Add specs for owner_tags_on and owner_tags methods

spec/acts_as_taggable_on/single_table_inheritance_spec.rb

@@ -170,11 +170,27 @@
       expect(taggable.tags_from(student)).to eq(%w(ruby scheme))
     end
 
+    it 'returns all owner tags on the taggable' do
+      student.tag(taggable, with: 'ruby, scheme', on: :tags)
+      student.tag(taggable, with: 'skill_one', on: :skills)
+      student.tag(taggable, with: 'english, spanish', on: :language)
+      expect(taggable.owner_tags(student).count).to eq(5)
+      expect(taggable.owner_tags(student).sort == %w(english ruby scheme skill_one spanish))
+    end
+
+
     it 'returns owner tags on the tagger' do
       student.tag(taggable, with: 'ruby, scheme', on: :tags)
       expect(taggable.owner_tags_on(student, :tags).count).to eq(2)
     end
 
+    it 'returns owner tags on the taggable for an array of contexts' do
+      student.tag(taggable, with: 'ruby, scheme', on: :tags)
+      student.tag(taggable, with: 'skill_one, skill_two', on: :skills)
+      expect(taggable.owner_tags_on(student, [:tags, :skills]).count).to eq(4)
+      expect(taggable.owner_tags_on(student, [:tags, :skills]).sort == %w(ruby scheme skill_one skill_two))
+    end
+
     it 'should scope objects returned by tagged_with by owners' do
       student.tag(taggable, with: 'ruby, scheme', on: :tags)
       expect(TaggableModel.tagged_with(%w(ruby scheme), owned_by: student).count).to eq(1)
@@ -208,4 +224,3 @@
     end
   end
 end
-