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test: add edge-case test for empty tools list in validate_sampling_tools #3530

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test: add edge-case test for empty tools list in validate_sampling_tools #3530

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7 changes: 7 additions & 0 deletions tests/server/test_validation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,13 @@ def test_validate_sampling_tools_raises_when_tools_provided_but_no_capability()
assert "sampling tools capability" in str(exc_info.value)


def test_validate_sampling_tools_raises_when_empty_tools_list_but_no_capability() -> None:
"""An empty list [] is not None, so it still triggers the capability check."""
with pytest.raises(MCPError) as exc_info:
validate_sampling_tools(None, [], None)
assert "sampling tools capability" in str(exc_info.value)


def test_validate_sampling_tools_raises_when_tool_choice_provided_but_no_capability() -> None:
"""Raises MCPError when tool_choice provided but client doesn't support."""
with pytest.raises(MCPError) as exc_info:
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