diff --git a/src/tests/helpers/test_models.py b/src/tests/helpers/test_models.py
new file mode 100644
index 0000000000..1995baadbb
--- /dev/null
+++ b/src/tests/helpers/test_models.py
@@ -0,0 +1,32 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020  Raphael Michel and contributors
+# Copyright (C) 2020-today pretix GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+from decimal import Decimal
+
+from pretix.helpers.models import _normalize_decimal
+
+
+def test_normalize_decimal():
+    assert str(_normalize_decimal(Decimal("20.0000"))) == "20"
+    assert str(_normalize_decimal(Decimal("20.0001"))) == "20.0001"
+    assert str(_normalize_decimal(Decimal("20.0100"))) == "20.01"
+    assert str(_normalize_decimal(Decimal("2000000.0000"))) == "2000000"
+    assert str(_normalize_decimal(Decimal("0.0001"))) == "0.0001"