Add test case for issue rails#13437

(Preload/includes with multiple arguments fails in certain conditions)

activerecord/test/cases/associations/cascaded_eager_loading_test.rb

@@ -33,6 +33,20 @@ def test_eager_association_loading_with_cascaded_two_levels_and_one_level
     assert_equal 2, authors[1].categorizations.size
   end
 
+  def test_eager_association_loading_with_cascaded_interdependent_one_level_and_two_levels
+    authors_relation = Author.all.merge!(:includes=>[:comments, {:posts=>:categorizations}], :order=>"authors.id")
+    assert_nothing_raised do
+      authors_relation.to_a
+    end
+    authors = authors_relation.to_a
+    assert_equal 3, authors.size
+    assert_equal 10, authors[0].comments.size
+    assert_equal 1, authors[1].comments.size
+    assert_equal 5, authors[0].posts.size
+    assert_equal 3, authors[1].posts.size
+    assert_equal 3, authors[0].posts.collect{|post| post.categorizations.size }.inject(0){|sum,i| sum+i}
+  end
+
   def test_eager_association_loading_with_hmt_does_not_table_name_collide_when_joining_associations
     assert_nothing_raised do
       Author.joins(:posts).eager_load(:comments).where(:posts => {:taggings_count => 1}).to_a