in src/utils/mod.rs [749:757]
fn test_kms_sign_key_data_from_invalid_cert_key_info() -> Result<(), std::io::Error> {
let key_arn =
env::var("AWS_KMS_TEST_KEY_ARN").expect("Please set AWS_KMS_TEST_KEY_ARN");
let key_data = SignKeyData::new(&key_arn, Path::new("/incorrect/cert/path"));
assert!(key_data.is_err());
Ok(())
}