public void assertValidation(List<VespaConfigChangeAction> exp) {
        List<VespaConfigChangeAction> act = validate();
        assertEquals(exp, act);
    }
Test fixture to setup current and next content clusters used for change validation.

@author geirst
config-model/src/test/java/com/yahoo/vespa/model/application/validation/change/search/ContentClusterFixture.java