Test programs according to good software engineering principles.
Consider the following not-yet-implemented procedure.
;;; (median numbers) -> real?
;;; numbers : list-of real?
;;; Find the median of a list of a nonempty list of numbers using
;;; the standard approach.
(define median
(lambda (numbers)
(car numbers))) ; Incorrect, but a good placeholder.
Write a set of tests for median using the test-= and/or test-equals? methods. Make sure to include at least three “expected” cases and at least three “edge” cases.
Here are some examples to get you started.
(test-= "An easy list of integers"
(median '(1 2 3))
2
0
"An easy list of integers")
(test-= "A list of exact and inexact numbers of even length"
(median '(1.0 2 3 4))
2.5
0.00000001)