Question

I am new to Racket.

Can someone give me a simple example on how to use check expect in Racket, preferably with numbers?

Answer 1

The documentation is your best friend.

It’s really simple: the first parameter to check-expect is the expression or procedure to be tested, and the second one is the expected result (hence the name). Assuming that you’ve selected an adequate language (for example: Beginning Student)

(check-expect (+ 1 1) 2)
(check-expect (+ 1 1) 1)

The above will produce an output such as this:

Ran 2 tests.
1 of the 2 tests failed.

No signature violations.

Check failures:
    Actual value 2 differs from 1, the expected value.
at line 2, column 0