WIP: Add UseRequireRelative cop

config/default.yml

@@ -84,3 +84,6 @@ Discourse/Plugins/NamespaceConstants:
     - '**/spec/**/*'
     - '**/tasks/**/*.rake'
     - '**/db/fixtures/**/*'
+
+Discourse/Plugins/UseRequireRelative:
+  Enabled: true

lib/rubocop/cop/discourse/plugins/use_require_relative.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+module RuboCop
+  module Cop
+    module Discourse
+      module Plugins
+        class UseRequireRelative < Base
+          MSG = "Use `require_relative` instead of `load`."
+          RESTRICT_ON_SEND = [:load].freeze
+
+          def_node_matcher :load_called?, <<~MATCHER
+            (send nil? :load _)
+          MATCHER
+
+          def on_send(node)
+            return unless load_called?(node)
+            add_offense(node, message: MSG)
+          end
+        end
+      end
+    end
+  end
+end

spec/lib/rubocop/cop/plugins/use_require_relative_spec.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+
+RSpec.describe RuboCop::Cop::Discourse::Plugins::UseRequireRelative, :config do
+  subject(:cop) { described_class.new(config) }
+
+  let(:config) { RuboCop::Config.new }
+
+  context "when using `load`" do
+    it "registers an offense" do
+      expect_offense(<<~RUBY)
+        load File.expand_path("../app/jobs/onceoff/voting_ensure_consistency.rb", __FILE__)
+        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Discourse/Plugins/UseRequireRelative: Use `require_relative` instead of `load`.
+      RUBY
+    end
+  end
+
+  context "when using `require_relative`" do
+    it "does not register an offense" do
+      expect_no_offenses(<<~RUBY)
+        require_relative "app/controllers/encrypt_controller.rb"
+      RUBY
+    end
+  end
+end