diff --git a/tests/view/plotting/plotting_widget/test_plotting_widget_helper.py b/tests/view/plotting/plotting_widget/test_plotting_widget_helper.py
index 72467c3dbb5a60eb7cbe5c3a894d425fc99aa9b1..57a17b968781d3f9e17ac917665b678a2b0694b6 100644
--- a/tests/view/plotting/plotting_widget/test_plotting_widget_helper.py
+++ b/tests/view/plotting/plotting_widget/test_plotting_widget_helper.py
@@ -5,13 +5,13 @@ from sohstationviewer.view.plotting.plotting_widget.plotting_widget_helper \
     import get_total_miny_maxy, get_index_from_data_picked
 
 
-class TestGetIndexFromTime(TestCase):
+class TestGetIndexFromDataPicked(TestCase):
     @classmethod
     def setUpClass(cls) -> None:
         cls.plotting_data = {
             'CH1': {
-                'times': [np.array([1, 2, 3, 4, 5, 6])],
-                'data': [np.array([1, 1, 0, 1, 1, 0])],
+                'times': [np.array([1, 2, 3, 4, 5, 6, 6])],
+                'data': [np.array([1, 1, 0, 1, 1, 0, 0])],
                 'chan_db_info': {'plotType': 'upDownDots'}
             },
             'CH2': {
@@ -27,45 +27,51 @@ class TestGetIndexFromTime(TestCase):
         }
 
     def test_time_not_included(self):
-        real_idx = get_index_from_data_picked(
+        real_idxes = get_index_from_data_picked(
             self.plotting_data['CH1'], 7, 1)
-        self.assertIsNone(real_idx)
+        self.assertEqual(len(real_idxes), 0)
 
-    def test_type_not_need_data_info(self):
-        # CH3 has plotType='dotForTime' in ["multiColorDots", "dotForTime"])
-        real_idx = get_index_from_data_picked(
+    def test_type_not_need_data_val(self):
+        # CH3 has plotType='dotForTime'
+        # which is in ["multiColorDots", "dotForTime"])
+        real_idxes = get_index_from_data_picked(
             self.plotting_data['CH3'], 4, 4)
-        self.assertEqual(real_idx, 3)
+        self.assertEqual(real_idxes.tolist(), [3])
 
-    def test_type_need_data_info(self):
+    def test_type_need_data_val(self):
         # CH2 has plotType='linesDots' not in ["multiColorDots", "dotForTime"])
         with self.subTest('data not match time'):
-            real_idx = get_index_from_data_picked(
+            real_idxes = get_index_from_data_picked(
                 self.plotting_data['CH2'], 3, 5)
-            self.assertIsNone(real_idx)
+            self.assertEqual(len(real_idxes), 0)
         with self.subTest('data match 1st value'):
-            real_idx = get_index_from_data_picked(
+            real_idxes = get_index_from_data_picked(
                 self.plotting_data['CH2'], 3, 7)
-            self.assertEqual(real_idx, 2)
+            self.assertEqual(real_idxes.tolist(), [2])
         with self.subTest('data match 2nd value'):
-            real_idx = get_index_from_data_picked(
+            real_idxes = get_index_from_data_picked(
                 self.plotting_data['CH2'], 3, 4)
-            self.assertEqual(real_idx, 3)
+            self.assertEqual(real_idxes.tolist(), [3])
 
     def test_type_up_down(self):
         # CH1 has plotType='upDownDots'
         with self.subTest('data not match time'):
-            real_idx = get_index_from_data_picked(
+            real_idxes = get_index_from_data_picked(
                 self.plotting_data['CH1'], 1, -0.5)
-            self.assertIsNone(real_idx)
+            self.assertEqual(len(real_idxes), 0)
         with self.subTest('data=1 match time'):
-            real_idx = get_index_from_data_picked(
+            real_idxes = get_index_from_data_picked(
                 self.plotting_data['CH1'], 1, 0.5)
-            self.assertEqual(real_idx, 0)
+            self.assertEqual(real_idxes.tolist(), [0])
         with self.subTest('data=0 match time'):
-            real_idx = get_index_from_data_picked(
+            real_idxes = get_index_from_data_picked(
                 self.plotting_data['CH1'], 3, -0.5)
-            self.assertEqual(real_idx, 2)
+            self.assertEqual(real_idxes.tolist(), [2])
+
+    def test_2_overlapped_points(self):
+        real_idxes = get_index_from_data_picked(
+            self.plotting_data['CH1'], 6, -0.5)
+        self.assertEqual(real_idxes.tolist(), [5, 6])
 
 
 class TestGetTotalMinyMaxy(TestCase):