[gui][test_datawatcher] fix test since use a TomoBase and not a path to the acquisition

tomwer/gui/test/test_datawatcher.py

@@ -172,8 +172,8 @@ class _ObservationCounter(qt.QObject):
 
     def add(self, scanID):
         self.scansCounted = self.scansCounted + 1
-        if scanID not in self.scansID:
-            self.scansID.append(scanID)
+        if scanID.path not in self.scansID:
+            self.scansID.append(scanID.path)
 
     def getReceivedScan(self):
         return self.scansCounted
@@ -217,7 +217,6 @@ class TestTomoDir(TestCaseQt):
 
     def tearDown(self):
         self.tomodir.stop()
-        self.observationCounter.clear()
         self.tomodir = None
         if os.path.isdir(self.observeFolder):
             shutil.rmtree(self.observeFolder)
@@ -229,6 +228,8 @@ class TestTomoDir(TestCaseQt):
         existing we will found only those two observations once and that the
         tomodir object is still observing
         """
+        self.observationCounter.clear()
+
         self.tomodir.start()
         self.qapp.processEvents()
         time.sleep(self.WAIT_BTW_LOOP * 2.0)  # make sure no multiple signal are emitted