1 files changed, 25 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 f4d14853d3..d8d2a113ff 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
@@ -101,6 +101,16 @@ class HasAndBelongsToManyAssociationsTest < ActiveRecord::TestCase
     assert_equal 't1', record[1]
   end
 
+  def test_proper_usage_of_primary_keys_and_join_table
+    setup_data_for_habtm_case
+
+    assert_equal 'country_id', Country.primary_key
+    assert_equal 'treaty_id', Treaty.primary_key
+
+    country = Country.first
+    assert_equal 1, country.treaties.count
+  end
+
   def test_has_and_belongs_to_many
     david = Developer.find(1)
 
@@ -235,6 +245,21 @@ class HasAndBelongsToManyAssociationsTest < ActiveRecord::TestCase
     assert_equal Developer.find(1).projects.sort_by(&:id).last, proj  # prove join table is updated
   end
 
+  def test_new_aliased_to_build
+    devel = Developer.find(1)
+    proj = assert_no_queries { devel.projects.new("name" => "Projekt") }
+    assert !devel.projects.loaded?
+
+    assert_equal devel.projects.last, proj
+    assert devel.projects.loaded?
+
+    assert !proj.persisted?
+    devel.save
+    assert proj.persisted?
+    assert_equal devel.projects.last, proj
+    assert_equal Developer.find(1).projects.sort_by(&:id).last, proj  # prove join table is updated
+  end
+
   def test_build_by_new_record
     devel = Developer.new(:name => "Marcel", :salary => 75000)
     devel.projects.build(:name => "Make bed")