Rails/ActionControllerTestCase doesn't work for non-empty classes

[vlad-pisanov]

Consider

class C1 < ActionController::TestCase
end

class C2 < ActionController::TestCase
  def test_foo
  end
end

Rails/ActionControllerTestCase flags C1 as an offense, but not C2.

Expected

Both C1 and C2 should be flagged since they inherit from the obsolete ActionController::TestCase

RuboCop version

1.34.1 (using Parser 3.1.2.1, rubocop-ast 1.21.0, running on ruby 2.6.9 x86_64-darwin21)
  - rubocop-minitest 0.21.0
  - rubocop-performance 1.14.3
  - rubocop-rails 2.15.2