@@ -0,0 +1,56 @@
+# Copyright (C) 2016-present the ayncpg authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of asyncpg and is released under
+# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
+
+from itertools import product
+
+from asyncpg.types import Range
+from asyncpg import _testbase as tb
+
+
+class TestTypes(tb.TestCase):
+
+def test_range_issubset(self):
+subs = [
+Range(empty=True),
+Range(lower=1, upper=5, lower_inc=True, upper_inc=False),
+Range(lower=1, upper=5, lower_inc=True, upper_inc=True),
+Range(lower=1, upper=5, lower_inc=False, upper_inc=True),
+Range(lower=1, upper=5, lower_inc=False, upper_inc=False),
+Range(lower=-5, upper=10),
+Range(lower=2, upper=3),
+Range(lower=1, upper=None),
+Range(lower=None, upper=None)
+]
+
+sups = [
+Range(empty=True),
+Range(lower=1, upper=5, lower_inc=True, upper_inc=False),
+Range(lower=1, upper=5, lower_inc=True, upper_inc=True),
+Range(lower=1, upper=5, lower_inc=False, upper_inc=True),
+Range(lower=1, upper=5, lower_inc=False, upper_inc=False),
+Range(lower=None, upper=None)
+]
+
+# Each row is 1 subs with all sups
+results = [
+True, True, True, True, True, True,
+False, True, True, False, False, True,
+False, False, True, False, False, True,
+False, False, True, True, False, True,
+False, True, True, True, True, True,
+False, False, False, False, False, True,
+False, True, True, True, True, True,
+False, False, False, False, False, True,
+False, False, False, False, False, True
+]
+
+for (sub, sup), res in zip(product(subs, sups), results):
+self.assertIs(
+sub.issubset(sup), res, "Sub:{}, Sup:{}".format(sub, sup)
+)
+self.assertIs(
+sup.issuperset(sub), res, "Sub:{}, Sup:{}".format(sub, sup)
+)