himaoka

@IsTest
private class ZenkakuToHankakuInvocableTest {

    @IsTest
    static void testConvert_MixedCharacters() {
        ZenkakuToHankakuInvocable.Request req = new ZenkakuToHankakuInvocable.Request();
        req.inputText = 'ＡＢＣ１２３　！＠＃　ガギグ　パピプ　ヴァイオリン';
        List<ZenkakuToHankakuInvocable.Response> results =
            ZenkakuToHankakuInvocable.convert(new List<ZenkakuToHankakuInvocable.Request>{ req });
        System.assertEquals('ABC123 !@# ｶﾞｷﾞｸﾞ ﾊﾟﾋﾟﾌﾟ ｳﾞｧｲｵﾘﾝ', results[0].outputText);

himaoka

public with sharing class ZenkakuToHankakuInvocable {

    public class Request {
        @InvocableVariable(required=true label='Input Text')
        public String inputText;
    }

    public class Response {
        @InvocableVariable(label='Converted Text')
        public String outputText;