Add preliminary tests

tests/test_offline.py

@@ -490,6 +490,12 @@ class TestOfflineTracks(unittest.TestCase):
             self.f.events[3:5][1].tracks.fitinf[9][2],
         )
 
+class TestMisc(unittest.TestCase):
+    def test_mc_tracks_counter(self):
+        r = OfflineReader(data_path("gseagen/DAT000001.gSeaGen.1.aa.root"))
+        np.testing.assert_allclose([1,2,3], r.mc_tracks.counter[0])
+        
+
 
 class TestBranchIndexingMagic(unittest.TestCase):
     def setUp(self):