refactor: 테스트간 격리를 위한 데이터베이스 로직 beforeSpec -> beforeTest 변경

src/test/java/roomescape/theme/infrastructure/persistence/ThemeRepositoryTest.kt

@@ -5,24 +5,18 @@ import io.kotest.matchers.collections.shouldContainInOrder
 import io.kotest.matchers.shouldBe
 import jakarta.persistence.EntityManager
 import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest
-import org.springframework.transaction.support.TransactionTemplate
 import roomescape.theme.util.TestThemeCreateUtil
 import java.time.LocalDate
 
 @DataJpaTest
 class ThemeRepositoryTest(
         val themeRepository: ThemeRepository,
-        val transactionTemplate: TransactionTemplate,
         val entityManager: EntityManager
 ) : FunSpec() {
 
     init {
-        beforeSpec {
-            /**
-             * 테마 10개를 생성한다.
-             * 이름: "테마N", 예약 수: N, 날짜: 오늘 기준으로 N일 전
-             */
-            transactionTemplate.executeWithoutResult {
+        context("findTopNThemeBetweenStartDateAndEndDate") {
+            beforeTest {
                 for (i in 1..10) {
                     TestThemeCreateUtil.createThemeWithReservations(
                             entityManager = entityManager,
@@ -32,9 +26,7 @@ class ThemeRepositoryTest(
                     )
                 }
             }
-        }
 
-        context("findTopNThemeBetweenStartDateAndEndDate") {
             test("지난 10일간 예약 수가 가장 많은 테마 5개를 조회한다.") {
                 themeRepository.findTopNThemeBetweenStartDateAndEndDate(
                         LocalDate.now().minusDays(10),