Add tests of $base_url in UiHelperTrait

virag.jain → made their first commit to this issue’s fork.

I'd like to contribute by adding explicit test coverage for UiHelperTrait’s handling of $base_url. Before proceeding, I’d appreciate some clarification to ensure alignment with expectations.

Should the tests be placed in a new class (e.g., UiHelperTraitBaseUrlTest extending BrowserTestBase) or added to UiHelperTrait existing one? Also, should the focus be on all relevant methods (buildUrl(), getAbsoluteUrl(), drupalGet(), and base path stripping logic), or just a subset?

Lastly, since this issue was originally raised in #2986962 around drupalGet() not handling base URLs correctly, should tests specifically verify that scenario, or more broadly validate the trait's overall handling?

Happy to begin implementation with your guidance. Thanks!