I'd have to agree with some of the other respondents to this thread. Testing is important. It is one of two ways a person can perform under stress. The other situation is doing a public demonstration.
I've seen my instructors give a scheduled test to students and when one student failed to show for the testing, they just waited until the next class the student showed up.
The next class went on as scheduled, but in the last part of the class, the test was given to the absent student.