diff --git a/src/ifcopenshell-python/test/api/unit/test_add_conversion_based_unit.py b/src/ifcopenshell-python/test/api/unit/test_add_conversion_based_unit.py
index 93a5002396..a29b9b2ad8 100644
--- a/src/ifcopenshell-python/test/api/unit/test_add_conversion_based_unit.py
+++ b/src/ifcopenshell-python/test/api/unit/test_add_conversion_based_unit.py
@@ -19,6 +19,7 @@
 import test.bootstrap
 import ifcopenshell.api.unit
 
+
 class TestAddConversionBasedUnitIFC2X3(test.bootstrap.IFC2X3):
     def test_run(self):
         unit = ifcopenshell.api.unit.add_conversion_based_unit(self.file, name="foot")
@@ -87,6 +88,7 @@ class TestAddConversionBasedUnitIFC2X3(test.bootstrap.IFC2X3):
             assert target_unit.Name == "SECOND"
             assert target_unit.Prefix is None
 
+
 class TestAddConversionBasedUnitIFC4(test.bootstrap.IFC4, TestAddConversionBasedUnitIFC2X3):
     def test_adding_a_unit_with_offset(self):
         unit = ifcopenshell.api.unit.add_conversion_based_unit(self.file, name="fahrenheit")
@@ -111,4 +113,4 @@ class TestAddConversionBasedUnitIFC4(test.bootstrap.IFC4, TestAddConversionBased
     def test_unknown_units_fall_back_to_userdefined(self):
         unknown_unit = ifcopenshell.api.unit.add_conversion_based_unit(self.file, name="unknown_unit")
         assert unknown_unit.UnitType == "USERDEFINED"
-        assert unknown_unit.Name == "unknown_unit"
\ No newline at end of file
+        assert unknown_unit.Name == "unknown_unit"