diff --git a/tests/domain/abri/test_slots.py b/tests/domain/abri/test_slots.py
index 3b587064e..14f59ae9d 100644
--- a/tests/domain/abri/test_slots.py
+++ b/tests/domain/abri/test_slots.py
@@ -14,3 +14,14 @@ def test_a_booking_with_no_confirmed_time_is_an_all_day_appointment(
 
     # Assert
     assert slot == "AD"
+
+
+@pytest.mark.parametrize("confirmed_time", ["08:00", "09:30", "11:59"])
+def test_a_confirmed_time_before_midday_books_the_morning_slot(
+    confirmed_time: str,
+) -> None:
+    # Act
+    slot = slot_for_confirmed_time(confirmed_time)
+
+    # Assert
+    assert slot == "AM"