1 files changed, 16 insertions, 0 deletions
diff --git a/activerecord/test/locking_test.rb b/activerecord/test/locking_test.rb
index 5b23aab515..b0d6f8417f 100644
--- a/activerecord/test/locking_test.rb
+++ b/activerecord/test/locking_test.rb
@@ -10,6 +10,10 @@ class LockWithCustomColumnWithoutDefault < ActiveRecord::Base
   set_locking_column :custom_lock_version
 end
 
+class ReadonlyFirstNamePerson < Person
+  attr_readonly :first_name
+end
+
 class OptimisticLockingTest < Test::Unit::TestCase
   fixtures :people, :legacy_things
 
@@ -94,6 +98,18 @@ class OptimisticLockingTest < Test::Unit::TestCase
     assert_equal 0, t1.custom_lock_version
   end
 
+  def test_readonly_attributes
+    assert_equal [ :first_name ], ReadonlyFirstNamePerson.readonly_attributes
+
+    p = ReadonlyFirstNamePerson.create(:first_name => "unchangeable name")
+    p.reload
+    assert_equal "unchangeable name", p.first_name
+
+    p.update_attributes(:first_name => "changed name")
+    p.reload
+    assert_equal "unchangeable name", p.first_name
+  end
+
   { :lock_version => Person, :custom_lock_version => LegacyThing }.each do |name, model|
     define_method("test_increment_counter_updates_#{name}") do
       counter_test model, 1 do |id|