Skip plugin test, if redmine_sudo is installed

Gemfile

@@ -10,9 +10,9 @@ gemspec
 #   (this is used to not create conflicts with other plugins)
 if File.file? File.expand_path './.enable_dev', __dir__
   group :development, :test do
-    gem 'awesome_print', require: 'ap'
-    gem 'better_errors'
-    gem 'binding_of_caller'
+    # gem 'awesome_print', require: 'ap'
+    # gem 'better_errors'
+    # gem 'binding_of_caller'
     gem 'debug'
     gem 'marginalia'
     gem 'memory_profiler'

lib/additionals/patches/time_entry_patch.rb

@@ -22,6 +22,8 @@ module Additionals
       end
 
       module InstanceMethods
+        private
+
         def validate_issue_allowed
           return unless issue_id && issue
           # NOTE: do not use user time zone here, because issue do not use it

test/unit/additionals_plugin_test.rb

@@ -4,6 +4,8 @@ require File.expand_path '../../test_helper', __FILE__
 
 class AdditionalsPluginTest < Additionals::TestCase
   def test_known_plugin
+    skip 'Skip test, because redmine_sudo should not be installed for this test.' if Redmine::Plugin.installed? :redmine_sudo
+
     assert_not AdditionalsPlugin.active_sudo?
   end