Consider having a cubic of the form
f(x) = a x^3 + b x^2 + c x + d
and you want to know if this cubic has a local minimum and if so, where that minimum is.
Then do the following in your code (make sure that a isn't equal to zero):
// Calculate the discriminant of the derivative of the cubic.
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| [==========] Running 1 test from 1 test suite. | |
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| [----------] 1 test from change_specsFixture | |
| [ RUN ] change_specsFixture.change_specs | |
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