diff --git a/tests/integration/test_xtrigger_mgr.py b/tests/integration/test_xtrigger_mgr.py
index d0b9765979c..07abbdac24d 100644
--- a/tests/integration/test_xtrigger_mgr.py
+++ b/tests/integration/test_xtrigger_mgr.py
@@ -17,7 +17,7 @@
 """
 
 
-async def test_2_xtriggers(flow, start, scheduler):
+async def test_2_xtriggers(flow, start, scheduler, monkeypatch):
     """Test that if an itask has 2 wall_clock triggers with different
     offsets that xtrigger manager gets both of them.
 
@@ -26,6 +26,12 @@ async def test_2_xtriggers(flow, start, scheduler):
     n.b. Clock 3 exists to check the memoization path is followed,
     and causing this test to give greater coverage.
     """
+    task_point = 1588636800                # 2020-05-05
+    ten_years_ahead = 1904169600           # 2030-05-05
+    monkeypatch.setattr(
+        'cylc.flow.xtriggers.wall_clock.time',
+        lambda: ten_years_ahead - 1
+    )
     id_ = flow({
         'scheduler': {
             'allow implicit tasks': True
@@ -49,6 +55,13 @@ async def test_2_xtriggers(flow, start, scheduler):
         clock_2_ctx = schd.xtrigger_mgr.get_xtrig_ctx(foo_proxy, 'clock_2')
         clock_3_ctx = schd.xtrigger_mgr.get_xtrig_ctx(foo_proxy, 'clock_2')
 
-        assert clock_1_ctx.func_kwargs['trigger_time'] == 1588636800
-        assert clock_2_ctx.func_kwargs['trigger_time'] == 1904169600
-        assert clock_3_ctx.func_kwargs['trigger_time'] == 1904169600
+        assert clock_1_ctx.func_kwargs['trigger_time'] == task_point
+        assert clock_2_ctx.func_kwargs['trigger_time'] == ten_years_ahead
+        assert clock_3_ctx.func_kwargs['trigger_time'] == ten_years_ahead
+
+        schd.xtrigger_mgr.call_xtriggers_async(foo_proxy)
+        assert foo_proxy.state.xtriggers == {
+            'clock_1': True,
+            'clock_2': False,
+            'clock_3': False,
+        }