Raise error if required filed was not loaded

lib/sidekiq/cli.rb

@@ -244,7 +244,10 @@ module Sidekiq
         end
         options[:tag] ||= default_tag
       else
-        require options[:require] or raise ArgumentError, "#{options[:require]} was not required"
+        not_required_message = "#{options[:require]} was not required, you should use an explicit path: " +
+            "./#{options[:require]} or /path/to/#{options[:require]}"
+
+        require(options[:require]) || raise(ArgumentError, not_required_message)
       end
     end
 

sidekiq.rb

@@ -1 +0,0 @@
-# Is used for testing purposes

test/test_cli.rb

@@ -31,14 +31,6 @@ class TestCli < Sidekiq::Test
       assert @cli.valid?
     end
 
-    it 'does not require existing file' do
-      @cli.parse(['sidekiq', '-r', 'sidekiq.rb'])
-
-      assert_raises ArgumentError do
-        @cli.run
-      end
-    end
-
     it 'does not boot rails' do
       refute defined?(::Rails::Application)
       @cli.parse(['sidekiq', '-r', './myapp'])