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<title data-rh="true">10th seminar | mf</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://blog.mfocko.xyz/c/bonuses/seminar-10/"><meta data-rh="true" property="og:locale" content="en"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-c-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-c-current"><meta data-rh="true" property="og:title" content="10th seminar | mf"><meta data-rh="true" name="description" content="Finding bugs in a hangman.
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itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/c/category/bonuses/"><span itemprop="name">Bonuses</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">10th seminar</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>10th seminar</h1></header><p><a href="/files/c/bonuses/10.tar.gz" target="_blank" rel="noopener noreferrer">Source</a></p>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="introduction">Introduction<a href="#introduction" class="hash-link" aria-label="Direct link to Introduction" title="Direct link to Introduction"></a></h2>
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<p>For this bonus you are given almost finished project - The Hangman Game. Your
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task is to try the game, in case you find any bugs point them out and cover as
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much of the game as possible with tests.</p>
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<p>For this bonus you can get at maximum 2 K₡.</p>
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<table><thead><tr><th>Item</th><th>Bonus</th></tr></thead><tbody><tr><td>Fixing bugs from failing tests</td><td>0.25</td></tr><tr><td><code>word_guessed</code></td><td>0.50</td></tr><tr><td>Hidden bug</td><td>0.50</td></tr><tr><td>Extending tests, undetectable bugs or evil bug</td><td>0.37</td></tr><tr><td>Refactor</td><td>0.38</td></tr></tbody></table>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="project">Project<a href="#project" class="hash-link" aria-label="Direct link to Project" title="Direct link to Project"></a></h2>
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<p>Project consists of 2 source files - <code>hangman.c</code> and <code>main.c</code>.</p>
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<p><code>main.c</code> is quite short and concise, there is nothing for you to do.</p>
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<p><code>hangman.c</code> contains implementation of the game. In case you feel lost, consult
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the documentation in <code>hangman.h</code> that represents an interface that can be used
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for implementing the game.</p>
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<p>Apart from those sources this project is a bit more complicated. <em>Game loop</em> is
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realised via single encapsulated function that complicates the testing. Because
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of that, there are 2 kinds of tests:</p>
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<ul>
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<li>
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<p><em>Unit tests</em> - that are present in <code>test_hangman.c</code> and can be run via:</p>
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<div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:hsl(230, 1%, 98%);--prism-color:hsl(230, 8%, 24%)"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar" style="background-color:hsl(230, 1%, 98%);color:hsl(230, 8%, 24%)"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:hsl(230, 8%, 24%)"><span class="token plain">$ make check-unit</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
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<p>They cover majorly functions that can be tested easily via testing framework.</p>
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</li>
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<li>
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<p><em>Functional tests</em> - same as in <code>seminar-08</code> and are focused on testing the
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program as whole. Basic smoke test is already included in <code>usage</code> test case.</p>
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<p>They can be run via:</p>
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<div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:hsl(230, 1%, 98%);--prism-color:hsl(230, 8%, 24%)"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar" style="background-color:hsl(230, 1%, 98%);color:hsl(230, 8%, 24%)"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:hsl(230, 8%, 24%)"><span class="token plain">$ make check-functional</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
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<p>When testing <code>hangman</code> function (the game loop), it is suggested to create
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functional tests.</p>
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<p>When submitting the files for review, please leave out functional tests that
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were given as a part of the assignment, so that it is easier to navigate, I
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will drag the common files myself. :)</p>
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</li>
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</ul>
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<blockquote>
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<p>Whole test suite can be run via:</p>
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<div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:hsl(230, 1%, 98%);--prism-color:hsl(230, 8%, 24%)"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar" style="background-color:hsl(230, 1%, 98%);color:hsl(230, 8%, 24%)"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:hsl(230, 8%, 24%)"><span class="token plain">$ make check</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
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</blockquote>
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<h3 class="anchor anchorWithStickyNavbar_LWe7" id="summary-of-the-gameplay">Summary of the gameplay<a href="#summary-of-the-gameplay" class="hash-link" aria-label="Direct link to Summary of the gameplay" title="Direct link to Summary of the gameplay"></a></h3>
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<ol>
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<li>Secret word gets chosen from the file that's path is given as an argument.</li>
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<li>You get 8 guesses.</li>
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<li>Invalid characters don't count.</li>
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<li>Already guessed characters don't count, even if not included in the secret.</li>
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<li>You can guess the whole word at once<!-- -->
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<ul>
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<li>If you get it right, you won, game ends.</li>
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<li>If you don't get it right, you get to see the secret, game ends.</li>
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</ul>
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</li>
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<li>In case of end of input, game finishes via force.</li>
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<li>In case of invalid input, no guesses are subtracted, game carries on.</li>
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<li>Letters and words are not case sensitive.</li>
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</ol>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="suggested-workflow">Suggested workflow<a href="#suggested-workflow" class="hash-link" aria-label="Direct link to Suggested workflow" title="Direct link to Suggested workflow"></a></h2>
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<p>As we have talked about on the seminar, I suggest you to follow
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<em>Test-Driven Development</em>
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in this case.</p>
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<p><img decoding="async" loading="lazy" alt="TDD workflow" src="/assets/images/tdd_lifecycle-327ad9ee0ed8318ed11e19a28e02b2cc.png" width="2814" height="1652" class="img_ev3q"></p>
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<p>In our current scenario we are already in the stage of refactoring and fixing the
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bugs. Therefore try to follow this succession of steps:</p>
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<ol>
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<li>Try to reproduce the bug.</li>
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<li>Create a test that proves the presence of the bug.</li>
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<li>Fix the bug.</li>
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</ol>
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<p>In case you are submitting the bonus via GitLab, it is helpful to commit tests
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before commiting the fixes, so that it is apparent that the bug is manifested.
