Grails - testing custom validator on domain class issue?

You should not use unit tests or mocking to test domain classes. Grails does create a unit test for domain classes and this should be changed. Move the class to the same package and folder under test/integration and change the base class to GroovyTestCase and you'll have a proper test that runs with the in-memory database and tests persistence, not the mocking framework.

You're missing the mockForConstraintsTests() call. The common pattern is to do this in setUp().

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