Mocking for the field method of superagent

[maxkoryukov]

This is just a first step in implementation of mocking of the field function (see docs). This function is very useful when you are trying to send multipart form.

I just want to know, whether such improvements are interesting for you (as maintainers and owners)

Required for merge:

• owner approvement
• tests
• ????

[coveralls]

Coverage decreased (-4.9%) to 95.082% when pulling 77116df on maxkoryukov:feature/mock-field-method into 6ff0027 on A:master.

[coveralls]

Coverage decreased (-4.9%) to 95.082% when pulling 77116df on maxkoryukov:feature/mock-field-method into 6ff0027 on A:master.

[maxkoryukov]

@A, @tbranyen could you take a look at this PR to confirm, that it is useful. If yes - I will add tests and will check for a unmock (I am not sure, how new feature works with mock reset)

And a question about design: should field-method save params to the body or not?

[A]

I think it can be useful. But it's better to ask @tbranyen because he is the maintainer now. I believe him)

[tbranyen]

I'll look it over asap!

[tbranyen]

Looks good to me. Seems useful!

[maxkoryukov]

I will add tests;)

[maxkoryukov]

sorry... only on the next week
but we are using your package for testing, so I am forced to make this PR merge-able ;)