[util] Handle exact val cardinality edge case

Author: mpsonntag

odml/util.py

@@ -46,7 +46,7 @@ def format_cardinality(in_val):
         min_int = isinstance(v_min, int) and v_min >= 0
         max_int = isinstance(v_max, int) and v_max >= 0
 
-        if max_int and min_int and v_max > v_min:
+        if max_int and min_int and v_max >= v_min:
             return v_min, v_max
 
         if max_int and not v_min:

test/test_util.py

@@ -34,6 +34,10 @@ def test_format_cardinality(self):
         set_val = (2, 3)
         self.assertEqual(format_cardinality(set_val), set_val)
 
+        # Test exact value tuple set
+        set_val = (5, 5)
+        self.assertEqual(format_cardinality(set_val), set_val)
+
         # Test set failures
         with self.assertRaises(ValueError):
             format_cardinality("a")