Currently on the builds page when viewing the tests in a particular build, there are no sorting options. There are several columns on the page, but in order to find a specific test one must scroll down the list of tests until the appropriate one has loaded. This requires careful attention to the full name of each test.
If these were sortable alphabetically then a user could scroll quickly until reaching the appropriate starting letter of the test. Also being able to sort by browser, operating system, or test execution time would be useful for the same reasons.