Regarding this doc: https://github.com/testdouble/testdouble.js/blob/master/docs/3-getting-started.md#creating-a-test-double

We received these four chat messages as in-the-moment feedback:

this example is abit funky
…as the example, and MathProblem, doesn’t take constructor arg, but the test double example assumes it does
…ah i see, the later example implements the constructor
…kinda lost me until then

Look into these and see if we can pull forward what they need to make the doc read more naturally.