Add early exit to Property.to_unit if units are equal

src/property_utils/properties/property.py

@@ -159,6 +159,9 @@ def to_unit(self, unit: UnitDescriptor) -> Self:
             >>> T.to_unit(RelativeTemperatureUnit.FAHRENHEIT)
             <Property: 212.0 °F>
         """
+        if self.unit == unit:
+            return self.__class__(unit=self.unit, value=self.value)
+
         if not unit.isinstance_equivalent(self.unit.to_generic()):
             raise PropertyUnitConversionError(
                 f"cannot convert {self} to ({unit}) units; 'unit' should be an instance"

src/property_utils/tests/properties/test_property.py

@@ -167,15 +167,15 @@ def subject(self, unit):
 
     @args({"unit": Unit1.a})
     def test_with_simple_si_units(self):
-        self.assert_result("200.0 a")
+        self.assert_result("200 a")
 
     @args({"unit": Unit1.a**2})
     def test_with_dimension_si_units(self):
-        self.assert_result("200.0 (a^2)")
+        self.assert_result("200 (a^2)")
 
     @args({"unit": (Unit1.a**2) / (Unit4.d**3)})
     def test_with_composite_si_units(self):
-        self.assert_result("200.0 (a^2) / (d^3)")
+        self.assert_result("200 (a^2) / (d^3)")
 
     @args({"unit": Unit1.A})
     def test_with_simple_non_si_units(self):
@@ -210,7 +210,7 @@ def test_with_different_unit_type(self):
 
     @args({"unit": Unit1.A})
     def test_with_same_unit(self):
-        self.assert_result("105.0 A")
+        self.assert_result("105 A")
 
     @args({"unit": Unit1.a})
     def test_with_other_unit(self):
@@ -233,7 +233,7 @@ def test_with_different_dimension(self):
 
     @args({"unit": Unit1.A**2})
     def test_with_same_dimension(self):
-        self.assert_result("52.0 (A^2)")
+        self.assert_result("52 (A^2)")
 
     @args({"unit": Unit1.a**2})
     def test_with_other_unit(self):
@@ -256,7 +256,7 @@ def test_with_different_composite_dimension(self):
 
     @args({"unit": (Unit1.A**2) / (Unit4.D**3)})
     def test_with_same_composite_dimension(self):
-        self.assert_result("20.0 (A^2) / (D^3)")
+        self.assert_result("20 (A^2) / (D^3)")
 
     @args({"unit": (Unit1.a**2) / (Unit4.d**3)})
     def test_with_other_unit(self):