"function ExCoveralls.start/2 is undefined" about excoveralls HOT 3 CLOSED

I ultimately found out: the reason is that we were not following (or maybe stopped following at some point for some other reasons) the advice in the middle of the documentation:

Note on umbrella application: If you want to use Excoveralls within an umbrella project, every apps must have test_coverage: [tool: ExCoveralls] in the mix.exs of each app.

It seems to have fixed it! I'll close the issue for now.

from excoveralls.

All of your project config looks correct at first glance.

The only idea I have is to try reproducing this with a new minimum viable umbrella app using the same versions of Elixir/Erlang as in your transport-site project.

elixir 1.15.5-otp-24
erlang 24.3.4.13

from excoveralls.

The only idea I have is to try reproducing this with a new minimum viable umbrella app using the same versions
of Elixir/Erlang as in your transport-site project.

Yeah I will try to trim down the app and see how it goes. Maybe I'll have to poke into the Mix source to see if I can set some breakpoint and figure things out too. Thanks!

from excoveralls.