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-rw-r--r--activerecord/test/cases/associations/has_many_through_associations_test.rb10
1 files changed, 10 insertions, 0 deletions
diff --git a/activerecord/test/cases/associations/has_many_through_associations_test.rb b/activerecord/test/cases/associations/has_many_through_associations_test.rb
index 2f4dd9e55c..115e06144e 100644
--- a/activerecord/test/cases/associations/has_many_through_associations_test.rb
+++ b/activerecord/test/cases/associations/has_many_through_associations_test.rb
@@ -67,6 +67,16 @@ class HasManyThroughAssociationsTest < ActiveRecord::TestCase
end
end
+ def test_associate_existing_record_twice_should_add_records_twice
+ post = posts(:thinking)
+ person = people(:david)
+
+ assert_difference 'post.people.count', 2 do
+ post.people << person
+ post.people << person
+ end
+ end
+
def test_associating_new
assert_queries(1) { posts(:thinking) }
new_person = nil # so block binding catches it