From 54e47bb3a1e19b1539d6a8b658c90005545183b8 Mon Sep 17 00:00:00 2001
From: heznpc <heznpc@gmail.com>
Date: Thu, 7 May 2026 16:17:49 +0900
Subject: [PATCH] test: add greet input-bound enforcement (min_length=1,
 max_length=200)

---
 .coverage           | Bin 0 -> 53248 bytes
 tests/test_tools.py |  31 +++++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 .coverage

diff --git a/.coverage b/.coverage
new file mode 100644
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diff --git a/tests/test_tools.py b/tests/test_tools.py
index 956e1cc..ee91c97 100644
--- a/tests/test_tools.py
+++ b/tests/test_tools.py
@@ -1,5 +1,8 @@
 """Tests for MCP server tools."""
 
+import pytest
+from pydantic import ValidationError, validate_call
+
 from my_mcp_server.server import greet
 
 
@@ -13,3 +16,31 @@ async def test_greet_custom_name():
     """Greet handles custom names."""
     result = await greet(name="Ploidy")
     assert result == "Hello, Ploidy!"
+
+
+# --- input bound enforcement -----------------------------------------------
+# Calling the tool function directly bypasses FastMCP's protocol-level
+# schema validation. Wrapping with `validate_call` is the same enforcement
+# FastMCP applies, so we cover Annotated[..., Field(min_length, max_length)]
+# without spinning up the MCP transport.
+
+_validated_greet = validate_call(greet)
+
+
+async def test_greet_rejects_empty_name():
+    """min_length=1 — empty string must be rejected at the protocol layer."""
+    with pytest.raises(ValidationError):
+        await _validated_greet(name="")
+
+
+async def test_greet_rejects_oversize_name():
+    """max_length=200 — long strings must be rejected."""
+    with pytest.raises(ValidationError):
+        await _validated_greet(name="x" * 201)
+
+
+async def test_greet_accepts_boundary_lengths():
+    """1 and 200 are inclusive bounds and must pass."""
+    assert await _validated_greet(name="a") == "Hello, a!"
+    long_name = "a" * 200
+    assert await _validated_greet(name=long_name) == f"Hello, {long_name}!"