fix: Add pragma no cover to unreachable test branches

Mark type-check branches and error handlers in tests as excluded from
coverage. These branches handle alternative return types or defensive
error conditions that don't execute during normal test runs.

Author: alexanderreiff

tests/issues/test_141_resource_templates.py

@@ -61,11 +61,11 @@ def get_user_profile_missing(user_id: str) -> str:  # pragma: no cover
     if isinstance(content, ReadResourceContents):
         assert content.content == "Post 456 by user 123"
         assert content.mime_type == "text/plain"
-    elif isinstance(content, TextResourceContents):
+    elif isinstance(content, TextResourceContents):  # pragma: no cover
         # If it's TextResourceContents (direct return)
         assert content.text == "Post 456 by user 123"
         assert content.mimeType == "text/plain"
-    else:
+    else:  # pragma: no cover
         # Should not happen for string resources
         raise AssertionError(f"Unexpected content type: {type(content)}")
 

tests/server/fastmcp/servers/test_file_server.py

@@ -100,10 +100,10 @@ async def test_read_resource_dir(mcp: FastMCP):
     if isinstance(res, ReadResourceContents):
         assert res.mime_type == "text/plain"
         files = json.loads(res.content)
-    elif isinstance(res, TextResourceContents):
+    elif isinstance(res, TextResourceContents):  # pragma: no cover
         assert res.mimeType == "text/plain"
         files = json.loads(res.text)
-    else:
+    else:  # pragma: no cover
         raise AssertionError(f"Unexpected content type: {type(res)}")
 
     assert sorted([Path(f).name for f in files]) == [
@@ -126,9 +126,9 @@ async def test_read_resource_file(mcp: FastMCP):
 
     if isinstance(res, ReadResourceContents):
         assert res.content == "print('hello world')"
-    elif isinstance(res, TextResourceContents):
+    elif isinstance(res, TextResourceContents):  # pragma: no cover
         assert res.text == "print('hello world')"
-    else:
+    else:  # pragma: no cover
         raise AssertionError(f"Unexpected content type: {type(res)}")
 
 
@@ -152,7 +152,7 @@ async def test_delete_file_and_check_resources(mcp: FastMCP, test_dir: Path):
 
     if isinstance(res, ReadResourceContents):
         assert res.content == "File not found"
-    elif isinstance(res, TextResourceContents):
+    elif isinstance(res, TextResourceContents):  # pragma: no cover
         assert res.text == "File not found"
-    else:
+    else:  # pragma: no cover
         raise AssertionError(f"Unexpected content type: {type(res)}")

tests/server/fastmcp/test_server.py

@@ -1088,9 +1088,9 @@ async def tool_with_resource(ctx: Context[ServerSession, None]) -> str:
 
             if isinstance(r, ReadResourceContents):
                 return f"Read resource: {r.content} with mime type {r.mime_type}"
-            elif isinstance(r, TextResourceContents):
+            elif isinstance(r, TextResourceContents):  # pragma: no cover
                 return f"Read resource: {r.text} with mime type {r.mimeType}"
-            else:
+            else:  # pragma: no cover
                 raise AssertionError(f"Unexpected content type: {type(r)}")
 
         async with client_session(mcp._mcp_server) as client:

tests/server/test_read_resource_direct.py

@@ -18,7 +18,7 @@ def temp_file():
     yield path
     try:
         path.unlink()
-    except FileNotFoundError:
+    except FileNotFoundError:  # pragma: no cover
         pass