Add Eager def (similiar to rspec's let!)

[rinslow]

Solves

This PR Solves #113

Context

This PR allows you to specify a def with {lazy: false} to make it eagerly evaluate instead of lazily.
This is very similiar to how let and let! are different in the RSpec library.

My use case for this feature is a sequelize ORM creation of an object.
Not all its needs the id of the object or even the object at all, because they are testing other side effects of the call. (for example, validations, errors being thrown, HTTP calls being sent out).
Some however, do test the object.

[rinslow]

Suggested change

	function def(varName, definition, defOptions = {}) {
	function def(varName, definition, defOptions = {lazy: true}) {

[newhouse]

Not that my opinion matters much, but as a user who would like to see this feature, I'd imagined it being more of a whole new keyword/method rather than an option passed to the existing ’def’ method. It feels kinda verbose to have to do that for each one and if my tests already have a ’beforeEach’ I'd likely still just leave the options out and call them in there.

I dunno. Just my thoughts. Perhaps this is good but also alias it somehow? ’deff’? ’defE’?

[yard]

How about following given2 suite and add an exclamation mark:

def('myEagerVar!', () => Math.random())

On the PR, I think the evaluation should happen in beforeEach hook – you might be relying on some setup done there, plus it's needed to re-evaluate the variable between runs.

[rinslow]

Hey everyone! thanks for the comments :) loved your ideas
Can I please get a comment from the code owner? It's been more than a year and I don't know if this is the right direction in the owners eyes. @stalniy