T obj1 = new T(property: 'whatever')
S obj2 = new S(property: 'meh')

def objA = obj1.copy()
def objB = obj2.copy()

assert objA.class == T
assert objA == obj1 && ! objA.is(obj1) // same values, not same instance

assert objB.class == S
assert objB == obj2 && ! objB.is(obj2) // same values, not same instance

println "objA:: name: ${objA.name()}, property: ${objA.property}"
println "objB:: name: ${objB.name()}, property: ${objB.property}"