mirror of
https://github.com/correl/calrissian.git
synced 2024-11-27 11:09:58 +00:00
44 lines
1.6 KiB
Text
44 lines
1.6 KiB
Text
(defmacro test-monad-laws (monad)
|
|
`(progn
|
|
(deftest monad-left-identity
|
|
(let ((a 3)
|
|
(f (lambda (n) (return ,monad (* 3 n)))))
|
|
(is-equal (>>= ,monad (return ,monad a) f)
|
|
(funcall f a))))
|
|
|
|
(deftest monad-right-identity
|
|
(let ((m (return ,monad 3)))
|
|
(is-equal (>>= ,monad m (lambda (m') (return ,monad m')))
|
|
m)))
|
|
|
|
(deftest monad-associativity
|
|
(let ((m (return ,monad 3))
|
|
(f (lambda (n) (return ,monad (* 3 n))))
|
|
(g (lambda (n) (return ,monad (+ 5 n)))))
|
|
(is-equal (>>= ,monad (>>= ,monad m f) g)
|
|
(>>= ,monad m (lambda (x) (>>= ,monad (funcall f x) g))))))
|
|
|
|
(deftest monad-do-left-identity
|
|
(let ((a 3)
|
|
(f (lambda (n) (return ,monad (* 3 n)))))
|
|
(is-equal (do ,monad (a' <- (return ,monad a))
|
|
(funcall f a'))
|
|
(do ,monad (funcall f a)))))
|
|
|
|
(deftest monad-do-right-identity
|
|
(let ((m (return ,monad 3)))
|
|
(is-equal (do ,monad (x <- m)
|
|
(return ,monad x))
|
|
(do ,monad m))))
|
|
|
|
(deftest monad-do-associativity
|
|
(let ((m (return ,monad 3))
|
|
(f (lambda (n) (return ,monad (* 3 n))))
|
|
(g (lambda (n) (return ,monad (+ 5 n)))))
|
|
(is-equal (do ,monad (y <- (do ,monad (x <- m)
|
|
(funcall f x)))
|
|
(funcall g y))
|
|
(do ,monad (x <- m)
|
|
(do ,monad (y <- (funcall f x))
|
|
(funcall g y))))))
|
|
))
|