add test cases

test/unit/post_test.rb

@@ -764,6 +764,20 @@ class PostTest < ActiveSupport::TestCase
       end
     end
   end
+  
+  context "Paginating:" do
+    setup do
+      CurrentUser.user.stubs(:per_page).returns(3)
+      4.times do
+        FactoryGirl.create(:post)
+      end
+    end
+    
+    should "delegate the default limit to the user" do
+      posts = Post.tag_match("").paginate(1).all
+      assert_equal(3, posts.size)
+    end
+  end
 
   context "Searching:" do
     should "return posts for the ' tag" do