rust test for error in rust

main.rs
#[cfg(test)]
mod tests {
    // Import the module containing the function to be tested
    use super::*;

    // Unit test for a function that returns a Result with an error
    #[test]
    fn test_function_return_error() {
        // Call the function that returns a Result with an error
        let result = function_return_error();

        // Check if the result is an error
        assert!(result.is_err());
    }
}
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