diff --git a/tests/test_coremanager.py b/tests/test_coremanager.py
index 84d4ad5d..1bb92522 100644
--- a/tests/test_coremanager.py
+++ b/tests/test_coremanager.py
@@ -215,9 +215,11 @@ def test_export():
     ]:
         assert os.path.isfile(os.path.join(export_root, f))
 
+
 def test_override(caplog):
     import logging
     import os
+
     from fusesoc.config import Config
     from fusesoc.coremanager import CoreManager
     from fusesoc.librarymanager import Library
@@ -226,16 +228,17 @@ def test_override(caplog):
     core_base_dir = os.path.join(os.path.dirname(__file__), "capi2_cores", "override")
     cm = CoreManager(Config())
     with caplog.at_level(logging.WARNING):
-        cm.add_library(Library("1", os.path.join(core_base_dir,"1")), [])
+        cm.add_library(Library("1", os.path.join(core_base_dir, "1")), [])
     assert caplog.text == ""
 
     with caplog.at_level(logging.WARNING):
-        cm.add_library(Library("2", os.path.join(core_base_dir,"2")), [])
+        cm.add_library(Library("2", os.path.join(core_base_dir, "2")), [])
     assert "Replacing ::basic:0 in" in caplog.text
 
     core = cm.get_core(Vlnv("::basic"))
     assert core.core_root.endswith("2")
 
+
 def test_virtual():
     import os
     import tempfile