fix(input.go): delete answer after validate failure

[zitn]

Closes #350

[AlecAivazis]

@zigitn - i fixed the issue preventing the CI pipeline from executing. Mind rebasing onto master so we can get this in?

[zitn]

Of course, do I need to submit a new pr?

[AlecAivazis]

You should be able to get away with just force-pushing over your existing branch

[AlecAivazis]

Thanks for doing that @zigitn! Do you mind adding a test that verifies this behavior?

[cben]

@AlecAivazis I didn't find existing tests for WithValidator that actually test the input.go logic. Do you have advice how/where to test this?

[AlecAivazis]

@cben - thanks for picking this up. I think the Ask tests are a good example to copy

[cben]

Turns out the whole TestAsk test has been disabled in https://github.com/AlecAivazis/survey/pull/216/files#diff-3a029c8ea50304c9dc5637560df2375bc28f1620d72744a13f4d3c152bb16a4aR120 and doesn't run.
I'm working on separate PR to re-enable them (or most of them) => #354.
Meanwhile I noticed that this PR breaks one of the existing tests; didn't check yet if a real bug, but I suggest holding on merging this until we have the tests back.

[AlecAivazis]

Going to close this as its gone a bit stale