add test for multiform with 2 forms of the same type

Author: TimBest

features/profile_form_view.feature

@@ -0,0 +1,8 @@
+Feature: ProfileFormView
+  A demo view for illustrating how to use a MultiModelFormView where two of the forms are of the
+  same form type
+
+  Scenario: A user creates a profile
+    Given that a user fills in the profile form with valid input
+    When the user submits the profile form
+    Then a Profile and 2 unique Photo instance are created

features/steps/profile_form_view.py

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+#pylint: disable=function-redefined, no-name-in-module, import-error
+from behave import given
+from behave import then
+from behave import when
+
+from base.models import Photo, Profile
+
+
+@given('that a user fills in the profile form with valid input')
+def step_impl(context):
+    context.browser.visit(context.get_url('profiles_new'))
+    context.browser.fill('name', 'lando calrissian')
+    context.browser.attach_file('avatar-image', 'test.png')
+    context.browser.choose('avatar-tag', Photo.UNKNOWN)
+    context.browser.attach_file('background-image', 'test1.ico')
+    context.browser.choose('background-tag', Photo.PLANT)
+
+@when('the user submits the profile form')
+def step_impl(context):
+    context.browser.find_by_css('input[type=submit]').first.click()
+
+@then('a Profile and 2 unique Photo instance are created')
+def step_impl(context):
+    assert Photo.objects.count() == 2
+    assert Profile.objects.count() == 1
+
+    # TODO: compare hash of image contents instead of name
+    photo1 = Photo.objects.order_by('created_at').first().image.name
+    assert photo1 == './test.png' or photo1 == './test1.ico'
+    photo2 = Photo.objects.order_by('created_at').last().image.name
+    assert photo2 == './test.png' or photo2 == './test1.ico'
+    assert photo1 != photo2