Latest version of mimic breaks test coverage generation

[nulian]

When I update mimic to the latest version in a project I work on it breaks test coverage.

12:43:43.169 [error] Task #PID<0.13868.0> started from Mimic.Server terminating
** (MatchError) no match of right hand side value: {:error, {:not_cover_compiled, Synapse.AppRequest.Application.Mimic.Original.Module}}
    (mimic 1.7.4) lib/mimic/cover.ex:52: Mimic.Cover.export_coverdata!/1
    (mimic 1.7.4) lib/mimic/cover.ex:32: Mimic.Cover.clear_module_and_import_coverdata!/3
    (elixir 1.14.2) lib/task/supervised.ex:89: Task.Supervised.invoke_mfa/2
    (elixir 1.14.2) lib/task/supervised.ex:34: Task.Supervised.reply/4
    (stdlib 4.2) proc_lib.erl:240: :proc_lib.init_p_do_apply/3
Function: #Function<9.132716098/0 in Mimic.Server.handle_call/3>

[dylan-chong]

Yikes this would have been me. Can you provide some replication steps?

[nulian]

It's in a pretty big project so don't have a good simple example case not sure how it get's triggered.
Think it might be because the project still uses for some older mocks from the old elixir mock library and maybe that conflicts.

[edgurgel]

Think it might be because the project still uses for some older mocks from the old elixir mock library and maybe that conflicts.

That's very much possible! We didn't architect Mimic to work with other libraries that also touch on the cover data 🤔

[ricksonoliveira]

Any updates on this? getting this same on a project

[ricksonoliveira]

@edgurgel @dylan-chong

[edgurgel]

Hi team if we have a simple way to replicate the issue we can investigate

[ricksonoliveira]

To replicate this you just need to have another mock lib along with Mimic, in my case I have the mock lib and the coveralls lib, and have at least one test using the Mock and other using Mimic, then try to run mix coveralls