Write high level tests for a few complex templates?

[SebastianStehle]

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[SebastianStehle]

@LiamRiddell I have pushed a test with Amario template and the test is green :)

I had to make a few bugfixes, but now it works. The only problem are the comments, but thats okay, I guess.

But I realized that we should not use https://mjml.io/ to create our expected html results, because it is not up to date and if you use the current version as a reference your tests can be wrong.

[LiamRiddell]

That's good to know! I'm going to add all of the MJML templates to the benchmarking project. As it was good for finding bugs. Furthermore, I may add then to the test runner so we can get all of the output for comparison.

[SebastianStehle]

The unit tests writes all htmls to a file already.