@Test
    void testNameCollision() throws Exception {
        assertCorrectDeriving("namecollision", "collisionstruct",
                new TestProperties(),
                new TestableDeployLogger());
        DocumentTypeManager.fromFile("temp/namecollision/documentmanager.cfg");
    }
Verifies that a struct in a document type is preferred over another document type
of the same name.

@author bratseth
config-model/src/test/java/com/yahoo/schema/derived/NameCollisionTestCase.java