This tests that if a label element's children change, the string value updates

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS label.role is 'AXRole: AXStaticText'
PASS initialStringValue is 'AXValue: first choice'
PASS label.stringValue === 'AXValue: first foo choice'
PASS successfullyParsed is true

TEST COMPLETE
 firstfoo choice