
PASS Create a mark "existing_mark" 
PASS self.performance.measure("measure", "mark"), where "mark" is a non-existent mark, throws a SyntaxError exception. 
PASS self.performance.measure("measure", "mark", "existing_mark"), where "mark" is a non-existent mark, throws a SyntaxError exception. 
PASS self.performance.measure("measure", "existing_mark", "mark"), where "mark" is a non-existent mark, throws a SyntaxError exception. 
PASS self.performance.measure("measure", "mark", "mark"), where "mark" is a non-existent mark, throws a SyntaxError exception.