Browser recommendations for Automated Test Framework

  • Release version: Australia
  • Updated March 12, 2026
  • 2 minutes to read
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    Summary of Browser Recommendations for Automated Test Framework

    This document provides essential guidelines for configuring client test runner browsers to run automated tests effectively and maintain optimal performance. Following these recommendations will help avoid performance degradations and ensure successful test execution.

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    Key Features

    • Periodic Browser Restarts: Due to memory-management limitations, browsers like Internet Explorer, Edge, and older versions of Firefox may need to be restarted periodically. The frequency of restarts depends on memory allocation within the browser.
    • CPU Throttling: To prevent CPU throttling when running tests, ensure each client test runner operates in its own browser window and is partially visible on the screen. Avoid locking or shutting off the system screen.
    • Browser Zoom Level: For accurate screen captures during tests, set the browser zoom level to 100%.
    • Rollback in Browser Sessions: Changes made during a test run are rolled back upon completion. Do not modify records in the same browser session while a test is running, as this can interfere with test results.
    • Parallel Testing: Run each client test runner in an incognito or private window to ensure separate browser sessions and prevent unintended rollbacks of legitimate changes made in other tabs.

    Key Outcomes

    By adhering to these browser recommendations, ServiceNow customers can expect smoother automated test runs, minimized performance issues, and consistent test results without interference from session changes. Additionally, closing client test runner windows after testing will protect any legitimate changes from being rolled back. Following these guidelines will enhance the overall efficiency and reliability of the Automated Test Framework.

    Configure client test runner browsers to run automated tests and avoid performance degradations.

    Periodic browser restarts

    These browsers have memory-management limitations that make it necessary to occasionally close and restart the browser when running the client test runner.
    • Internet Explorer
    • Edge
    • Older versions of Firefox

    How often you should close the browser depends on the memory allocation in the browser application.

    Browser CPU throttling

    Some browsers throttle CPU usage for windows that are out of focus. Follow these guidelines to avoid CPU throttling issues.
    • Run each client test runner in its own browser window.
    • Ensure that the client test runner browser window is always partially visible on the screen.
    • Ensure that the system screen is not locked or shut off.

    Browser zoom level

    Client test runners take screen shots as they run tests. For best results with screen shots, leave the browser zoom level set to 100%.

    OS X CPU throttling

    On OS X with the client test runner on Chrome or Safari: If the screen is locked or the client test runner tab is not shown, when the system attempts to run the test suite, tests run significantly slower and may time out. For best performance, run client test runners for scheduled suites in a virtual machine (VM) environment in which the screen does not become locked or disabled.

    Rollback in browser sessions

    The session cookies roll back all the changes made during a test. When a test is running, everything performed in that session is recorded for rollback. Don't modify your instance when a test is running in the same browser session. For example, if you modify records while a test is running in the same session, the changes are rolled back after the test completes. If you navigate around in other tabs in the same session, your work may be rolled back and interfere with tests that rely on implicit navigation.

    Parallel testing

    Follow these guidelines to avoid issues when running multiple tests in parallel.

    Run each client test runner in an incognito or private window
    Because parallel tests roll back all changes tied to the same browser session, it's possible for legitimate changes made in another browser tab to be rolled back during parallel testing. To prevent unwanted rollback of changes, always run client test runners in their own browser session. Opening client test runners in an incognito or private window ensures that they always have their own browser session.
    Close client test runner windows when testing is complete
    To prevent unwanted rollback of changes, always close client test runners after testing is complete. Closing the browser window ensures that test rollback doesn't revert any legitimate changes made in another browser tab.