Update apispec package to 0.39.0

Addresses #3356

- New `prance` package is used for `validate_spec`
- Additional imports needed for swagger tests

requirements.txt

@@ -1,4 +1,4 @@
-apispec==0.19.0
+apispec==0.39.0
 cfenv==0.5.2
 invoke==0.15.0
 psycopg2==2.7.1
@@ -25,6 +25,7 @@ git+https://github.com/18F/slate.git
 
 # Marshalling
 flask-apispec==0.6.0.post0
+prance==0.13.1
 marshmallow==2.6.0
 marshmallow-sqlalchemy==0.8.0
 git+https://github.com/jmcarp/marshmallow-pagination@master

tests/test_swagger.py

@@ -1,8 +1,11 @@
 import unittest
-
 from apispec import utils, exceptions
+
+import webservices.rest
+import webservices.schemas  # needed to generate full spec
 from webservices.spec import spec, format_docstring
 
+
 class TestSwagger(unittest.TestCase):
 
     def test_swagger_valid(self):