Keep #absolute_image_urls as a private instance method

lib/gitlab/hook_data/base_builder.rb

@@ -17,7 +17,9 @@ module Gitlab
         @object = object
       end
 
-      def self.absolute_image_urls(markdown_text)
+      private
+
+      def absolute_image_urls(markdown_text)
         return markdown_text unless markdown_text.present?
 
         markdown_text.gsub(MARKDOWN_SIMPLE_IMAGE) do
@@ -31,12 +33,6 @@ module Gitlab
           end
         end
       end
-
-      private
-
-      def absolute_image_urls(markdown_text)
-        self.class.absolute_image_urls(markdown_text)
-      end
     end
   end
 end

spec/lib/gitlab/hook_data/base_builder_spec.rb

 require 'spec_helper'
 
 describe Gitlab::HookData::BaseBuilder do
-  describe '.absolute_image_urls' do
+  describe '#absolute_image_urls' do
+    let(:subclass) do
+      Class.new(described_class) do
+        public :absolute_image_urls
+      end
+    end
+
+    subject { subclass.new(nil) }
+
     using RSpec::Parameterized::TableSyntax
 
     where do
@@ -50,7 +58,7 @@ describe Gitlab::HookData::BaseBuilder do
     end
 
     with_them do
-      it { expect(described_class.absolute_image_urls(input)).to eq(output) }
+      it { expect(subject.absolute_image_urls(input)).to eq(output) }
     end
   end
 end