fix assert used

tests/test_dispatcher.py

@@ -542,3 +542,42 @@ async def test_dispatch_uses_coordinator_tool_calling(mock_coord_class: MagicMoc
     )
 
 
+async def test_dispatcher_raises_type_error_for_invalid_task_info() -> None:
+    mock_client: MagicMock = MagicMock(spec=GiteaClient)
+    mock_tools: MagicMock = MagicMock(spec=GiteaTools)
+    
+    # Mock return values for methods called prior to the isinstance check
+    mock_client.list_repo_pull_requests.return_value = []
+    mock_client.get_issue_comments.return_value = []
+    mock_client.get_authenticated_user.return_value = UserModel(login="meeks-ai")
+
+    dispatcher = AgentDispatcher(client=mock_client, tools=mock_tools)
+
+    # 1. Test dispatch raises TypeError if task_info is not IssueModel for an issue task
+    work_item_invalid_issue = WorkItem(
+        repo_full_name="meeks/repo1",
+        task_type="issue",
+        task_number=42,
+        task_info=PullRequestModel(number=42),  # Invalid model type
+        priority=0
+    )
+    with pytest.raises(TypeError, match="Expected task_info to be an IssueModel"):
+        await dispatcher.dispatch("meeks/repo1", [work_item_invalid_issue])
+
+    # 2. Test _build_pr_mission raises TypeError if task_info is not PullRequestModel
+    work_item_invalid_pr = WorkItem(
+        repo_full_name="meeks/repo1",
+        task_type="pr",
+        task_number=42,
+        task_info=IssueModel(number=42),  # Invalid model type
+        priority=0
+    )
+    with pytest.raises(TypeError, match="Expected task_info to be a PullRequestModel"):
+        dispatcher._build_pr_mission(work_item_invalid_pr)
+
+    # 3. Test _build_issue_mission raises TypeError if task_info is not IssueModel
+    with pytest.raises(TypeError, match="Expected task_info to be an IssueModel"):
+        dispatcher._build_issue_mission(work_item_invalid_issue)
+
+
+