diff --git a/src/drf_yasg/management/commands/generate_swagger.py b/src/drf_yasg/management/commands/generate_swagger.py
index 5cc290f1..53263781 100644
--- a/src/drf_yasg/management/commands/generate_swagger.py
+++ b/src/drf_yasg/management/commands/generate_swagger.py
@@ -126,6 +126,8 @@ def handle(self, output_file, overwrite, format, api_url, mock, user, private, *
         if output_file == '-':
             self.write_schema(schema, self.stdout, format)
         else:
+            # normally this would be easily done with open(mode='x'/'w'),
+            # but python 2 is a pain in the ass as usual
             flags = os.O_CREAT | os.O_WRONLY
             flags = flags | (os.O_TRUNC if overwrite else os.O_EXCL)
             with os.fdopen(os.open(output_file, flags), "w") as stream:
diff --git a/src/drf_yasg/views.py b/src/drf_yasg/views.py
index 7833226e..b7ddffa3 100644
--- a/src/drf_yasg/views.py
+++ b/src/drf_yasg/views.py
@@ -11,6 +11,7 @@
 from rest_framework.views import APIView
 
 from drf_yasg.app_settings import swagger_settings
+
 from .generators import OpenAPISchemaGenerator
 from .renderers import OpenAPIRenderer, ReDocRenderer, SwaggerJSONRenderer, SwaggerUIRenderer, SwaggerYAMLRenderer
 
diff --git a/tests/conftest.py b/tests/conftest.py
index 6569fa7b..e41845cc 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -9,8 +9,8 @@
 from rest_framework.test import APIRequestFactory
 from rest_framework.views import APIView
 
-from drf_yasg import openapi, codecs
-from drf_yasg.codecs import yaml_sane_load, yaml_sane_dump
+from drf_yasg import codecs, openapi
+from drf_yasg.codecs import yaml_sane_dump, yaml_sane_load
 from drf_yasg.generators import OpenAPISchemaGenerator
 
 
@@ -47,8 +47,8 @@ def swagger(mock_schema_request):
 
 
 @pytest.fixture
-def swagger_dict(swagger):
-    json_bytes = codec_json().encode(swagger)
+def swagger_dict(swagger, codec_json):
+    json_bytes = codec_json.encode(swagger)
     return json.loads(json_bytes.decode('utf-8'), object_pairs_hook=OrderedDict)
 
 
diff --git a/tests/test_reference_schema.py b/tests/test_reference_schema.py
index d423f4ac..638821b9 100644
--- a/tests/test_reference_schema.py
+++ b/tests/test_reference_schema.py
@@ -1,4 +1,9 @@
-from drf_yasg.inspectors import FieldInspector, SerializerInspector, PaginatorInspector, FilterInspector
+import json
+from collections import OrderedDict
+
+from drf_yasg import openapi
+from drf_yasg.generators import OpenAPISchemaGenerator
+from drf_yasg.inspectors import FieldInspector, FilterInspector, PaginatorInspector, SerializerInspector
 
 
 def test_reference_schema(swagger_dict, reference_schema, compare_schemas):
@@ -21,13 +26,23 @@ class NoOpPaginatorInspector(PaginatorInspector):
     pass
 
 
-def test_noop_inspectors(swagger_settings, swagger_dict, reference_schema, compare_schemas):
+def test_noop_inspectors(swagger_settings, mock_schema_request, codec_json, reference_schema, compare_schemas):
     from drf_yasg import app_settings
 
     def set_inspectors(inspectors, setting_name):
+        inspectors = [__name__ + '.' + inspector.__name__ for inspector in inspectors]
         swagger_settings[setting_name] = inspectors + app_settings.SWAGGER_DEFAULTS[setting_name]
 
     set_inspectors([NoOpFieldInspector, NoOpSerializerInspector], 'DEFAULT_FIELD_INSPECTORS')
     set_inspectors([NoOpFilterInspector], 'DEFAULT_FILTER_INSPECTORS')
     set_inspectors([NoOpPaginatorInspector], 'DEFAULT_PAGINATOR_INSPECTORS')
+
+    generator = OpenAPISchemaGenerator(
+        info=openapi.Info(title="Test generator", default_version="v1"),
+        version="v2",
+    )
+    swagger = generator.get_schema(mock_schema_request, True)
+
+    json_bytes = codec_json.encode(swagger)
+    swagger_dict = json.loads(json_bytes.decode('utf-8'), object_pairs_hook=OrderedDict)
     compare_schemas(swagger_dict, reference_schema)