1 files changed, 24 insertions, 0 deletions
diff --git a/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb b/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb
index 5d33634da2..cfdfff6af9 100644
--- a/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb
+++ b/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb
@@ -83,6 +83,12 @@ class HasAndBelongsToManyAssociationsTest < ActiveRecord::TestCase
     country.treaties << treaty
   end
 
+  def test_marshal_dump
+    post = posts :welcome
+    preloaded = Post.includes(:categories).find post.id
+    assert_equal preloaded, Marshal.load(Marshal.dump(preloaded))
+  end
+
   def test_should_property_quote_string_primary_keys
     setup_data_for_habtm_case
 
@@ -217,6 +223,24 @@ class HasAndBelongsToManyAssociationsTest < ActiveRecord::TestCase
     assert_equal developers(:poor_jamis, :jamis, :david), projects(:active_record).developers
   end
 
+  def test_habtm_collection_size_from_build
+    devel = Developer.create("name" => "Fred Wu")
+    devel.projects << Project.create("name" => "Grimetime")
+    devel.projects.build
+
+    assert_equal 2, devel.projects.size
+  end
+
+  def test_habtm_collection_size_from_params
+    devel = Developer.new({
+      projects_attributes: {
+        '0' => {}
+      }
+    })
+
+    assert_equal 1, devel.projects.size
+  end
+
   def test_build
     devel = Developer.find(1)
     proj = assert_no_queries { devel.projects.build("name" => "Projekt") }