added test

[rnickles]

ok, so basically a recurring donation when first set up causes both a regular donation to be processed and a new record to be added to RecurringDonations table? so questions: (a) for the Cuke test that tests this, can you use @stubs_successful_credit_card_payment (see features/support/env.rb) rather than stubbing Stripe::Charge.create
directly; and (b) are there tests for the failure cases? handling failures on this is really important:
(a) what if the stripe charge fails? (the recurring donation should not be created, and the donation should not be recorded)
(b) what if creating the recurring donation fails? (the stripe charge should not occur for the initial donation)
not sure i saw scenarios/specs that covered the sad paths but they are pretty important... they can be a separate PR but i'm reluctant to incorporate code whose failure behavior is so critical unless the tests are pretty thorough....

Attempted to handle Armando's requests.

• We are already using @stubs_successful_credit_card_payment
• I think I solved (a)
• Not sure about (b)

Run the test with:
RUBYOPT="-W0" bundle exec cucumber features/donations/monthly_donation_user_view.feature

[winsonwan]

lgtm