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Troubleshooting Inconsistent Selector Behavior at Runtime

Overview

An issue can occur where a test fails intermittently because the automation platform uses a different selector at runtime than the one explicitly defined in the test step. This leads to inconsistent behavior where the test sometimes passes and sometimes fails by interacting with the wrong element.

How It Works

The platform maintains a hierarchy of confirmed selectors for each test action. During execution, the runtime engine evaluates this list and uses the first valid selector it finds. This issue arises when multiple selectors are confirmed for a single action, such as a stable XPath selector and another selector based on a dynamic ID.

For example, you may have defined a stable selector like (//select[@aria-label='Body Style'])[last()], but another confirmed selector based on a dynamic ID like //select[@id='Id_GiveBodyStyle_57886'] also exists for that same action. The runtime might choose the dynamic ID selector, which can change between sessions and cause the step to fail.

To resolve this, you must ensure that only the single, most reliable selector is confirmed for the action. Review all confirmed selectors for the failing step and remove any that are unintended, unstable, or less specific than your desired selector.

  1. Identify the failing test step.
  2. Open the step's selector settings to view all confirmed selectors.
  3. Identify the most stable and correct selector you want the test to use.
  4. Remove or un-confirm all other selectors for that action, especially those relying on dynamic attributes.
  5. Save the changes and re-run the test to confirm that the runtime consistently uses the correct selector.

Limitations

The platform's ability to consistently select the correct element depends on having a clear and unambiguous selector configuration. If multiple conflicting selectors are confirmed for the same action, the runtime's choice may not be predictable. Test stability also depends on the application having stable attributes; if elements only have dynamic identifiers, creating a robust selector will be challenging.

Related Info

  • Prefer Stable Attributes: Whenever possible, use selectors based on stable attributes like name, aria-label, or custom data-test attributes over dynamic ones like auto-generated IDs or classes.
  • Avoid Ambiguity: Ensure only one primary selector is confirmed for an action to prevent the runtime from choosing an unintended one.
  • Collaborate with Development: Work with your development team to add unique and static test identifiers (e.g., data-test-id) to the application to make elements more accessible for automation.