<a href="../testing-components/">Testing Components</a>,
because helpers are rendered to templates just like components.</em></p>
<p>Helpers are best tested with rendering tests, but can also be tested with unit
tests. Rendering tests will provide better coverage for helpers, as it more
closely simulates the lifecycle of a helper than in isolation.</p>
<p>We're going to demonstrate how to test helpers by testing the <code>format-currency</code>
helper from <a href="../../templates/writing-helpers/">Writing 