1 files changed, 23 insertions, 0 deletions
diff --git a/tests/interval/test_hashing.py b/tests/interval/test_hashing.py
new file mode 100644
index 0000000..c18502f
--- /dev/null
+++ b/tests/interval/test_hashing.py
@@ -0,0 +1,23 @@
+from __future__ import annotations
+
+import pendulum
+
+
+def test_periods_with_same_duration_and_different_dates():
+    day1 = pendulum.DateTime(2018, 1, 1)
+    day2 = pendulum.DateTime(2018, 1, 2)
+    day3 = pendulum.DateTime(2018, 1, 2)
+
+    period1 = day2 - day1
+    period2 = day3 - day2
+
+    assert period1 != period2
+    assert len({period1, period2}) == 2
+
+
+def test_periods_with_same_dates():
+    period1 = pendulum.DateTime(2018, 1, 2) - pendulum.DateTime(2018, 1, 1)
+    period2 = pendulum.DateTime(2018, 1, 2) - pendulum.DateTime(2018, 1, 1)
+
+    assert period1 == period2
+    assert len({period1, period2}) == 1