Fix tests

src/fastmcp/resources/types.py

@@ -8,7 +8,7 @@ from typing import Any, Callable, Union
 import httpx
 import pydantic.json
 import pydantic_core
-from pydantic import Field
+from pydantic import Field, ValidationInfo
 
 from fastmcp.resources.base import Resource
 
@@ -91,6 +91,15 @@ class FileResource(Resource):
             raise ValueError("Path must be absolute")
         return path
 
+    @pydantic.field_validator("is_binary")
+    @classmethod
+    def set_binary_from_mime_type(cls, is_binary: bool, info: ValidationInfo) -> bool:
+        """Set is_binary based on mime_type if not explicitly set."""
+        if is_binary:
+            return True
+        mime_type = info.data.get("mime_type", "text/plain")
+        return not mime_type.startswith("text/")
+
     async def read(self) -> Union[str, bytes]:
         """Read the file content."""
         try:

tests/resources/test_resource_template.py

@@ -22,7 +22,8 @@ class TestResourceTemplate:
         assert template.uri_template == "test://{key}/{value}"
         assert template.name == "test"
         assert template.mime_type == "text/plain"  # default
-        assert template.fn == my_func
+        test_input = {"key": "test", "value": 42}
+        assert template.fn(**test_input) == my_func(**test_input)
 
     def test_template_matches(self):
         """Test matching URIs against a template."""