simplespec | small Scala library for writing specs

A difficult test of UI design patterns turns out to be a simple task:

• Create a generic component (in our case, a button)
• use it in a parent component
• get the child component to "actuate" effects in the parent component, or an adjacent sibling (if it can reach the parent, the parent should have no issue plumbing)

The design philosophy of Thermite is still a bit out of reach for me, but I think I understand how lenses and prisms can be used to combine Specs, but not how to invoke a parent's action.

This question was written for version 0.10.5, which may change by the reader's time.

The application being built will be a simple counter, where the increment button increases the count value, and the decrement button decreases it. We will do this by making a generic button component, then using multiple of them in the counter component. The design is as follows: