Help wanted: add unit tests #5

This project is set up nearly identically to our other packages, https://github.com/coderedcorp/wagtail-seo and https://github.com/coderedcorp/wagtail-cache. So the basic unit tests can probably be copied from one of those projects as a starting point.

I have already created a "testproject" which implements all of the functionality.

However, there are no unit tests. The most basic unit test, which would probably get us up to 70% coverage instantly, would be to:

• Create a single unit test case.
• This test would create an instance of a page (i.e. MultiStepStreamFormPage in home/models.py)
• Make a GET request and ensure it responds with a 200

Slightly more advanced tests:

• Add one of each block type to the page instance
• Add at least 2 steps to the page instance.
• GET and POST both steps.
• Check that a FormSubmission object was created.