diff --git a/app/sample_registry/test/test_mapping.py b/app/sample_registry/test/test_mapping.py
index af3f05a..ecc1676 100644
--- a/app/sample_registry/test/test_mapping.py
+++ b/app/sample_registry/test/test_mapping.py
@@ -62,4 +62,4 @@ def test_look_up_nextera_barcodes():
     t = SampleTable.load(input_file)
     t.look_up_nextera_barcodes()
     assert t.recs[1]["BarcodeSequence"] == "ACTCGCTA-TATCCTCT"
-    assert t.validate() == None
+    assert t.validate() is None
diff --git a/app/sample_registry/test/test_register.py b/app/sample_registry/test/test_register.py
index a3399d0..32ec640 100644
--- a/app/sample_registry/test/test_register.py
+++ b/app/sample_registry/test/test_register.py
@@ -2,7 +2,6 @@
 import io
 import os
 import pytest
-import shutil
 import tempfile
 from sqlalchemy import and_, create_engine, select
 from sqlalchemy.orm import Session, sessionmaker
@@ -224,7 +223,6 @@ def test_register_annotations(db, temp_sample_file, temp_modified_sample_file):
 
 def test_unregister_samples(db, temp_sample_file):
     register_run(run_args, db)
-    out = io.StringIO()
     sample_file = temp_sample_file
     args = ["3", sample_file.name]
     register_sample_annotations(args, True, db)