My apologies, the correct code is:

function test_diners_new_address() {
	$adapters = apply_filters( 'wallets_api_adapters', array() );
	if ( ! isset( $adapters['DNS'] ) ) {
		error_log( 'DNS adapter not found' );
	}
	$address1 = $adapters['DNS']->get_new_address();
	error_log( 'ADDRESS1: ' . print_r( $address1, true ) );

	$address2 = apply_filters( 'wallets_api_deposit_address', null, array( 'symbol' => 'DNS' ) );
	error_log( 'ADDRESS2: ' . print_r( $address2, true ) );
}

add_action( 'init', 'test_diners_new_address' );