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: agreement_tests.rs
    path of file: ./repos/ring/tests
    
    the code of the file until where you have to start completion: // Copyright 2015-2017 Brian Smith.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

#[cfg(all(target_arch = "wasm32", target_os = "unknown"))]
use wasm_bindgen_test::{wasm_bindgen_test as test, wasm_bindgen_test_configure};

#[cfg(all(target_arch = "wasm32", target_os = "unknown"))]
wasm_bindgen_test_configure!(run_in_browser);

extern crate alloc;

use ring::{agreement, error, rand, test, test_file};

#[test]
fn agreement_traits() {
    use alloc::vec::Vec;

    let rng = rand::SystemRandom::new();
    let private_key =
        agreement::EphemeralPrivateKey::generate(&agreement::ECDH_P256, &rng).unwrap();

    test::compile_time_assert_send::<agreement::EphemeralPrivateKey>();
    test::compile_time_assert_sync::<agreement::EphemeralPrivateKey>();

    assert_eq!(
        format!("{:?}", &private_key),
        "EphemeralPrivateKey { algorithm: Algorithm { curve: P256 } }"
    );

    let public_key = private_key.compute_public_key().unwrap();

    test::compile_time_assert_clone::<agreement::PublicKey>();
    test::compile_time_assert_send::<agreement::PublicKey>();
    test::compile_time_assert_sync::<agreement::PublicKey>();

    // Verify `PublicKey` implements `Debug`.
    //
    // TODO: Test the actual output.
    let _: &dyn core::fmt::Debug = &public_key;

    test::compile_time_assert_clone::<agreement::UnparsedPublicKey<&[u8]>>();
    test::compile_time_assert_copy::<agreement::Unpa
    
fn agreement_agree_ephemeral() {
    let rng = rand::SystemRandom::new();

    test::run(test_file!("agreement_tests.txt"), |section, test_case| {
        assert_eq!(section, "");

        let curve_name = test_case.consume_string("Curve");
        let alg = alg_from_curve_name(&curve_name);
        let peer_public = agreement::UnparsedPublicKey::new(alg, test_case.consume_bytes("PeerQ"));

        match test_case.consume_optional_string("Error") {
            None => {
                let my_private = test_case.consume_bytes("D");
                let my_private = {
                    let rng = test::rand::FixedSliceRandom { bytes: &my_private };
                    agreement::EphemeralPrivateKey::generate(alg, &rng)?
                };
                let my_public = test_case.consume_bytes("MyQ");
                let output = test_case.consume_bytes("Output");

                assert_eq!(my_private.algorithm(), alg);

                let computed_public = my_private.compute_public_key().unwrap();
                assert_eq!(computed_public.as_ref(), &my_public[..]);

                assert_eq!(my_private.algorithm(), alg);

                let result = agreement::agree_ephemeral(my_private, &peer_public, |key_material| {
                    assert_eq!(key_material, &output[..]);
                });
                assert_eq!(result, Ok(()));
            }

            Some(_) => {
                // In the no-heap mode, some algorithms aren't supported so
                // we have to skip those algorithms' test cases.
                let dummy_private_key = agreement::EphemeralPrivateKey::generate(alg, &rng)?;
                fn kdf_not_called(_: &[u8]) -> Result<(), ()> {
                    panic!(
                        "The KDF was called during ECDH when the peer's \
                         public key is invalid."
                    );
                }
                assert!(agreement::agree_ephemeral(
                    dummy_private_key,
                    &peer_public,
                    kdf_not_called
                )
                .is_err());
            }
        }

        Ok(())
    });
}