diff --git a/backend/api/tests/api/test_example_state.py b/backend/api/tests/api/test_example_state.py
index 9d799e1c..f6bdacd8 100644
--- a/backend/api/tests/api/test_example_state.py
+++ b/backend/api/tests/api/test_example_state.py
@@ -1,8 +1,9 @@
+from django.conf import settings
 from rest_framework import status
 from rest_framework.reverse import reverse
 
 from .utils import (CRUDMixin, make_doc, make_example_state, make_user,
-                    prepare_project)
+                    prepare_project, assign_user_to_role)
 
 
 class TestExampleStateList(CRUDMixin):
@@ -54,14 +55,45 @@ class TestExampleStateConfirmCollaborative(CRUDMixin):
         self.example = make_doc(self.project.item)
         self.url = reverse(viewname='example_state_list', args=[self.project.item.id, self.example.id])
 
-    def test_can_share_example_state(self):
-        member1 = self.project.users[0]
-        member2 = self.project.users[1]
-        response = self.assert_fetch(member1, status.HTTP_200_OK)
+    def test_cannot_share_example_state_in_other_role(self):
+        admin = self.project.users[0]
+        approver = self.project.users[1]
+        response = self.assert_fetch(admin, status.HTTP_200_OK)
         self.assertEqual(response.data['count'], 0)
-        self.assert_create(member1, status.HTTP_201_CREATED)  # confirm
-        response = self.assert_fetch(member1, status.HTTP_200_OK)
+        response = self.assert_fetch(approver, status.HTTP_200_OK)
+        self.assertEqual(response.data['count'], 0)
+
+        self.assert_create(admin, status.HTTP_201_CREATED)  # confirm by admin
+        response = self.assert_fetch(admin, status.HTTP_200_OK)
+        self.assertEqual(response.data['count'], 1)
+        response = self.assert_fetch(approver, status.HTTP_200_OK)
+        self.assertEqual(response.data['count'], 0)
+
+        self.assert_create(approver, status.HTTP_201_CREATED)  # confirm by approver
+        response = self.assert_fetch(admin, status.HTTP_200_OK)
+        self.assertEqual(response.data['count'], 1)
+        response = self.assert_fetch(approver, status.HTTP_200_OK)
         self.assertEqual(response.data['count'], 1)
-        self.assert_create(member2, status.HTTP_201_CREATED)  # toggle confirm
-        response = self.assert_fetch(member1, status.HTTP_200_OK)
+
+    def test_can_share_example_state_in_same_role(self):
+        annotator1 = make_user()
+        assign_user_to_role(annotator1, self.project.item, settings.ROLE_ANNOTATOR)
+        annotator2 = make_user()
+        assign_user_to_role(annotator2, self.project.item, settings.ROLE_ANNOTATOR)
+
+        response = self.assert_fetch(annotator1, status.HTTP_200_OK)
+        self.assertEqual(response.data['count'], 0)
+        response = self.assert_fetch(annotator2, status.HTTP_200_OK)
+        self.assertEqual(response.data['count'], 0)
+
+        self.assert_create(annotator1, status.HTTP_201_CREATED)  # confirm by annotator1
+        response = self.assert_fetch(annotator1, status.HTTP_200_OK)
+        self.assertEqual(response.data['count'], 1)
+        response = self.assert_fetch(annotator2, status.HTTP_200_OK)
+        self.assertEqual(response.data['count'], 1)
+
+        self.assert_create(annotator2, status.HTTP_201_CREATED)  # toggle confirm by annotator2
+        response = self.assert_fetch(annotator1, status.HTTP_200_OK)
+        self.assertEqual(response.data['count'], 0)
+        response = self.assert_fetch(annotator2, status.HTTP_200_OK)
         self.assertEqual(response.data['count'], 0)