The URL of the test page is relative to the deployed business application used under the subpath /test/integration/opaTests.qunit.html and can be opened with a browser.
To create a new test case, click on the plus icon.
Select the type in the opened pop-up and enter a test case name.
Click on Save.
Select the new Journey or Page Object on the left and add the testing code.
Deploy the Journeys or Page Objects and click on Show test page.