Raise errors when deprecated routes are used

pyproject.toml

@@ -86,7 +86,7 @@ fallback-version = "0.0.0"
 asyncio_mode = "auto"
 asyncio_default_fixture_loop_scope = "session"
 asyncio_default_test_loop_scope = "session"
-filterwarnings = []
+filterwarnings = ["error::DeprecationWarning"]
 timeout = 3
 env = [
     "FASTMCP_TEST_MODE=1",

tests/deprecated/__init__.py

@@ -0,0 +1,4 @@
+import pytest
+
+# reset deprecation warnings for this module
+pytestmark = pytest.mark.filterwarnings("default::DeprecationWarning")

tests/deprecated/test_deprecated.py

@@ -1,5 +1,3 @@
-"""Tests for deprecated functionality."""
-
 import warnings
 from unittest.mock import AsyncMock, patch
 
@@ -8,6 +6,9 @@ from starlette.applications import Starlette
 
 from fastmcp import Client, FastMCP
 
+# reset deprecation warnings for this module
+pytestmark = pytest.mark.filterwarnings("default::DeprecationWarning")
+
 
 def test_sse_app_deprecation_warning():
     """Test that sse_app raises a deprecation warning."""

tests/deprecated/test_mount_separators.py

@@ -4,6 +4,9 @@ import pytest
 
 from fastmcp import FastMCP
 
+# reset deprecation warnings for this module
+pytestmark = pytest.mark.filterwarnings("default::DeprecationWarning")
+
 
 def test_mount_tool_separator_deprecation_warning():
     """Test that using tool_separator in mount() raises a deprecation warning."""

tests/deprecated/test_resource_prefixes.py

@@ -1,5 +1,7 @@
 """Tests for legacy resource prefix behavior."""
 
+import pytest
+
 from fastmcp import Client, FastMCP
 from fastmcp.server.server import (
     add_resource_prefix,
@@ -8,6 +10,9 @@ from fastmcp.server.server import (
 )
 from fastmcp.utilities.tests import temporary_settings
 
+# reset deprecation warnings for this module
+pytestmark = pytest.mark.filterwarnings("default::DeprecationWarning")
+
 
 class TestLegacyResourcePrefixes:
     """Test the legacy resource prefix behavior."""

tests/deprecated/test_route_type_ignore.py

@@ -12,6 +12,9 @@ from fastmcp.server.openapi import (
     RouteType,
 )
 
+# reset deprecation warnings for this module
+pytestmark = pytest.mark.filterwarnings("default::DeprecationWarning")
+
 
 def test_route_type_ignore_deprecation_warning():
     """Test that using RouteType.IGNORE emits a deprecation warning."""