Still needs some work though.

So that it even better matches testing a real response object.

Because who would want to define the literal full html, in order
for the assertion to not fail.

Currently missing UnitTests

Some testing/value seemed unhappy with the value I was using.
Now it probably include more than I need, but hopefully it will
lead to less annoying troubleshooting in the future.

Plus it only affects the project tests so it should be fine.