Where does the sort order for the Test Execution Assignments come from when they are being run.
Selected Test Execution Assignments when run from the "Tests Assigned to me" has its sort order defined in the UI Macro called "test_step_list".
In the UI Macro, there is an orderBy() method that specifies that the selected records are ordered by the related Test Number.
The code is found on line 49 and is:
1. Navigate to System UI > UI Macros
2. In the "Name" column search for "test_step_list" and go to the record
3. Go to line 49 (Assuming it is OOB New York)