feat: 테스트 코드 격리 (#84)

* feat: 테스트 코드 격리

* fix: 중복 gradle 수정

* fix: guava 의존성 해제

* fix: guava 원복

* fix: DatabaseCleaner Service -> Component

* fix: unwrap 이슈로 해결 및 guava 의존성 해제

src/test/java/com/depromeet/DatabaseCleaner.java

@@ -0,0 +1,52 @@
+package com.depromeet;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.PersistenceContext;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.List;
+import java.util.stream.Collectors;
+import org.hibernate.Session;
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.stereotype.Component;
+
+@Component
+public class DatabaseCleaner implements InitializingBean {
+
+    @PersistenceContext private EntityManager entityManager;
+    private List<String> tableNames;
+
+    @Override
+    public void afterPropertiesSet() {
+        entityManager.unwrap(Session.class).doWork(this::extractTableNames);
+    }
+
+    private void extractTableNames(Connection conn) {
+        tableNames =
+                entityManager.getMetamodel().getEntities().stream()
+                        .map(e -> e.getName().replaceAll("([a-z])([A-Z])", "$1_$2").toLowerCase())
+                        .collect(Collectors.toList());
+    }
+
+    public void execute() {
+        entityManager.unwrap(Session.class).doWork(this::cleanUpDatabase);
+    }
+
+    private void cleanUpDatabase(Connection conn) throws SQLException {
+        Statement statement = conn.createStatement();
+        statement.executeUpdate("SET REFERENTIAL_INTEGRITY FALSE");
+
+        for (String tableName : tableNames) {
+            statement.executeUpdate("TRUNCATE TABLE " + tableName);
+            statement.executeUpdate(
+                    "ALTER TABLE "
+                            + tableName
+                            + " ALTER COLUMN "
+                            + tableName
+                            + "_id RESTART WITH 1");
+        }
+
+        statement.executeUpdate("SET REFERENTIAL_INTEGRITY TRUE");
+    }
+}