DB 연동 코드도 대역을 사용 - #71

김정호/src/test/java/com/hou27/chap07/AutoDebitInfoRepository.java

@@ -0,0 +1,6 @@
+package com.hou27.chap07;
+
+public interface AutoDebitInfoRepository {
+  AutoDebitInfo findOne(String userId);
+  void save(AutoDebitInfo info);
+}

김정호/src/test/java/com/hou27/chap07/AutoDebitRegister_Fake_Test.java

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+package com.hou27.chap07;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.time.LocalDateTime;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class AutoDebitRegister_Fake_Test {
+  private AutoDebitRegister register;
+  private StubCardNumberValidator stubValidator;
+  private AutoDebitInfoRepository repository;
+
+  @BeforeEach
+  void setUp() {
+    stubValidator = new StubCardNumberValidator();
+    repository = new MemoryAutoDebitInfoRepository();
+    register = new AutoDebitRegister(stubValidator, repository);
+  }
+
+  @Test
+  void alreadyRegistered_InfoUpdated() {
+    repository.save(new AutoDebitInfo("user1", "123412349876", LocalDateTime.now()));
+
+    AutoDebitReq req = new AutoDebitReq("user1", "123412349999");
+    RegisterResult result = register.register(req);
+
+    AutoDebitInfo saved = repository.findOne("user1");
+    assertEquals("1234123412341235", saved.getCardNumber());
+  }
+
+  @Test
+  void notYetRegistered_newInfoRegistered() {
+    AutoDebitReq req = new AutoDebitReq("user1", "1234123412341234");
+    RegisterResult result = register.register(req);
+
+    AutoDebitInfo saved = repository.findOne("user1");
+    assertEquals("1234123412341234", saved.getCardNumber());
+  }
+}

김정호/src/test/java/com/hou27/chap07/MemoryAutoDebitInfoRepository.java

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+package com.hou27.chap07;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class MemoryAutoDebitInfoRepository implements AutoDebitInfoRepository {
+  private Map<String, AutoDebitInfo> infos = new HashMap<>();
+
+  @Override
+  public AutoDebitInfo findOne(String userId) {
+    return infos.get(userId);
+  }
+
+  @Override
+  public void save(AutoDebitInfo info) {
+    infos.put(info.getUserId(), info);
+  }
+}