diff --git a/byro_shackspace/tests/test_bank_import.py b/byro_shackspace/tests/test_bank_import.py
index c5b6d7d..10830b8 100644
--- a/byro_shackspace/tests/test_bank_import.py
+++ b/byro_shackspace/tests/test_bank_import.py
@@ -25,6 +25,17 @@ def bank_transaction_csv_file():
 @pytest.mark.django_db
 def test_bank_import(bank_transaction_csv_file):
     assert bank_transaction_csv_file.transactions.count() == 0
-    process_bank_csv(bank_transaction_csv_file)
+    process_bank_csv(bank_transaction_csv_file, None)
+    bank_transaction_csv_file.refresh_from_db()
+    assert bank_transaction_csv_file.transactions.count() == 6
+
+
+@pytest.mark.django_db
+def test_bank_import_no_duplicates(bank_transaction_csv_file):
+    assert bank_transaction_csv_file.transactions.count() == 0
+    process_bank_csv(bank_transaction_csv_file, None)
+    bank_transaction_csv_file.refresh_from_db()
+    assert bank_transaction_csv_file.transactions.count() == 6
+    process_bank_csv(bank_transaction_csv_file, None)
     bank_transaction_csv_file.refresh_from_db()
     assert bank_transaction_csv_file.transactions.count() == 6