You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: example_test.rs
    path of file: ./repos/nushell/crates/nu-cmd-lang/src
    
    the code of the file until where you have to start completion: #[cfg(test)]
use nu_protocol::engine::Command;

#[cfg(test)]
pub fn test_examples(cmd: impl Command + 'static) {
    test_examples::test_examples(cmd);
}

#[cfg(test)]
mod test_examples {
    use crate::example_support::{
        check_all_signature_input_output_types_entries_have_examples,
        check_example_evaluates_to_expected_output,
        check_example_input_and_output_types_match_command_signature,
    };
    use crate::{
        Break, Coll
    
    pub fn test_examples(cmd: impl Command + 'static) {
        let examples = cmd.examples();
        let signature = cmd.signature();
        let mut engine_state = make_engine_state(cmd.clone_box());

        let cwd = std::env::current_dir().expect("Could not get current working directory.");

        let mut witnessed_type_transformations = HashSet::<(Type, Type)>::new();

        for example in examples {
            if example.result.is_none() {
                continue;
            }
            witnessed_type_transformations.extend(
                check_example_input_and_output_types_match_command_signature(
                    &example,
                    &cwd,
                    &mut make_engine_state(cmd.clone_box()),
                    &signature.input_output_types,
                    signature.operates_on_cell_paths(),
                ),
            );
            check_example_evaluates_to_expected_output(&example, cwd.as_path(), &mut engine_state);
        }

        check_all_signature_input_output_types_entries_have_examples(
            signature,
            witnessed_type_transformations,
        );
    }