fix: 예약 가능 시간 조회 로직 오류 수정 및 테스트 케이스 추가

src/main/kotlin/roomescape/time/implement/TimeFinder.kt

@@ -51,7 +51,7 @@ class TimeFinder(
         val allTimes: List<TimeEntity> = findAll()
 
         return allTimes.map { time ->
-            val isReservable: Boolean = reservations.any { reservation -> time.id == reservation.id }
+            val isReservable: Boolean = reservations.none { reservation -> time.id == reservation.time.id }
             TimeWithAvailability(time.id!!, time.startAt, date, themeId, isReservable)
         }.also {
             log.debug { "[TimeFinder.findAllWithAvailabilityByDateAndThemeId] ${it.size}개 조회 완료: date:$date, themeId=$themeId" }

src/test/kotlin/roomescape/time/implement/TimeFinderTest.kt

@@ -10,6 +10,7 @@ import io.mockk.mockk
 import io.mockk.verify
 import org.springframework.data.repository.findByIdOrNull
 import roomescape.reservation.implement.ReservationFinder
+import roomescape.reservation.infrastructure.persistence.ReservationEntity
 import roomescape.time.business.domain.TimeWithAvailability
 import roomescape.theme.exception.ThemeErrorCode
 import roomescape.theme.exception.ThemeException
@@ -105,5 +106,39 @@ class TimeFinderTest : FunSpec({
                 it.all { time -> time.isReservable }
             }
         }
+
+        test("날짜, 테마에 맞는 예약이 있으면 예약할 수 없다.") {
+            val times = listOf(
+                TimeFixture.create(startAt = LocalTime.now()),
+                TimeFixture.create(startAt = LocalTime.now().plusMinutes(30))
+            )
+            every {
+                themeFinder.findById(themeId)
+            } returns mockk()
+
+            every {
+                timeRepository.findAll()
+            } returns times
+
+            every {
+                reservationFinder.findAllByDateAndTheme(date, any())
+            } returns listOf(
+                mockk<ReservationEntity>().apply {
+                    every { time.id } returns times[0].id
+                },
+                mockk<ReservationEntity>().apply {
+                    every { time.id } returns 0
+                }
+            )
+
+            val result: List<TimeWithAvailability> =
+                timeFinder.findAllWithAvailabilityByDateAndThemeId(date, themeId)
+
+            assertSoftly(result) {
+                it shouldHaveSize 2
+                it[0].isReservable shouldBe false
+                it[1].isReservable shouldBe true
+            }
+        }
     }
 })