Refs #18012 Unit test to catch naming error

Framework/PythonInterface/test/python/plugins/algorithms/ExtractMonitorsTest.py

@@ -73,5 +73,21 @@ class ExtractMonitorsTest(unittest.TestCase):
 
         self.assertEquals(detectors.getNumberHistograms(), 200)
 
+    def test_workspace_with_same_input_ws_and_detector_ws_names(self):
+        CreateSampleWorkspace(OutputWorkspace='testWS', NumMonitors = 3)
+        ExtractMonitors(InputWorkspace = 'testWS', DetectorWorkspace = 'testWS', MonitorWorkspace = 'mon')
+        detectors = mtd['testWS']
+        monitors = mtd['mon']
+
+        self.assertEquals(detectors.getNumberHistograms(), 200)
+        self.assertEquals(monitors.getNumberHistograms(), 3)
+        self.assertEquals(detectors.getMonitorWorkspace().name(), "mon")
+
+        for i in range(monitors.getNumberHistograms()):
+            self.assertTrue(monitors.getDetector(i).isMonitor())
+
+        for i in range(detectors.getNumberHistograms()):
+            self.assertFalse(detectors.getDetector(i).isMonitor())
+
 if __name__=="__main__":
     unittest.main()