Test a function: Difference between revisions
Add bruijn
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4 tests, 4 assertions, 1 failures.</pre>
=={{header|Bruijn}}==
Bruijn has equivalency testing builtin. The <code>:test</code> instruction checks whether two terms are beta-equivalent (alpha-equivalent after beta-reduction) and prints an error if they aren't. Alpha-conversion is not needed because of the usage of De Bruijn indices. All tests in imported files get run automatically (can be disabled using a CLI flag).
<syntaxhighlight lang="bruijn">
:import std/String .
main [<~>0 =? 0]
:test (main "tacocat") ([[1]])
:test (main "bruijn") ([[1]])
</syntaxhighlight>
{{out}}
<pre>
ERROR test failed: (main [((0 [[[(0 (1 (0 (0 (0 (1 (1 (0 2))))))))]]]) [((0 [[[(0 (1 (0 (0 (1 (1 (1 (0 2))))))))]]]) [((0 [[[(1 (0 (1 (0 (1 (1 (1 (0 2))))))))]]]) [((0 [[[(1 (0 (0 (1 (0 (1 (1 (0 2))))))))]]]) [((0 [[[(0 (1 (0 (1 (0 (1 (1 (0 2))))))))]]]) [((0 [[[(0 (1 (1 (1 (0 (1 (1 (0 2))))))))]]]) [[0]])])])])])])]) = [[1]]
reduced to [[0]] = [[1]]
</pre>
=={{header|C}}==
Line 896 ⟶ 913:
->
</pre>
=={{header|Insitux}}==
It is possible to mock any built-in or user-defined function, and assert values are truthy. Testing [[Palindrome_detection#Insitux|Insitux's Palindrome detection entry]].
<syntaxhighlight lang="insitux">(var palindrome? (comp (filter letter?) lower-case (= (reverse %))))
;Arrange
(var calls [])
(function record f
(fn (var! calls (append f))
(... (unmocked f) args)))
(mock comp (record comp)
filter (record filter)
letter? (record letter?)
lower-case (record lower-case)
= (record =)
reverse (record reverse))
(var sentence "In girum imus nocte et consumimur igni.")
;Act
(var result (palindrome? sentence))
(unmock comp filter letter? lower-case = reverse)
;Assert
(assert result)
(var occurred (freqs calls))
(assert (= (len sentence) (occurred letter?))) ;letter? is called (len sentence) times
(assert (... = 1 (map occurred [filter lower-case reverse =]))) ;other functions are called only once</syntaxhighlight>
=={{header|J}}==
Line 2,459 ⟶ 2,507:
=={{header|Wren}}==
{{libheader|Wren-test}}
<syntaxhighlight lang="
var isPal = Fn.new { |word| word == ((word.count > 0) ? word[-1..0] : "") }
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