)
         file_content = ""
         for data in response.streaming_content:
-            file_content = '%s%s' % (file_content, data)
+            file_content = '%s%s' % (file_content, data.decode())
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        self.assertEqual("b'test1test2'", file_content)
+        self.assertEqual("test1test2", file_content)
         os.remove('nsd_content.txt')
 
     def test_nsd_content_download_when_ns_not_exist(self):
         )
         partial_file_content = ''
         for data in response.streaming_content:
-            partial_file_content = '%s%s' % (partial_file_content, data)
+            partial_file_content = '%s%s' % (partial_file_content, data.decode())
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        self.assertEqual("b'test2'", partial_file_content)
+        self.assertEqual("test2", partial_file_content)
         os.remove('nsd_content.txt')
 
     @mock.patch.object(NsDescriptor, 'create')
 
         resp = self.client.get("/api/nsd/v1/pnf_descriptors/22/pnfd_content")
         file_content = ""
         for data in resp.streaming_content:
-            file_content = '%s%s' % (file_content, data)
+            file_content = '%s%s' % (file_content, data.decode())
         self.assertEqual(resp.status_code, status.HTTP_200_OK)
-        self.assertEqual("b'test1test2'", file_content)
+        self.assertEqual("test1test2", file_content)
         os.remove('pnfd_content.txt')
 
     def test_pnfd_download_failed(self):
 
         response = self.client.get("/api/vnfpkgm/v1/vnf_packages/222/package_content", HTTP_RANGE="4-7")
         partial_file_content = ''
         for data in response.streaming_content:
-            partial_file_content = partial_file_content.encode() + data
+            partial_file_content = partial_file_content + data.decode()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        self.assertEqual(b'BBB', partial_file_content)
+        self.assertEqual('BBB', partial_file_content)
         os.remove("vnfPackage.csar")
 
     def test_fetch_last_partical_vnf_pkg(self):
         response = self.client.get("/api/vnfpkgm/v1/vnf_packages/222/package_content", HTTP_RANGE=" 4-")
         partial_file_content = ''
         for data in response.streaming_content:
-            partial_file_content = partial_file_content.encode() + data
+            partial_file_content = partial_file_content + data.decode()
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        self.assertEqual(b'BBBBCCCCDDDD', partial_file_content)
+        self.assertEqual('BBBBCCCCDDDD', partial_file_content)
         os.remove("vnfPackage.csar")
 
     def test_fetch_vnf_pkg_when_pkg_not_exist(self):