Coveralls is not working

[ybiquitous]

I noticed that the coveralls gem is not working on CI. See below:

https://github.com/octokit/octokit.rb/runs/583312202?check_suite_focus=true#step:6:26

Coveralls encountered an exception:
NoMethodError
undefined method `coverage' for #<SimpleCov::SourceFile:0x0000559805623520>
Did you mean?  coverage_data
/opt/hostedtoolcache/Ruby/2.6.6/x64/lib/ruby/gems/2.6.0/gems/coveralls-0.7.2/lib/coveralls/simplecov.rb:50:in `block in format'
/opt/hostedtoolcache/Ruby/2.6.6/x64/lib/ruby/2.6.0/forwardable.rb:230:in `each'
/opt/hostedtoolcache/Ruby/2.6.6/x64/lib/ruby/2.6.0/forwardable.rb:230:in `each'
/opt/hostedtoolcache/Ruby/2.6.6/x64/lib/ruby/gems/2.6.0/gems/coveralls-0.7.2/lib/coveralls/simplecov.rb:40:in `format'
/opt/hostedtoolcache/Ruby/2.6.6/x64/lib/ruby/gems/2.6.0/gems/simplecov-0.18.5/lib/simplecov/formatter/multi_formatter.rb:10:in `block in format'
/opt/hostedtoolcache/Ruby/2.6.6/x64/lib/ruby/gems/2.6.0/gems/simplecov-0.18.5/lib/simplecov/formatter/multi_formatter.rb:8:in `map'
/opt/hostedtoolcache/Ruby/2.6.6/x64/lib/ruby/gems/2.6.0/gems/simplecov-0.18.5/lib/simplecov/formatter/multi_formatter.rb:8:in `format'

The cause of the error seems that the coveralls gem does support the latest simplecov gem.
The simplecov gem had the API change with the v0.18.0.
See also simplecov-ruby/simplecov@6e7a9ab.

In addition, according to lemurheavy/coveralls-ruby#130, the coveralls gem seems unmaintained.

[indigok]

Thanks for opening this up and adding all the context! We'll look at removing the coveralls dependency as it's not one we use much 🙇‍♀️

[janosrusiczki]

I logged an issue and a solution on the coveralls repo too.

lemurheavy/coveralls-ruby#161

The solution is to switch away from the official coveralls gem.