votes up 1

the required argument should be a list of interfaces, not a single interface

Exception Class:

Raise code

    required = factory.__component_adapts__
        except AttributeError:
            raise TypeError(
                "The adapter factory doesn't have a __component_adapts__ "
                "attribute and no required specifications were specified"
    elif ISpecification.providedBy(required):
        raise TypeError("the required argument should be a list of "
                        "interfaces, not a single interface")

    result = []
    for r in required:
        if r is None:
            r = Interface
        elif not ISpecification.providedBy(r):
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