You can use the Diff tool in Visual mode to create regression controls for application windows. You can do this for an entire test scenario or just an individual test. Note that the method described below uses screenshots from a test run as controls, but you can use files on your drive if you prefer. See the Diff tool documentation for more information.

Add a Browser Playback test early in your scenario and set the Action to Resize Viewport to define a fixed size of the browser viewports that are going to be compared in your regression test. This helps to prevent false positives that might come up due to different browsers, operating systems, display resolutions, and so on used in testing. It is recommended that you set your display scale to 100% when using this option. Anything else may affect the results.

For a Test Scenario

  1. Right-click the test scenario you want to create a regression test for and choose Create/Update Regression Control.
  2. Choose Create Regression Control and click Finish.

The test scenario will run, creating a Diff tool that is set to Visual mode and populated with a control screenshot for each of the tests in the scenario. When you run the scenario again, any visual differences between the current windows and the control screenshots will be reported in the Quality Tasks panel.

For Individual Tests

  1. Right-click the test you want to create a regression test for and choose Add Output.
  2. Choose Screenshot and click Next.
  3. Choose the Diff tool from the list of tools and click Finish. The Diff tool opens in the workspace.
  4. Choose Visual from the Diff mode menu.
  5. Save your changes.
  6. Right-click the test and choose Create/Update Regression Control.
  7. Choose Update Regression Controls and click Finish. 
    • Note: If this test is not the first test in your scenario, you might need to manually run the preceding tests to get to the screen this one needs to be on before you can update the regression control.

The test will run and save a control screenshot to the Diff tool. When you run the test again, any visual differences between the current window and the control screenshot will be reported in the Quality Tasks panel. These differences will be identified by their position and size; double-click to view side-by-side screenshots with the identified area highlighted. Note that if more than one difference was detected on the same screen, all of them will be shown with the one you double-clicked highlighted in red and the others in white. Right-click the reported difference and choose Ignore Visual Difference to add the area to the Ignored Differences table of the Diff tool.


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