test: \@DataJpaTest 기반 MemberRepositoryTest 추가

src/test/kotlin/roomescape/member/infrastructure/persistence/MemberRepositoryTest.kt

@@ -0,0 +1,63 @@
+package roomescape.member.infrastructure.persistence
+
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.nulls.shouldNotBeNull
+import io.kotest.matchers.shouldBe
+import jakarta.persistence.EntityManager
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest
+import roomescape.util.MemberFixture
+
+@DataJpaTest(showSql = true)
+class MemberRepositoryTest(
+    val entityManager: EntityManager,
+    val memberRepository: MemberRepository
+) : FunSpec({
+    context("existsByEmail") {
+        val account = "email"
+        val email = "$account@email.com"
+
+        beforeTest {
+            entityManager.persist(MemberFixture.create(account = account))
+            entityManager.flush()
+            entityManager.clear()
+        }
+
+        test("동일한 이메일이 있으면 true 반환") {
+            val result = memberRepository.existsByEmail(email)
+            result shouldBe true
+        }
+
+        test("동일한 이메일이 없으면 false 반환") {
+            memberRepository.existsByEmail(email.substring(email.length - 1)) shouldBe false
+        }
+    }
+
+    context("findByEmailAndPassword") {
+        val account = "email"
+        val email = "$account@email.com"
+        val password = "password123"
+
+        beforeTest {
+            entityManager.persist(MemberFixture.create(account = account, password = password))
+            entityManager.flush()
+            entityManager.clear()
+        }
+
+        test("둘다 일치하면 정상 반환") {
+            memberRepository.findByEmailAndPassword(email, password) shouldNotBeNull {
+                this.email shouldBe email
+                this.password shouldBe password
+            }
+        }
+
+        test("이메일이 틀리면 null 반환") {
+            val invalidMail = email.substring(email.length - 1)
+            memberRepository.findByEmailAndPassword(invalidMail, password) shouldBe null
+        }
+
+        test("비밀번호가 틀리면 null 반환") {
+            val invalidPassword = password.substring(password.length - 1)
+            memberRepository.findByEmailAndPassword(email, invalidPassword) shouldBe null
+        }
+    }
+})