대역의 필요성 - #72

김연지/src/main/java/study/tdd/chap07/AutoDebitInfoRepository.java

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+package study.tdd.chap07;
+
+public class AutoDebitInfoRepository {
+}

김연지/src/main/java/study/tdd/chap07/AutoDebitRegister.java

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+package study.tdd.chap07;
+
+import java.time.LocalDateTime;
+
+public class AutoDebitRegister {
+    private CardNumberValidator validator;
+    private AutoDebitInfoRepository repository;
+
+    public AutoDebitRegister(CardNumberValidator validator, AutoDebitInfoRepository repository) {
+        this.validator = validator;
+        this.repository = repository;
+    }
+
+    public RegisterResult register(AutoDebitReq req) {
+        CardValidity validity = validator.validate(req.getCardNumber());
+
+        if (validity != CardValidity.VALID) {
+            return RegisterResult.error(validity);
+        }
+
+        AutoDebitInfo info = repository.findOne(req.getUserId());
+
+        if (info != null) {
+            info.changeCardNumber(req.getCardNumber());
+        } else {
+            AutoDebitInfo newInfo = new AutoDebitInfo(req.getUserId(), req.getCardNumber(), LocalDateTime.now());
+            repository.save(newInfo);
+        }
+
+        return RegisterResult.success();
+    }
+}

김연지/src/main/java/study/tdd/chap07/CardNumberValidator.java

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+package study.tdd.chap07;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+
+public class CardNumberValidator {
+    public CardValidity validate(String cardNumber) {
+        HttpClient httpClient = HttpClient.newHttpClient();
+        HttpRequest request = HttpRequest.newBuilder()
+                .uri(URI.create("https://some-external-pg.com/card"))
+                .header("Content-Type", "text/plain")
+                .POST(HttpRequest.BodyPublishers.ofString(cardNumber))
+                .build();
+
+        try {
+            HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
+            switch (response.body()) {
+                case "ok":
+                    return CardValidity.VALID;
+                case "bad":
+                    return CardValidity.INVALID;
+                case "expired":
+                    return CardValidity.EXPIRED;
+                case "theft":
+                    return CardValidity.THEFT;
+                default:
+                    return CardValidity.UNKNOWN;
+            }
+        } catch (IOException | InterruptedException exception) {
+            return CardValidity.ERROR;
+        }
+    }
+}

김연지/src/test/java/study/tdd/chap07/AutoDebitRegisterTest.java

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+package study.tdd.chap07;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class AutoDebitRegisterTest {
+    private AutoDebitRegister register;
+
+    @BeforeEach
+    void setUp() {
+        CardNumberValidator validator = new CardNumberValidator();
+        AutoDebitInfoRepository repository = new JpaAutoDebitInfoRepository();
+        register = new AutoDebitRegister(validator, repository);
+    }
+
+    @Test
+    void validCard() {
+        // 업체에서 받은 테스트용 유효한 카드번호 사용
+        AutoDebitReq req = new AutoDebitReq("user1", "1234123412341234");
+        RegisterResult result = this.register.register(req);
+        assertEquals(VALID, result.getValidity());
+    }
+
+    @Test
+    void theftCard() {
+        // 업체에서 받은 도난 테스트용 카드번호 사용
+        AutoDebitReq req = new AutoDebitReq("user1", "1234567890123456");
+        RegisterResult result = this.register.register(req);
+        assertEquals(THEFT, result.getValidity());
+    }
+}