<p><a href="https://github.com/zoq" class="user-mention">@zoq</a> Its fine if you removed the single value Forward, Backward functions from tests as well. I intentionally created those to test <code>double fn(const double x);</code> and <code>double deriv(const double x);</code> separately, read somewhere it to be a good practice to test each private function separately to make later debugging in higher layers of abstraction easier. Its totally fine though. Thanks. <a href="https://github.com/rcurtin" class="user-mention">@rcurtin</a> sure, will do it.</p>

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