diff --git a/src/test/kotlin/roomescape/reservation/business/ReservationServiceTest.kt b/src/test/kotlin/roomescape/reservation/business/ReservationServiceTest.kt
index 32efd17d..cef5672c 100644
--- a/src/test/kotlin/roomescape/reservation/business/ReservationServiceTest.kt
+++ b/src/test/kotlin/roomescape/reservation/business/ReservationServiceTest.kt
@@ -5,11 +5,13 @@ import io.kotest.core.spec.style.FunSpec
 import io.kotest.matchers.shouldBe
 import io.mockk.every
 import io.mockk.mockk
+import org.springframework.data.repository.findByIdOrNull
 import roomescape.member.business.MemberService
 import roomescape.member.infrastructure.persistence.Role
 import roomescape.reservation.exception.ReservationErrorCode
 import roomescape.reservation.exception.ReservationException
 import roomescape.reservation.infrastructure.persistence.ReservationRepository
+import roomescape.reservation.infrastructure.persistence.ReservationStatus
 import roomescape.theme.business.ThemeService
 import roomescape.time.business.TimeService
 import roomescape.util.MemberFixture
@@ -121,6 +123,56 @@ class ReservationServiceTest : FunSpec({
         }
     }
 
+    context("예약 대기를 취소할 때") {
+        val reservationId = 1L
+        val member = MemberFixture.create(id = 1L, role = Role.MEMBER)
+        test("예약을 찾을 수 없으면 예외를 던진다.") {
+            every {
+                reservationRepository.findByIdOrNull(reservationId)
+            } returns null
+
+            shouldThrow<ReservationException> {
+                reservationService.deleteWaiting(reservationId, member.id!!)
+            }.also {
+                it.errorCode shouldBe ReservationErrorCode.RESERVATION_NOT_FOUND
+            }
+        }
+
+        test("대기중인 해당 예약이 이미 확정된 상태라면 예외를 던진다.") {
+            val alreadyConfirmed = ReservationFixture.create(
+                    id = reservationId,
+                    status = ReservationStatus.CONFIRMED
+            )
+            every {
+                reservationRepository.findByIdOrNull(reservationId)
+            } returns alreadyConfirmed
+
+            shouldThrow<ReservationException> {
+                reservationService.deleteWaiting(reservationId, member.id!!)
+            }.also {
+                it.errorCode shouldBe ReservationErrorCode.ALREADY_CONFIRMED
+            }
+        }
+
+        test("타인의 대기를 취소하려고 하면 예외를 던진다.") {
+            val otherMembersWaiting = ReservationFixture.create(
+                    id = reservationId,
+                    member = MemberFixture.create(id = member.id!! + 1L),
+                    status = ReservationStatus.WAITING
+            )
+
+            every {
+                reservationRepository.findByIdOrNull(reservationId)
+            } returns otherMembersWaiting
+
+            shouldThrow<ReservationException> {
+                reservationService.deleteWaiting(reservationId, member.id!!)
+            }.also {
+                it.errorCode shouldBe ReservationErrorCode.NOT_RESERVATION_OWNER
+            }
+        }
+    }
+
     context("예약을 조회할 때") {
         test("종료 날짜가 시작 날짜보다 이전이면 예외를 던진다.") {
             val startFrom = LocalDate.now()
@@ -173,4 +225,61 @@ class ReservationServiceTest : FunSpec({
             }
         }
     }
+
+    context("대기중인 예약을 거절할 때") {
+        test("관리자가 아니면 예외를 던진다.") {
+            val member = MemberFixture.create(id = 1L, role = Role.MEMBER)
+
+            every {
+                memberService.findById(any())
+            } returns member
+
+            shouldThrow<ReservationException> {
+                reservationService.rejectWaiting(1L, member.id!!)
+            }.also {
+                it.errorCode shouldBe ReservationErrorCode.NO_PERMISSION
+            }
+        }
+
+        test("예약을 찾을 수 없으면 예외를 던진다.") {
+            val member = MemberFixture.create(id = 1L, role = Role.ADMIN)
+            val reservationId = 1L
+
+            every {
+                memberService.findById(member.id!!)
+            } returns member
+
+            every {
+                reservationRepository.findByIdOrNull(reservationId)
+            } returns null
+
+            shouldThrow<ReservationException> {
+                reservationService.rejectWaiting(reservationId, member.id!!)
+            }.also {
+                it.errorCode shouldBe ReservationErrorCode.RESERVATION_NOT_FOUND
+            }
+        }
+
+        test("이미 확정된 예약이면 예외를 던진다.") {
+            val member = MemberFixture.create(id = 1L, role = Role.ADMIN)
+            val reservation = ReservationFixture.create(
+                    id = 1L,
+                    status = ReservationStatus.CONFIRMED
+            )
+
+            every {
+                memberService.findById(member.id!!)
+            } returns member
+
+            every {
+                reservationRepository.findByIdOrNull(reservation.id!!)
+            } returns reservation
+
+            shouldThrow<ReservationException> {
+                reservationService.rejectWaiting(reservation.id!!, member.id!!)
+            }.also {
+                it.errorCode shouldBe ReservationErrorCode.ALREADY_CONFIRMED
+            }
+        }
+    }
 })
diff --git a/src/test/kotlin/roomescape/time/business/TimeServiceTest.kt b/src/test/kotlin/roomescape/time/business/TimeServiceTest.kt
index ba12249e..a3d9801a 100644
--- a/src/test/kotlin/roomescape/time/business/TimeServiceTest.kt
+++ b/src/test/kotlin/roomescape/time/business/TimeServiceTest.kt
@@ -1,9 +1,12 @@
 package roomescape.time.business
 
+import io.kotest.assertions.throwables.shouldNotThrow
 import io.kotest.assertions.throwables.shouldThrow
 import io.kotest.core.spec.style.FunSpec
 import io.kotest.matchers.shouldBe
+import io.mockk.Runs
 import io.mockk.every
+import io.mockk.just
 import io.mockk.mockk
 import org.springframework.data.repository.findByIdOrNull
 import roomescape.reservation.infrastructure.persistence.ReservationRepository
@@ -63,6 +66,19 @@ class TimeServiceTest : FunSpec({
     }
 
     context("removeTimeById") {
+        test("정상 제거 및 응답") {
+            val id = 1L
+            val time = TimeFixture.create(id = id)
+
+            every { timeRepository.findByIdOrNull(id) } returns time
+            every { reservationRepository.findAllByTime(time) } returns emptyList()
+            every { timeRepository.delete(time) } just Runs
+
+            shouldNotThrow<Exception> {
+                timeService.deleteTime(id)
+            }
+        }
+
         test("시간을 찾을 수 없으면 예외 응답") {
             val id = 1L