diff --git a/tests/gateway/test_slack.py b/tests/gateway/test_slack.py
index 0eebf49c..e83b36dd 100644
--- a/tests/gateway/test_slack.py
+++ b/tests/gateway/test_slack.py
@@ -77,6 +77,14 @@ def adapter():
     # Mock the Slack app client
     a._app = MagicMock()
     a._app.client = AsyncMock()
+    # Default return values for methods called during _handle_slack_message
+    # to avoid "coroutine 'AsyncMockMixin._execute_mock_call' was never awaited"
+    # when the code does result.get(...) on a bare AsyncMock.
+    a._app.client.users_info = AsyncMock(
+        return_value={"user": {"name": "testuser", "real_name": "Test User"}}
+    )
+    a._app.client.conversations_replies = AsyncMock(return_value={"messages": []})
+    a._app.client.chat_postMessage = AsyncMock(return_value={"ts": "1234.5678"})
     a._bot_user_id = "U_BOT"
     a._running = True
     # Capture events instead of processing them
@@ -1860,6 +1868,13 @@ class TestThreadReplyHandling:
         a = SlackAdapter(config)
         a._app = MagicMock()
         a._app.client = AsyncMock()
+        # Default return values for methods called during _handle_slack_message
+        # to avoid "coroutine 'AsyncMockMixin._execute_mock_call' was never awaited"
+        # when the code does result.get(...) on a bare AsyncMock.
+        a._app.client.users_info = AsyncMock(
+            return_value={"user": {"name": "testuser", "real_name": "Test User"}}
+        )
+        a._app.client.conversations_replies = AsyncMock(return_value={"messages": []})
         a._bot_user_id = "U_BOT"
         a._team_bot_user_ids = {"T_TEAM": "U_BOT"}
         a._running = True
@@ -2000,6 +2015,12 @@ class TestAssistantThreadLifecycle:
         a = SlackAdapter(config)
         a._app = MagicMock()
         a._app.client = AsyncMock()
+        # Default return values to avoid "coroutine 'AsyncMockMixin._execute_mock_call'
+        # was never awaited" when code does result.get(...) on a bare AsyncMock.
+        a._app.client.users_info = AsyncMock(
+            return_value={"user": {"name": "testuser", "real_name": "Test User"}}
+        )
+        a._app.client.conversations_replies = AsyncMock(return_value={"messages": []})
         a._bot_user_id = "U_BOT"
         a._team_bot_user_ids = {"T_TEAM": "U_BOT"}
         a._running = True
diff --git a/tests/gateway/test_slack_approval_buttons.py b/tests/gateway/test_slack_approval_buttons.py
index bc12d007..44f87f5f 100644
--- a/tests/gateway/test_slack_approval_buttons.py
+++ b/tests/gateway/test_slack_approval_buttons.py
@@ -56,6 +56,14 @@ def _make_adapter():
     adapter._team_clients = {"T1": AsyncMock()}
     adapter._team_bot_user_ids = {"T1": "U_BOT"}
     adapter._channel_team = {"C1": "T1"}
+    # Default return values to avoid "coroutine 'AsyncMockMixin._execute_mock_call'
+    # was never awaited" when code does result.get(...) on a bare AsyncMock.
+    adapter._team_clients["T1"].users_info = AsyncMock(
+        return_value={"user": {"name": "testuser", "real_name": "Test User"}}
+    )
+    adapter._team_clients["T1"].conversations_replies = AsyncMock(
+        return_value={"messages": []}
+    )
     return adapter
 
 
@@ -411,6 +419,9 @@ class TestSlackThreadContext:
         adapter = _make_adapter()
         # Add a second workspace with a different bot user id
         adapter._team_clients["T2"] = AsyncMock()
+        adapter._team_clients["T2"].users_info = AsyncMock(
+            return_value={"user": {"name": "testuser", "real_name": "Test User"}}
+        )
         adapter._team_bot_user_ids = {"T1": "U_BOT_T1", "T2": "U_BOT_T2"}
         adapter._bot_user_id = "U_BOT_T1"
         adapter._channel_team["C2"] = "T2"