Add form honeypot

[kimakan]

For the test I would expect some kind of a failing case. For example, a case where the honeypot field is not empty. Does it make sense to include such a test?

[agy-why]

I agree with @kimakan. It would be nice not only to test that we do not break our forms but also that we correctly use the middleware and verify that providing a filled phone field returns a 404.

[triole]

Yes, I agree. We should add honeypot tests which respond with a 400 if the field is not filled correctly or missing. I added these two.

[coveralls]

Pull Request Test Coverage Report for Build 4043234877

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.005%) to 64.206%

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Totals
Change from base Build 3995188500:	0.005%
Covered Lines:	4653
Relevant Lines:	7247

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💛 - Coveralls