Macro assert_tool_error_msg 

macro_rules! assert_tool_error_msg {
    ($result:expr, $expected:expr) => { ... };
}

Macro for asserting tool result error.

Example

use mcpkit_testing::assert_tool_error_msg;
use mcpkit_core::types::CallToolResult;

let result = CallToolResult::error("error message");
assert_tool_error_msg!(result, "error message");