diff --git a/swh/loader/core/tests/test_converters.py b/swh/loader/core/tests/test_converters.py
--- a/swh/loader/core/tests/test_converters.py
+++ b/swh/loader/core/tests/test_converters.py
@@ -8,10 +8,8 @@
 import unittest
 from unittest.mock import Mock
 
-from nose.tools import istest
-
-from swh.model.from_disk import Content
 from swh.loader.core import converters
+from swh.model.from_disk import Content
 
 
 def tmpfile_with_content(fromdir, contentfile):
@@ -41,8 +39,7 @@
     def tearDown(self):
         self.tmpdir.cleanup()
 
-    @istest
-    def content_for_storage_path(self):
+    def test_content_for_storage_path(self):
         # given
         data = b'temp file for testing content storage conversion'
         tmpfile = tmpfile_with_content(self.tmpdir.name, data)
@@ -60,8 +57,7 @@
         # then
         self.assertEqual(content, expected_content)
 
-    @istest
-    def content_for_storage_data(self):
+    def test_content_for_storage_data(self):
         # given
         data = b'temp file for testing content storage conversion'
 
@@ -76,8 +72,7 @@
         # then
         self.assertEqual(content, expected_content)
 
-    @istest
-    def content_for_storage_too_long(self):
+    def test_content_for_storage_too_long(self):
         # given
         data = b'temp file for testing content storage conversion'
 
diff --git a/swh/loader/core/tests/test_queue.py b/swh/loader/core/tests/test_queue.py
--- a/swh/loader/core/tests/test_queue.py
+++ b/swh/loader/core/tests/test_queue.py
@@ -5,16 +5,13 @@
 
 import unittest
 
-from nose.tools import istest
-
-from swh.loader.core.queue import QueuePerNbElements
-from swh.loader.core.queue import QueuePerNbUniqueElements
-from swh.loader.core.queue import QueuePerSizeAndNbUniqueElements
+from swh.loader.core.queue import (QueuePerNbElements,
+                                   QueuePerNbUniqueElements,
+                                   QueuePerSizeAndNbUniqueElements)
 
 
 class TestQueuePerNbElements(unittest.TestCase):
-    @istest
-    def simple_queue_behavior(self):
+    def test_simple_queue_behavior(self):
         max_nb_elements = 10
         queue = QueuePerNbElements(max_nb_elements=max_nb_elements)
 
@@ -48,8 +45,7 @@
 
 
 class TestQueuePerNbUniqueElements(unittest.TestCase):
-    @istest
-    def queue_with_unique_key_behavior(self):
+    def test_queue_with_unique_key_behavior(self):
         max_nb_elements = 5
         queue = QueuePerNbUniqueElements(max_nb_elements=max_nb_elements,
                                          key='id')
@@ -86,8 +82,7 @@
 
 
 class TestQueuePerSizeAndNbUniqueElements(unittest.TestCase):
-    @istest
-    def queue_with_unique_key_and_size_behavior(self):
+    def test_queue_with_unique_key_and_size_behavior(self):
         max_nb_elements = 5
         max_size = 100
         queue = QueuePerSizeAndNbUniqueElements(