How to call on_start before each testcase, like setup in unittest?

[ityoung]

Feature request

Setup method like unittest

Expected behavior

Method on_start only run once, but my testcase require different parameter recieved from an HTTP response.

If I get this variable with on_start, then only first test can pass; and if I call the get_parameter method in testcase, it will makes testresult inaccurate for the time waiting for response.

Actual behavior

Is there any method like setup with unittest(I didn't find in document), or any suggests that can solve this scene?

[cgoldberg]

similar feature is already implemented and the code has landed in master.
see:
https://docs.locust.io/en/latest/writing-a-locustfile.html#setups-teardowns-on-start-and-on-stop

[ityoung]

@cgoldberg many thanks, and sorry for I didn't see that.

[ityoung]

@cgoldberg hi, I find out that the on_start method will not run after times executing testset great than Number of users to simulate I input on webpage, is that a bug? I want to run on_start every time, and I have to set the locust_count a very large number...

[cgoldberg]

@ityoung, I'm sorry, but I don't understand your issue description or what you are asking. Can you clarify?

[ityoung]

@cgoldberg sorry for my poor english..

What I want:

For a taskset class, method on_start can run each time before tasks be executed, not matter how many user I simulate(input on webUI).

What I get:

When I type 10 in Number of users to simulate text field, the on_start will run 10 times, but the test is going on, and on_start will not be called ever since, and that make my tasks uninitialized.

Question:

Is locust set on_start running times as number of users to simulate on purpose?

[maingoh]

I am also looking for a on_start/setup and on_stop/teardown hook at the taskset level, not the user level.

I would like to create/cleanup a resource before/after each taskset, and I don't want this resource to be reused. If I use on_start or test_start hook, it will only fire when the user is created, not when the taskset is launched.

Or I would need a way for locust to recreate a user each time to simulate independant users when using with LoadTestShape.

[dagosi]

I'm not sure why this issue is closed, but I'm looking for the same thing. I need to create a resource in the server's DB before making a request, and this needs to happen before each request (or task). I haven't found a hook that works this way. Any suggestions?

[cyberw]

There’s no built in way to do that, but you can override the run task method, as done here for example https://github.com/SvenskaSpel/locust-plugins/blob/bf4097eb3a04580de886b5b138151a6b0d21660e/locust_plugins/__init__.py#L209