place of a file path in an <input> element to test file uploads in your application.

Running UI Tests Locally

Before activating UI tests in a Cloud Manager pipeline, it’s recommended to run the UI tests locally towards the AEM as a Cloud Service SDK or in an actual AEM as a Cloud Service instance.

Prerequisites

The tests in Cloud Manager will be executed using a technical admin user.

For running the UI tests from your local machine, create a user with admin-like permissions to achieve the same behavior.

JavaScript Test Sample

1. Open a shell and navigate to the ui.tests folder in your repository

2. Execute the below command to start the tests using Maven

   mvn verify -Pui-tests-local-execution \
   -DAEM_AUTHOR_URL=https://author-<program-id>-<environment-id>.adobeaemcloud.com \
   -DAEM_AUTHOR_USERNAME=<user> \
   -DAEM_AUTHOR_PASSWORD=<password> \
   -DAEM_PUBLISH_URL=https://publish-<program-id>-<environment-id>.adobeaemcloud.com \
   -DAEM_PUBLISH_USERNAME=<user> \
   -DAEM_PUBLISH_PASSWORD=<password> \
   -DHEADLESS_BROWSER=true \
   -DSELENIUM_BROWSER=chrome
   

Java Test Sample

1. Open a shell and navigate to the ui.tests/test-module folder in your repository

2. Execute the below command to start the tests using Maven

   # Start selenium docker image (for x64 CPUs)
   docker run --platform linux/amd64 -d -p 4444:4444 selenium/standalone-chrome-debug:latest
   
   # Start selenium docker image (for ARM CPUs)
   docker run -d -p 4444:4444 seleniarm/standalone-chromium
   
   # Run the tests using the previously started Selenium instance
   mvn verify -Pui-tests-local-execution -DSELENIUM_BASE_URL=http://<server>:<port>
   

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