diff --git a/tests/test_event_handling.py b/tests/test_event_handling.py
index e7bf59b..f69cbed 100644
--- a/tests/test_event_handling.py
+++ b/tests/test_event_handling.py
@@ -46,7 +46,7 @@ class MockEventData:
         # list of data packates containing previous events
         packets = np.recarray((1000,), dtype=PACKET_TYPE)
         packets.start_index = np.linspace(0, events.shape[0]-1, packets.shape[0], dtype=np.uint32)
-        packets.time = np.linspace(1700000000000000000, 1700000000000000000+3_600_000_000,
+        packets.time = np.linspace(1700000000000000000, 1700000000000000000+3_600_000_000_000,
                                    packets.shape[0], dtype=np.int64)
 
         # chopper pulses within the measurement time
@@ -58,7 +58,7 @@ class MockEventData:
         proton_current = np.recarray((50,), dtype=PC_TYPE)
         proton_current.current = 1500.0
         proton_current[np.random.randint(0, proton_current.shape[0]-1, 10)] = 0. # random time with no current
-        proton_current.time = np.linspace(1700000000000000300, 1700000000000000000+3_600_000_000,
+        proton_current.time = np.linspace(1700000000000000300, 1700000000000000000+3_600_000_000_000,
                                    proton_current.shape[0], dtype=np.int64)
 
         self.data = AmorEventStream(events, packets, pulses, proton_current)
@@ -420,20 +420,30 @@ class TestSimpleActions(TestCase):
                                                                         dtype=np.int32))
 
     def test_merge_frames(self):
-        action = MergeFrames(lamdaCut=0.0)
+        action = MergeFrames(lamdaCut=0.0, preciseTime=False)
         action.perform_action(self.d)
         self.assertEqual(self.d.data.events.tof.shape, self.d.orig_data.events.tof.shape)
         np.testing.assert_array_compare(lambda x,y: x<=y, self.d.data.events.tof, self.d.orig_data.events.tof)
         self.assertTrue((-self.d.timing.tau<=self.d.data.events.tof).all())
         np.testing.assert_array_less(self.d.data.events.tof, self.d.timing.tau)
 
-        action = MergeFrames(lamdaCut=2.0)
+        action = MergeFrames(lamdaCut=2.0, preciseTime=False)
         self.d.data.events.tof = self.d.orig_data.events.tof[:]
         action.perform_action(self.d)
         tofCut = 2.0*self.d.geometry.chopperDetectorDistance/const.hdm*1e-13
         self.assertTrue((tofCut-self.d.timing.tau<=self.d.data.events.tof).all())
         self.assertTrue((self.d.data.events.tof<=tofCut+self.d.timing.tau).all())
 
+    def test_merge_frames_splitting(self):
+        action = MergeFrames(lamdaCut=0.0, preciseTime=True)
+        self._extract_walltime()
+        action.perform_action(self.d)
+        self.assertEqual(self.d.data.events.tof.shape, self.d.orig_data.events.tof.shape)
+        np.testing.assert_array_compare(lambda x,y: x<=y, self.d.data.events.tof, self.d.orig_data.events.tof)
+        self.assertEqual(self.d.data.pulses.shape[0], self.d.orig_data.pulses.shape[0]*2+1)
+        np.testing.assert_array_less(self.d.orig_data.pulses.time[:-1], self.d.orig_data.pulses.time[1:])
+        np.testing.assert_array_less(self.d.data.pulses.time[:-1], self.d.data.pulses.time[1:])
+
     def test_analyze_pixel_ids(self):
         action = AnalyzePixelIDs((1000, 1001))
         action.perform_action(self.d)