...because I'm a slave to the coverage report

test/channels/application_cable/channel_test.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+require 'test_helper'
+
+module ApplicationCable
+  class ChannelTest < ActiveSupport::TestCase
+    test 'should exists' do
+      assert Channel
+    end
+  end
+end

test/channels/application_cable/connection_test.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+require 'test_helper'
+
+module ApplicationCable
+  class ConnectionTest < ActiveSupport::TestCase
+    test 'should exists' do
+      assert Connection
+    end
+  end
+end

test/jobs/application_job_test.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+require 'test_helper'
+
+class ApplicationJobTest < ActiveSupport::TestCase
+  test 'should exists' do
+    assert ApplicationJob.new
+  end
+end