jamesfredley commented on code in PR #16480:
URL: https://github.com/apache/grails-core/pull/16480#discussion_r4174316840


##########
grails-data-hibernate7/core/src/test/groovy/org/grails/orm/hibernate/UserTypeMappingSpec.groovy:
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@@ -0,0 +1,204 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *    https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.grails.orm.hibernate
+
+import java.sql.PreparedStatement
+import java.sql.ResultSet
+import java.sql.SQLException
+import java.sql.Types
+
+import groovy.transform.CompileStatic
+
+import grails.gorm.annotation.Entity
+import grails.gorm.hibernate.HibernateEntity
+import org.grails.datastore.mapping.core.DatastoreUtils
+import org.grails.orm.hibernate.cfg.Settings
+import org.hibernate.mapping.SimpleValue
+import org.hibernate.type.descriptor.WrapperOptions
+import org.hibernate.usertype.UserType
+import spock.lang.Specification
+import spock.lang.Unroll
+
+class UserTypeMappingSpec extends Specification {
+
+    @Unroll
+    void "a user-type in the default mapping given as #description applies to 
every entity"() {

Review Comment:
   The default-mapping test says the user type applies to every entity, but 
only `UserTypeFlag` is registered. The class-local case (line 81) and the 
precedence case (line 97) also distinguish scope mainly through `typeNameOf`, 
which reads Hibernate metadata. A Boolean round-trip alone would still pass if 
the custom type were not bound.
   
   Non-blocking follow-up: register and persist two entities in the default 
case, persist the unaffected entity in the class-local case, and assert 
standard physical Boolean storage for the unaffected and overridden properties. 
The Class-versus-string regression itself is already covered by the save/read 
and the `Y`/`N` column checks.



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