Fix `search` class method for IssueCommonality

Also adds specs to the two affected classes that would have caught my
dumb mistake.

app/roles/issue_commonality.rb

@@ -36,9 +36,11 @@ module IssueCommonality
     attr_accessor :author_id_of_changes
   end
 
-  def self.search query
+  module ClassMethods
+    def search(query)
       where("title like :query", :query => "%#{query}%")
     end
+  end
 
   def today?
     Date.today == created_at.to_date

spec/models/issue_spec.rb

@@ -106,6 +106,14 @@ describe Issue do
     end
   end
 
+  describe ".search" do
+    let!(:issue) { Factory.create(:issue, :title => "Searchable issue",
+                                 :project => Factory.create(:project)) }
+
+    it "matches by title" do
+      Issue.search('able').all.should == [issue]
+    end
+  end
 end
 # == Schema Information
 #

spec/models/merge_request_spec.rb

@@ -56,6 +56,15 @@ describe MergeRequest do
       subject.upvotes.should == 2
     end
   end
+
+  describe ".search" do
+    let!(:issue) { Factory.create(:issue, :title => "Searchable issue",
+                                 :project => Factory.create(:project)) }
+
+    it "matches by title" do
+      Issue.search('able').all.should == [issue]
+    end
+  end
 end
 # == Schema Information
 #