Fix broken SwaggerDict pickling (#15)

Closes #14.

tests/conftest.py

@@ -45,8 +45,8 @@ def validate_schema():
         from flex.core import parse as validate_flex
         from swagger_spec_validator.validator20 import validate_spec as validate_ssv
 
-        validate_flex(swagger)
-        validate_ssv(swagger)
+        validate_flex(copy.deepcopy(swagger))
+        validate_ssv(copy.deepcopy(swagger))
 
     return validate_schema
 

tests/test_schema_views.py

@@ -1,4 +1,5 @@
 import json
+from collections import OrderedDict
 
 import pytest
 from ruamel import yaml
@@ -46,6 +47,26 @@ def test_redoc(client, validate_schema):
     _validate_text_schema_view(client, validate_schema, '/redoc/?format=openapi', json.loads)
 
 
+def test_caching(client, validate_schema):
+    prev_schema = None
+
+    for i in range(3):
+        _validate_ui_schema_view(client, '/cached/redoc/', 'redoc/redoc.min.js')
+        _validate_text_schema_view(client, validate_schema, '/cached/redoc/?format=openapi', json.loads)
+        _validate_ui_schema_view(client, '/cached/swagger/', 'swagger-ui-dist/swagger-ui-bundle.js')
+        _validate_text_schema_view(client, validate_schema, '/cached/swagger/?format=openapi', json.loads)
+
+        json_schema = client.get('/cached/swagger.json')
+        assert json_schema.status_code == 200
+        json_schema = json.loads(json_schema.content.decode('utf-8'), object_pairs_hook=OrderedDict)
+        if prev_schema is None:
+            validate_schema(json_schema)
+            prev_schema = json_schema
+        else:
+            from datadiff.tools import assert_equal
+            assert_equal(prev_schema, json_schema)
+
+
 @pytest.mark.urls('urlconfs.non_public_urls')
 def test_non_public(client):
     response = client.get('/private/swagger.yaml')