If I am correct, SimpleTest will allow you to assert a PHP error is thrown. However, I can't figure out how to use it, based on the documentation. I want to assert that the object I pass into my constructor is an instance of `MyOtherObject`

```
class Object {
    public function __construct(MyOtherObject $object) {
        //do something with $object
    }
}

//...and in my test I have...
public function testConstruct_ExpectsAnInstanceOfMyOtherObject() {
    $notAnObject = 'foobar';
    $object = new Object($notAnObject);
    $this->expectError($object);
}

```

Where am I going wrong?