Add tests for Project#pages_lookup_path

spec/models/project_spec.rb

@@ -5012,6 +5012,17 @@ describe Project do
     end
   end
 
+  describe '#pages_lookup_path' do
+    let(:pages_domain) { build(:pages_domain) }
+    let(:project) { build(:project) }
+
+    it 'returns instance of Pages::LookupPath' do
+      expect(Pages::LookupPath).to receive(:new).with(project, domain: pages_domain).and_call_original
+
+      expect(project.pages_lookup_path(domain: pages_domain)).to be_a(Pages::LookupPath)
+    end
+  end
+
   def rugged_config
     rugged_repo(project.repository).config
   end