Adding integration and end2end test

[SteinerPascal]

I think it is time now to do this step =)

I have tested a couple of testing frameworks and I think cypress would be a good choice. I've already got it working and if you are interested as well then I would open a new branch.

Why I think this is necessary:

• Sparnatural has extensive configurations options. Test cases make sure they all work
• Introducing new features without breaking old functionalities.
• Improved documentary with lots of code examples in the test cases

But of course that means also some more configuration for bundling and testing

What do you think?

[tfrancart]

I am 100% for introducing tests, but I am 100% not ready to pay for the cloud solution of cypress. Are you sure it works without the cloud version ? Please go ahead and introduce a new branch for it !

[SteinerPascal]

No cloud necessary. That is just for advanced use cases, scaling and bigger product development. The framework itself is open source.