diff --git a/test/towerops/on_call_test.exs b/test/towerops/on_call_test.exs
index b315fcdf..303a9af3 100644
--- a/test/towerops/on_call_test.exs
+++ b/test/towerops/on_call_test.exs
@@ -7,6 +7,7 @@ defmodule Towerops.OnCallTest do
   import Towerops.OrganizationsFixtures
 
   alias Towerops.OnCall
+  alias Towerops.OnCall.Schedule
 
   setup do
     user = user_fixture()
@@ -560,4 +561,23 @@ defmodule Towerops.OnCallTest do
       assert OnCall.who_is_on_call(Ecto.UUID.generate(), ~U[2026-03-01 12:00:00Z]) == nil
     end
   end
+
+  describe "change_* helpers" do
+    test "change_schedule/1 returns a changeset for an empty struct", %{} do
+      changeset = OnCall.change_schedule(%Schedule{})
+      assert %Ecto.Changeset{} = changeset
+      assert changeset.data.__struct__ == Schedule
+    end
+
+    test "change_schedule/2 applies provided attrs", %{organization: org} do
+      schedule = schedule_fixture(org.id)
+      changeset = OnCall.change_schedule(schedule, %{name: "Renamed"})
+      assert Ecto.Changeset.get_change(changeset, :name) == "Renamed"
+    end
+
+    test "change_escalation_policy/1 returns a changeset" do
+      assert %Ecto.Changeset{} =
+               OnCall.change_escalation_policy(%Towerops.OnCall.EscalationPolicy{})
+    end
+  end
 end