Removed cached conversion factor after setting it

Author: point85

PyCaliper/test/test_misc.py

@@ -36,4 +36,20 @@ def testNamedQuantity(self):
             self.assertTrue(q.uom is not None)
             self.assertTrue(str(q) is not None)
 
-        
+    def testCurrencyConversion(self):
+        msys = MeasurementSystem.instance()
+        
+        usd_uom = msys.createScalarUOM(UnitType.CURRENCY, None, "US-Dollar", "USD", "US paper dollar")
+        usdt_uom = msys.createScalarUOM(UnitType.CURRENCY, None, "Tether", "USDT", "USD stable coin")
+
+        # Initial conversion rate
+        usdt_uom.setConversion(0.9, usd_uom)
+
+        portfolio = Quantity(200, usdt_uom)
+        portfolio_usd = portfolio.convert(usd_uom)
+        self.assertAlmostEqual(portfolio_usd.amount, 180.0, None, None, TestingUtils.DELTA6)
+
+        # change conversion rate
+        usdt_uom.setConversion(1.0, usd_uom)
+        portfolio_usd = portfolio.convert(usd_uom)
+        self.assertAlmostEqual(portfolio_usd.amount, 200.0, None, None, TestingUtils.DELTA6)

PyCaliper/uom/unit_of_measure.py

@@ -454,6 +454,10 @@ def setConversion(self, scalingFactor, abscissaUnit, offset=0.0):
 
         # re-cache
         CacheManager.instance().registerUOM(self)
+        
+        # remove from conversion registry
+        if abscissaUnit in self.conversionRegistry:
+            self.conversionRegistry.pop(abscissaUnit)
 
     ##
     # Get the exponent of a power unit