Created a test for has_many :through presence validation issue

activerecord/test/cases/associations/has_many_through_associations_test.rb

@@ -901,4 +901,11 @@ def test_has_many_through_with_polymorphic_source
     readers(:michael_authorless).update(first_post_id: 1)
     assert_equal [posts(:thinking)], person.reload.first_posts
   end
+
+  def test_creating_new_object_passes_presence_validation
+    club = members(:groucho).clubs.create!
+
+    member = Member.new(clubs: [club])
+    assert member.valid?, "Creating a new member with a club should pass club and member uniqueness validations"
+  end
 end

activerecord/test/models/membership.rb

@@ -6,6 +6,8 @@ class Membership < ActiveRecord::Base
 class CurrentMembership < Membership
   belongs_to :member
   belongs_to :club
+
+  validates_presence_of :member, :club
 end
 
 class SelectedMembership < Membership