def test_class_handler_registry():
my_handler_registry = ClassFactRegistry()
# The predicate doesn't matter here, so just use is_true
fact1 = Equivalent(Q.is_true, AllArgs(Q.is_true))
fact2 = Equivalent(Q.is_true, AnyArgs(Q.is_true))
my_handler_registry[Mul] = {fact1}
my_handler_registry[Expr] = {fact2}
assert my_handler_registry[Basic] == set()
assert my_handler_registry[Expr] == {fact2}
assert my_handler_registry[Mul] == {fact1, fact2}
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