diff --git a/tests/test_data_account.py b/tests/test_data_account.py
index 9546d321f2188f2f0ff95cc626e6b7dae6872acb..106d11453ee1a9a66ca1e4c9b62d7b8cf8c8e720 100644
--- a/tests/test_data_account.py
+++ b/tests/test_data_account.py
@@ -444,6 +444,8 @@ def test_iter_accounts_by_classification(asset_hierarchy, arg, expect_subaccts):
     }
 
 @pytest.mark.parametrize('arg,expect_subaccts', [
+    (None, ['Bank:CD', 'Bank:Checking', 'Bank:Savings', 'Cash',
+            'Investment:Commodities', 'Investment:Stocks']),
     ('Assets', ['Bank:CD', 'Bank:Checking', 'Bank:Savings', 'Cash',
                 'Investment:Commodities', 'Investment:Stocks']),
     ('Assets:Bank', ['CD', 'Checking', 'Savings']),
@@ -454,7 +456,7 @@ def test_iter_accounts_by_classification(asset_hierarchy, arg, expect_subaccts):
     ('Unused classification', []),
 ])
 def test_iter_accounts(asset_hierarchy, arg, expect_subaccts):
-    if arg.startswith('Assets'):
+    if arg and arg.startswith('Assets'):
         prefix = arg
     else:
         prefix = 'Assets'