Function domain_external_root_encryption_key_test 

pub async fn domain_external_root_encryption_key_test(
    configuration: &Configuration,
    domain_id: &str,
    root_encryption_key_id: &str,
    body: Value,
) -> Result<RootEncryptionKeyTestResponse, Error<DomainExternalRootEncryptionKeyTestError>>

Attempts to use a root encryption key to encrypt and decrypt, validating its availability