
PASS addition of 2 time units: s plus s 
PASS addition of 2 time units: s plus ms 
PASS addition of 2 time units: ms plus ms 
PASS substraction of time unit: s minus s 
PASS substraction of time unit: s minus ms 
PASS multiplication of integer with a time unit: int multiplied by s 
PASS multiplication of integer with a time unit: int multiplied by ms 
PASS division of time unit with integer: s divided by int 
PASS division of time unit with integer: ms divided by int 
PASS conversion of time unit: ms into s