ts pass but the third will fail. The square of 15 is actually 225, not 275. The problem isn't with the <code class="language-c++ highlighter-rouge"><span class="n">square</span><span class="p">()</span></code> function, but with the buggy test case that produces a false negative.  Every programmer can relate to a time when a buggy test case reported an erroneous failure that led to wild goose chase to find a non-existent flaw in code that was correct all along, argh!</p>

<p>There can also be tests that pro