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56 lines
2.3 KiB
56 lines
2.3 KiB
(require 'ert) |
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(require 'bang) |
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(defun even? (num) (= 0 (% num 2))) |
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(defun square (num) (* num num)) |
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(ert-deftest filter () |
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"`!filter' returns a new list of only those elements where the predicate was non-nil." |
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(should (equal (!filter (lambda (num) (= 0 (% num 2))) '(1 2 3 4)) '(2 4))) |
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(should (equal (!filter (= 0 (% it 2)) '(1 2 3 4)) '(2 4))) |
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(should (equal (!filter even? '(1 2 3 4)) '(2 4)))) |
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(ert-deftest map () |
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"`!map' returns a new list with the results of calling the function on each element." |
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(should (equal (!map (lambda (num) (* num num)) '(1 2 3 4)) '(1 4 9 16))) |
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(should (equal (!map (* it it) '(1 2 3 4)) '(1 4 9 16))) |
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(should (equal (!map square '(1 2 3 4)) '(1 4 9 16)))) |
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(ert-deftest reduce () |
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"`!reduce' takes a list and applies the function over them to create one result" |
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(should (equal (!reduce + '()) 0)) |
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(should (equal (!reduce + '(1)) 1)) |
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(should (equal (!reduce + '(1 2)) 3)) |
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(should (equal (!reduce-from + 7 '()) 7)) |
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(should (equal (!reduce-from + 7 '(1)) 8)) |
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(should (equal (!reduce-from + 7 '(1 2)) 10)) |
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(should (equal (!reduce (lambda (memo item) (format "%s-%s" memo item)) '(1 2 3)) "1-2-3")) |
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(should (equal (!reduce (format "%s-%s" acc it) '(1 2 3)) "1-2-3")) |
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(should (equal (!reduce (format "%s-%s" acc it) '()) "nil-nil")) |
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) |
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(ert-deftest difference () |
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"`!difference' returns a new list of only elements in list1 that are not in list2." |
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(should (equal (!difference '() '()) '())) |
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(should (equal (!difference '(1 2 3) '(4 5 6)) '(1 2 3))) |
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(should (equal (!difference '(1 2 3 4) '(3 4 5 6)) '(1 2)))) |
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(ert-deftest intersection () |
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"`!intersection' returns a new list of only elements that are in both given lists." |
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(should (equal (!intersection '() '()) '())) |
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(should (equal (!intersection '(1 2 3) '(4 5 6)) '())) |
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(should (equal (!intersection '(1 2 3 4) '(3 4 5 6)) '(3 4)))) |
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(ert-deftest uniq () |
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"`!uniq' returns a new list of only unique elements." |
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(should (equal (!uniq '()) '())) |
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(should (equal (!uniq '(1 2 2 4)) '(1 2 4)))) |
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(ert-deftest contains-p () |
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"`!contains-p' returns t if the list contains the element." |
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(should (!contains-p '(1 2 3) 1)) |
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(should (!contains-p '(1 2 3) 2)) |
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(should (not (!contains-p '() '()))) |
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(should (not (!contains-p '() 1))) |
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(should (not (!contains-p '(1 2 4) 3))))
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