|
||
Example of <code>git log</code> (notice that the first line represents latest commit):</p>
|
||
<div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-background-color:hsl(230, 1%, 98%);--prism-color:hsl(230, 8%, 24%)"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar" style="background-color:hsl(230, 1%, 98%);color:hsl(230, 8%, 24%)"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:hsl(230, 8%, 24%)"><span class="token plain">feat: Implement fizz_buzzer</span><br></span><span class="token-line" style="color:hsl(230, 8%, 24%)"><span class="token plain">test: Add tests for fizz_buzzer</span><br></span><span class="token-line" style="color:hsl(230, 8%, 24%)"><span class="token plain">fix: Fix NULL-check in print_name</span><br></span><span class="token-line" style="color:hsl(230, 8%, 24%)"><span class="token plain">test: Add test for NULL in print_name</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
|
||
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="tasks">Tasks<a href="#tasks" class="hash-link" aria-label="Direct link to Tasks" title="Direct link to Tasks"></a></h2>
|
||
<p>As to your tasks, there are multiple things wrong in this project.</p>
|
||
<ol>
|
||
<li>
|
||
<p>There are 2 "bugs" that cannot be detected via tests, i.e. they are not bugs
|
||
that affect functionality of the game.</p>
|
||
</li>
|
||
<li>
|
||
<p>There is one evil bug in <code>get_word</code>. It is not required to be fixed ;) Assign
|
||
it the lowest priority.</p>
|
||
</li>
|
||
<li>
|
||
<p>There are some tests failing. Please try to figure it out, so you have green
|
||
tests for the rest :)</p>
|
||
</li>
|
||
<li>
|
||
<p>We have gotten a bug report for <code>word_guessed</code>, all we got is</p>
|
||
<blockquote>
|
||
<p>doesn't work when there are too many <code>a</code>s</p>
|
||
</blockquote>
|
||
<p>Please try to replicate the bug and create a tests, so we don't get any
|
||
regression later on.</p>
|
||
</li>
|
||
<li>
|
||
<p>One hidden bug :) Closely non-specified, we cannot reproduce it and we were
|
||
drunk while playing the game, so we don't remember a thing. :/</p>
|
||
</li>
|
||
<li>
|
||
<p>Try to cover as much code via the tests as possible. We are not going to look
|
||
at the metrics, but DRY is violated a lot, so as a last task try to remove as
|
||
much of the duplicit code as possible.</p>
|
||
<p>Tests should help you a lot in case there are some regressions.</p>
|
||
</li>
|
||
</ol>
|
||
<hr>
|
||
<p>In case you wonder why there are always 3 same words in the file with words, it
|
||
is because of the <code>get_word</code> bug. It is not a bug that can be easily fixed, so
|
||
it is a not requirement at all and you can still get all points for the bonus ;)</p>
|
||
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="dictionary">Dictionary<a href="#dictionary" class="hash-link" aria-label="Direct link to Dictionary" title="Direct link to Dictionary"></a></h2>
|
||
<ul>
|
||
<li><a href="https://en.wikipedia.org/wiki/Functional_testing" target="_blank" rel="noopener noreferrer">Functional tests</a></li>
|
||
<li><a href="https://en.wikipedia.org/wiki/Smoke_testing_%28software%29" target="_blank" rel="noopener noreferrer">Smoke test</a></li>
|
||
<li><a href="https://en.wikipedia.org/wiki/Don%27t_repeat_yourself" target="_blank" rel="noopener noreferrer">DRY</a></li>
|
||
</ul>
|
||
<h2 class="anchor anchorWithStickyNavbar_LWe7" id="submitting">Submitting<a href="#submitting" class="hash-link" aria-label="Direct link to Submitting" title="Direct link to Submitting"></a></h2>
|
||
<p>In case you have any questions, feel free to reach out to me.</p>
|
||
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