Custom date field accepts invalid dates (#9394).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@7779 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/custom_value_test.rb

@@ -64,6 +64,8 @@ class CustomValueTest < ActiveSupport::TestCase
     assert v.valid?
     v.value = 'abc'
     assert !v.valid?
+    v.value = '1975-07-33'
+    assert !v.valid?
     v.value = '1975-07-14'
     assert v.valid?
   end