Quantity comparisons ensure other is Quantity.

1 files changed, 8 insertions, 1 deletions

diff --git a/pint/testsuite/test_quantity.py b/pint/testsuite/test_quantity.py
index b5780e5..fe86801 100644
--- a/pint/testsuite/test_quantity.py
+++ b/pint/testsuite/test_quantity.py
@@ -6,7 +6,7 @@ import pickle
 import warnings
 from unittest.mock import patch
 
-from pint import DimensionalityError, OffsetUnitCalculusError, UnitRegistry
+from pint import DimensionalityError, OffsetUnitCalculusError, UnitRegistry, Quantity, get_application_registry
 from pint.compat import np
 from pint.testsuite import QuantityTestCase, helpers
 from pint.testsuite.parameterized import ParameterizedTestCase
@@ -63,6 +63,8 @@ class TestQuantity(QuantityTestCase):
         y = self.Q_(4.2, "meter")
         z = self.Q_(5, "meter")
         j = self.Q_(5, "meter*meter")
+        k = 5 * get_application_registry().meter # Include a comparison to the application registry
+        l = Quantity(5, "meter") # Include a comparison to a directly created Quantity
 
         # identity for single object
         self.assertTrue(x == x)
@@ -81,6 +83,11 @@ class TestQuantity(QuantityTestCase):
         self.assertTrue(x != z)
         self.assertTrue(x < z)
 
+        # Compare with items to the separate application registry
+        self.assertTrue(k >= l) # These should both be from application registry
+        with self.assertRaises(ValueError):
+            z>l # One from local registry, one from application registry
+
         self.assertTrue(z != j)
 
         self.assertNotEqual(z, j)