Hi Guillermo,There is no debug mode on test classes (see screenshot), it is at method level and unfortunately the error does not occur when I run the single test method, but when I ran the whole test class. How can I run the debugger at test class level? Cheers Davide On Monday, January 8, 2024 at 10:07:37 AM GMT+1, Guillermo Polito <guillermopolito@gmail.com> wrote: Hi Davide, I donât think something specific to your needs exists, but you can easily build your own.There is already for example `haltIfTest` that will halt if youâre in the dynamic extent of a test. If youâre dealing with concurrency issues, I donât understand how the `haltIfError` is actually helping you.Just running the test in debug mode is not enough? => it should open a debugger when it finds an error, right? G El 8 ene. 2024, a las 09:54, Davide Varvello via Pharo-users <pharo-users@lists.pharo.org> escribió: No ideas? CheersDavide On Thursday, January 4, 2024 at 03:42:17 PM GMT+1, Davide Varvello via Pharo-users <pharo-users@lists.pharo.org> wrote: Hi Noury, You are right and reading your answer I understand I wasn't crystal clear. I have a test scenario where sometimes a race condition occurs, so I'm not expecting any error. Which is why I'd prefer something built-in Pharo: a sort of "haltIfError" or "haltOnError" built-in command.Is there anything like that in Pharo? TIA Davide On Thursday, January 4, 2024 at 01:24:59 PM GMT+1, Noury Bouraqadi <bouraqadi@gmail.com> wrote: Hi Davide, Why not use one of the following: self should: ["message that might signal an error"] raise: Error "Replace Error with the exception you want to catch"self shouldnt: ["message that might signal an error"] raise: Error "Replace Error with the exception you want to catch" On Jan 3 2024, at 4:55 pm, Davide Varvello via Pharo-users <pharo-users@lists.pharo.org> wrote: Hi Guys, Sometimes I'd like to stop my test suite when an error occurs. My raw approach is to put a self halt in the TestResult>>addError: and look at the debugger, but I'm wondering if there is a more suitable way. Can you help me, please? TIADavide