diff --git a/tests/test_tests_utils.py b/tests/test_tests_utils.py
index a9524465..65a1e759 100644
--- a/tests/test_tests_utils.py
+++ b/tests/test_tests_utils.py
@@ -159,7 +159,9 @@ def test_assert_tab_content_equal_investigation_except(self):
         with self.assertRaises(OSError) as context:
             with open(os.path.join(utils.TAB_DATA_DIR, 'BII-I-1', 'i_investigation.txt')) as i_tab1:
                 with open(os.path.join(utils.TAB_DATA_DIR, 'BII-S-3', 'i_gilbert.txt')) as i_tab2:
-                    self.assertEqual(utils.assert_tab_content_equal(i_tab1, i_tab2), "Cannot save file into a non-existent directory: '/Users/philippe/Downloads/test-isa-for-release'")
+                    self.assertEqual(utils.assert_tab_content_equal(i_tab1, i_tab2),
+                                     "Cannot save file into a non-existent directory: \
+                                     '/Users/philippe/Downloads/test-isa-for-release'")
 
     def test_assert_tab_content_equal_assay_table(self):
         with open(os.path.join(utils.TAB_DATA_DIR, 'BII-I-1', 's_BII-S-1.txt')) as s_tab1:
@@ -170,4 +172,4 @@ def test_assert_xml_equal(self):
         self.assertTrue(utils.assert_xml_equal(etree.fromstring(self.x1), etree.fromstring(self.x2)))
 
     def test_strip_id(self):
-        self.assertEqual(utils.strip_ids(self.j1), None)
\ No newline at end of file
+        self.assertEqual(utils.strip_ids(self.j1), None)