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<pre><a name="line-1"></a><span class='hs-comment'>-- | HUnit is a unit testing framework for Haskell, inspired by the JUnit tool</span>
<a name="line-2"></a><span class='hs-comment'>-- for Java. This guide describes how to use HUnit, assuming you are familiar</span>
<a name="line-3"></a><span class='hs-comment'>-- with Haskell, though not necessarily with JUnit.</span>
<a name="line-4"></a><span class='hs-comment'>--</span>
<a name="line-5"></a><span class='hs-comment'>-- In the Haskell module where your tests will reside, import module</span>
<a name="line-6"></a><span class='hs-comment'>-- @Test.HUnit@:</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- @</span>
<a name="line-9"></a><span class='hs-comment'>-- import Test.HUnit</span>
<a name="line-10"></a><span class='hs-comment'>-- @</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- Define test cases as appropriate:</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-- @</span>
<a name="line-15"></a><span class='hs-comment'>-- test1 = TestCase (assertEqual \"for (foo 3),\" (1,2) (foo 3))</span>
<a name="line-16"></a><span class='hs-comment'>-- test2 = TestCase (do (x,y) <- partA 3</span>
<a name="line-17"></a><span class='hs-comment'>-- assertEqual \"for the first result of partA,\" 5 x</span>
<a name="line-18"></a><span class='hs-comment'>-- b <- partB y</span>
<a name="line-19"></a><span class='hs-comment'>-- assertBool (\"(partB \" ++ show y ++ \") failed\") b)</span>
<a name="line-20"></a><span class='hs-comment'>-- @</span>
<a name="line-21"></a><span class='hs-comment'>--</span>
<a name="line-22"></a><span class='hs-comment'>-- Name the test cases and group them together:</span>
<a name="line-23"></a><span class='hs-comment'>--</span>
<a name="line-24"></a><span class='hs-comment'>-- @</span>
<a name="line-25"></a><span class='hs-comment'>-- tests = TestList [TestLabel \"test1\" test1, TestLabel \"test2\" test2]</span>
<a name="line-26"></a><span class='hs-comment'>-- @</span>
<a name="line-27"></a><span class='hs-comment'>--</span>
<a name="line-28"></a><span class='hs-comment'>-- Run the tests as a group. At a Haskell interpreter prompt, apply the function</span>
<a name="line-29"></a><span class='hs-comment'>-- @runTestTT@ to the collected tests. (The /TT/ suggests /T/ext orientation</span>
<a name="line-30"></a><span class='hs-comment'>-- with output to the /T/erminal.)</span>
<a name="line-31"></a><span class='hs-comment'>--</span>
<a name="line-32"></a><span class='hs-comment'>-- @</span>
<a name="line-33"></a><span class='hs-comment'>-- \> runTestTT tests</span>
<a name="line-34"></a><span class='hs-comment'>-- Cases: 2 Tried: 2 Errors: 0 Failures: 0</span>
<a name="line-35"></a><span class='hs-comment'>-- \></span>
<a name="line-36"></a><span class='hs-comment'>-- @</span>
<a name="line-37"></a><span class='hs-comment'>--</span>
<a name="line-38"></a><span class='hs-comment'>-- If the tests are proving their worth, you might see:</span>
<a name="line-39"></a><span class='hs-comment'>--</span>
<a name="line-40"></a><span class='hs-comment'>-- @</span>
<a name="line-41"></a><span class='hs-comment'>-- \> runTestTT tests</span>
<a name="line-42"></a><span class='hs-comment'>-- ### Failure in: 0:test1</span>
<a name="line-43"></a><span class='hs-comment'>-- for (foo 3),</span>
<a name="line-44"></a><span class='hs-comment'>-- expected: (1,2)</span>
<a name="line-45"></a><span class='hs-comment'>-- but got: (1,3)</span>
<a name="line-46"></a><span class='hs-comment'>-- Cases: 2 Tried: 2 Errors: 0 Failures: 1</span>
<a name="line-47"></a><span class='hs-comment'>-- \></span>
<a name="line-48"></a><span class='hs-comment'>-- @</span>
<a name="line-49"></a><span class='hs-comment'>--</span>
<a name="line-50"></a><span class='hs-comment'>-- You can specify tests even more succinctly using operators and overloaded</span>
<a name="line-51"></a><span class='hs-comment'>-- functions that HUnit provides:</span>
<a name="line-52"></a><span class='hs-comment'>--</span>
<a name="line-53"></a><span class='hs-comment'>-- @</span>
<a name="line-54"></a><span class='hs-comment'>-- tests = test [ \"test1\" ~: \"(foo 3)\" ~: (1,2) ~=? (foo 3),</span>
<a name="line-55"></a><span class='hs-comment'>-- \"test2\" ~: do (x, y) <- partA 3</span>
<a name="line-56"></a><span class='hs-comment'>-- assertEqual \"for the first result of partA,\" 5 x</span>
<a name="line-57"></a><span class='hs-comment'>-- partB y \@? \"(partB \" ++ show y ++ \") failed\" ]</span>
<a name="line-58"></a><span class='hs-comment'>-- @</span>
<a name="line-59"></a><span class='hs-comment'>--</span>
<a name="line-60"></a><span class='hs-comment'>-- Assuming the same test failures as before, you would see:</span>
<a name="line-61"></a><span class='hs-comment'>--</span>
<a name="line-62"></a><span class='hs-comment'>-- @</span>
<a name="line-63"></a><span class='hs-comment'>-- \> runTestTT tests</span>
<a name="line-64"></a><span class='hs-comment'>-- ### Failure in: 0:test1:(foo 3)</span>
<a name="line-65"></a><span class='hs-comment'>-- expected: (1,2)</span>
<a name="line-66"></a><span class='hs-comment'>-- but got: (1,3)</span>
<a name="line-67"></a><span class='hs-comment'>-- Cases: 2 Tried: 2 Errors: 0 Failures: 1</span>
<a name="line-68"></a><span class='hs-comment'>-- \></span>
<a name="line-69"></a><span class='hs-comment'>-- @</span>
<a name="line-70"></a>
<a name="line-71"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Test</span><span class='hs-varop'>.</span><span class='hs-conid'>HUnit</span>
<a name="line-72"></a><span class='hs-layout'>(</span>
<a name="line-73"></a> <span class='hs-keyword'>module</span> <span class='hs-conid'>Test</span><span class='hs-varop'>.</span><span class='hs-conid'>HUnit</span><span class='hs-varop'>.</span><span class='hs-conid'>Base</span><span class='hs-layout'>,</span>
<a name="line-74"></a> <span class='hs-keyword'>module</span> <span class='hs-conid'>Test</span><span class='hs-varop'>.</span><span class='hs-conid'>HUnit</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span>
<a name="line-75"></a><span class='hs-layout'>)</span>
<a name="line-76"></a><span class='hs-keyword'>where</span>
<a name="line-77"></a>
<a name="line-78"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Test</span><span class='hs-varop'>.</span><span class='hs-conid'>HUnit</span><span class='hs-varop'>.</span><span class='hs-conid'>Base</span>
<a name="line-79"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Test</span><span class='hs-varop'>.</span><span class='hs-conid'>HUnit</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span>
<a name="line-80"></a>
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