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Correl Roush
d399492679
If the monad being tested implements the new state behaviour, evaluate the expected value and the result by running them both against a default state before comparing them.
87 lines
3.2 KiB
Text
87 lines
3.2 KiB
Text
(defmacro evaluate-m (monad mval)
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`(cond ((: calrissian-util implements? 'state ,monad)
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(call ,monad 'run ,mval 'undefined))
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('true ,mval)))
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(defmacro is-equal-m (monad mval1 mval2)
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`(is-equal (evaluate-m ,monad ,mval1)
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(evaluate-m ,monad ,mval2)))
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(defmacro test-monad-functions (monad)
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`(progn
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(deftest monad->>=
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(is-equal-m ,monad (return ,monad 2)
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(>>= ,monad
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(return ,monad 1)
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(lambda (n) (return ,monad (+ 1 n))))))
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(deftest monad->>
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(is-equal-m ,monad (return ,monad 1)
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(>> ,monad
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(return ,monad 5)
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(return ,monad 1))))
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(deftest monad-do
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(is-equal-m ,monad (return ,monad 'ok)
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(do-m ,monad
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(return ,monad 'ignored)
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(return ,monad 'ok))))
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(deftest monad-do-binding
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(is-equal-m ,monad (return ,monad 9)
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(do-m ,monad
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(a <- (return ,monad 3))
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(return ,monad (* a a)))))
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(deftest monad-sequence
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(is-equal-m ,monad (return ,monad (list 1 2 3))
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(sequence ,monad (list (return ,monad 1)
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(return ,monad 2)
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(return ,monad 3)))))
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))
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(defmacro test-monad-laws (monad)
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`(progn
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(deftest monad-left-identity
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(let ((a 3)
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(f (lambda (n) (return ,monad (* 3 n)))))
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(is-equal-m ,monad (>>= ,monad (return ,monad a) f)
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(funcall f a))))
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(deftest monad-right-identity
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(let ((m (return ,monad 3)))
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(is-equal-m ,monad (>>= ,monad m (lambda (m') (return ,monad m')))
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m)))
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(deftest monad-associativity
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(let ((m (return ,monad 3))
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(f (lambda (n) (return ,monad (* 3 n))))
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(g (lambda (n) (return ,monad (+ 5 n)))))
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(is-equal-m ,monad (>>= ,monad (>>= ,monad m f) g)
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(>>= ,monad m (lambda (x) (>>= ,monad (funcall f x) g))))))
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(deftest monad-do-left-identity
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(let ((a 3)
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(f (lambda (n) (return ,monad (* 3 n)))))
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(is-equal-m ,monad (do-m ,monad (a' <- (return ,monad a))
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(funcall f a'))
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(do-m ,monad (funcall f a)))))
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(deftest monad-do-right-identity
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(let ((m (return ,monad 3)))
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(is-equal-m ,monad (do-m ,monad (x <- m)
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(return ,monad x))
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(do-m ,monad m))))
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(deftest monad-do-associativity
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(let ((m (return ,monad 3))
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(f (lambda (n) (return ,monad (* 3 n))))
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(g (lambda (n) (return ,monad (+ 5 n)))))
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(is-equal-m ,monad (do-m ,monad (y <- (do-m ,monad (x <- m)
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(funcall f x)))
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(funcall g y))
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(do-m ,monad (x <- m)
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(do-m ,monad (y <- (funcall f x))
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(funcall g y))))))
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))
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(defmacro test-monad (monad)
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`(progn
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(test-monad-functions ,monad)
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(test-monad-laws ,monad)))
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