Tests: Raise exception, don't raise string.

Tests: Raise exception, don't raise string.

This was deprecated ~ python 2.4, and causes a TypeError as sideEffect.

>>> raise "foo"
Traceback (most recent call last):
  File "<input>", line 1, in <module>
TypeError: exceptions must derive from BaseException

Change-Id: I4117b6d60ae896eaa1ef2a73a323d8d241f8c3a7
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>