Hello all I have done some experiments, and basically all the questions in my previous mail can be ignored. I think it is all a question of timing, which I sort of understand. Perhaps someone can clarify for me. All my previous tests involved running the whole test suite, to ensure the set-up and tear-down methods were run. As an experiment, I selected the one red method and clicked 'Run Tests'. After about 10 seconds, a halt appeared with the message 'Test took too long'. When I clicked 'Proceed', the green appeared almost immediately. I tried again several times with similar results, although the halt occurred at different places in the code. I went back to my old P6 version and tried running tests on the one method; each time, it ran to green in about 11-12 seconds. So back now to the P7 version; wondered if there is now a setting for permitted test duration. Eventually found it under 'System', default 10 secs. Changed to 15 secs, re-run red test, now comes up green. Re-run whole test suite, all green. So it all comes down to my ignorance of test settings. But Pharo is less than helpful; if you run the whole test suite, there is no way to distinguish a test which failed due to a wrong assertion from one which was terminated for taking too long - or did I miss something? Peter Kenny