Merge pull request rails#27993 from koic/fix_test_ar_value_too_long_using_oracle

Fix a tests of AR::ValueTooLong when using OracleAdapter

Author: eileencodes

activerecord/test/cases/validations/uniqueness_validation_test.rb

@@ -372,7 +372,7 @@ def test_validate_uniqueness_with_limit
 
       e2 = Event.create(title: "abcdefgh")
       assert_not e2.valid?, "Created an event whose title is not unique"
-    elsif current_adapter?(:Mysql2Adapter, :PostgreSQLAdapter, :SQLServerAdapter)
+    elsif current_adapter?(:Mysql2Adapter, :PostgreSQLAdapter, :OracleAdapter, :SQLServerAdapter)
       assert_raise(ActiveRecord::ValueTooLong) do
         Event.create(title: "abcdefgh")
       end
@@ -391,7 +391,7 @@ def test_validate_uniqueness_with_limit_and_utf8
 
       e2 = Event.create(title: "一二三四五六七八")
       assert_not e2.valid?, "Created an event whose title is not unique"
-    elsif current_adapter?(:Mysql2Adapter, :PostgreSQLAdapter, :SQLServerAdapter)
+    elsif current_adapter?(:Mysql2Adapter, :PostgreSQLAdapter, :OracleAdapter, :SQLServerAdapter)
       assert_raise(ActiveRecord::ValueTooLong) do
         Event.create(title: "一二三四五六七八")
       end