Mocking an interface that says it extends Traversable requires adding an iterator to the mock

[koden-km]

Example:

interface SomeThingInterface extends \Traversable
{
}

Doing this will fatal:

$this->thing = Phony::mock(SomeThingInterface::class)

Work around requires adding IteratorAggregate as the first argument to the mock types:

$this->thing = Phony::mock(
    [
        IteratorAggregate::class,
        SomeThingInterface::class,
    ]
);