diff --git a/src/main/java/org/prgms/springbootjpa/mission2/domain/customer/Customer.java b/src/main/java/org/prgms/springbootjpa/mission2/domain/customer/Customer.java
new file mode 100644
index 000000000..fa4c904d5
--- /dev/null
+++ b/src/main/java/org/prgms/springbootjpa/mission2/domain/customer/Customer.java
@@ -0,0 +1,26 @@
+package org.prgms.springbootjpa.mission2.domain.customer;
+
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+@Entity
+@Getter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+@Table(name = "customers")
+public class Customer {
+    @Id
+    Long id;
+    String firstName;
+    String lastName;
+
+    public void changeFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+}
diff --git a/src/test/java/org/prgms/springbootjpa/mission2/domain/customer/CustomerRepositoryTest.java b/src/test/java/org/prgms/springbootjpa/mission2/domain/customer/CustomerRepositoryTest.java
new file mode 100644
index 000000000..b23775e79
--- /dev/null
+++ b/src/test/java/org/prgms/springbootjpa/mission2/domain/customer/CustomerRepositoryTest.java
@@ -0,0 +1,132 @@
+package org.prgms.springbootjpa.mission2.domain.customer;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.prgms.springbootjpa.mission1.customer.repository.CustomerRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.EntityTransaction;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+
+@SpringBootTest
+class CustomerRepositoryTest {
+    @Autowired
+    EntityManagerFactory emf;
+
+    @Autowired
+    CustomerRepository repository;
+
+    EntityManager entityManager;
+
+    EntityTransaction transaction;
+
+
+    @BeforeEach
+    void setUp() {
+        entityManager = emf.createEntityManager();
+        transaction = entityManager.getTransaction();
+        repository.deleteAll();
+    }
+
+    Customer customer = new Customer(1L, "hyeonji", "park");
+
+    @Test
+    void 저장() {
+        transaction.begin();
+
+        entityManager.persist(customer);
+
+        transaction.commit();
+    }
+
+    @Test
+    void 조회_1차캐시_이용() {
+        transaction.begin();
+
+        entityManager.persist(customer);
+
+        transaction.commit();
+
+        Customer entity = entityManager.find(Customer.class, customer.getId());
+        assertThat(entity, samePropertyValuesAs(customer));
+    }
+
+
+    @Test
+    void 조회_DB_이용() {
+        transaction.begin();
+
+        entityManager.persist(customer);
+
+        transaction.commit();
+
+        entityManager.detach(customer);
+
+        Customer entity = entityManager.find(Customer.class, customer.getId());
+        assertThat(entity, samePropertyValuesAs(customer));
+    }
+
+    @Test
+    void 수정_dirtyCheck_적용() {
+        transaction.begin();
+
+        entityManager.persist(customer);
+
+        transaction.commit();
+
+        transaction.begin();
+
+        customer.changeFirstName("hyeonz");
+
+        transaction.commit();
+
+        Customer entity = entityManager.find(Customer.class, customer.getId());
+        assertThat(entity.getFirstName(), is("hyeonz"));
+    }
+
+    @Test
+    void 수정_dirtyCheck_적용_안됨() {
+        transaction.begin();
+
+        entityManager.persist(customer);
+
+        transaction.commit();
+
+        entityManager.detach(customer);
+
+        transaction.begin();
+
+        customer.changeFirstName("hyeonz");
+
+        transaction.commit();
+
+        Customer afterEntity = entityManager.find(Customer.class, customer.getId());
+        assertThat(afterEntity.getFirstName(), not("hyeonz"));
+    }
+
+    @Test
+    void 삭제() {
+        transaction.begin();
+
+        entityManager.persist(customer);
+
+        transaction.commit();
+
+        transaction.begin();
+
+        Customer beforeCommit = entityManager.find(Customer.class, customer.getId());
+        assertThat(beforeCommit, samePropertyValuesAs(customer));
+
+        entityManager.remove(customer);
+
+        transaction.commit();
+
+        Customer afterCommit = entityManager.find(Customer.class, customer.getId());
+        assertThat(afterCommit, nullValue());
+    }
+}