Fix method redefined warnings.

activemodel/test/cases/validations/exclusion_validation_test.rb

@@ -78,6 +78,9 @@ def p.reserved_karmas
     assert p.invalid?
     assert_equal ["is reserved"], p.errors[:karma]
 
+    p = Person.new
+    p.karma = "abe"
+
     def p.reserved_karmas
       %w()
     end

activemodel/test/cases/validations/inclusion_validation_test.rb

@@ -110,6 +110,9 @@ def p.available_karmas
     assert p.invalid?
     assert_equal ["is not included in the list"], p.errors[:karma]
 
+    p = Person.new
+    p.karma = "Lifo"
+
     def p.available_karmas
       %w(Lifo)
     end