 example, suppose you have written a function that returns the square of a number. You write some tests for it:</p>

<div class="language-c++ highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kt">int</span> <span class="nf">square</span><span class="p">(</span><span class="kt">int</span> <span class="n">n</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">return</span> <span class="n">n</span> <span class="o">*</span> <span class="n">n</span><span c