diff --git a/api/src/test/kotlin/com/few/api/domain/article/usecase/ReadArticleUseCaseTest.kt b/api/src/test/kotlin/com/few/api/domain/article/usecase/ReadArticleUseCaseTest.kt
new file mode 100644
index 000000000..914fa4812
--- /dev/null
+++ b/api/src/test/kotlin/com/few/api/domain/article/usecase/ReadArticleUseCaseTest.kt
@@ -0,0 +1,75 @@
+package com.few.api.domain.article.usecase
+
+import com.few.api.domain.article.service.BrowseArticleProblemsService
+import com.few.api.domain.article.service.ReadArticleWriterRecordService
+import com.few.api.domain.article.service.dto.BrowseArticleProblemsOutDto
+import com.few.api.domain.article.service.dto.ReadWriterOutDto
+import com.few.api.domain.article.usecase.dto.ReadArticleUseCaseIn
+import com.few.api.repo.dao.article.ArticleDao
+import com.few.api.repo.dao.article.record.SelectArticleRecord
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.core.spec.style.BehaviorSpec
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.verify
+
+import java.net.URL
+import java.time.LocalDateTime
+
+class ReadArticleUseCaseTest : BehaviorSpec({
+
+    lateinit var articleDao: ArticleDao
+    lateinit var readArticleWriterRecordService: ReadArticleWriterRecordService
+    lateinit var browseArticleProblemsService: BrowseArticleProblemsService
+    lateinit var useCase: ReadArticleUseCase
+    val useCaseIn = ReadArticleUseCaseIn(articleId = 1L)
+
+    beforeContainer {
+        articleDao = mockk<ArticleDao>()
+        readArticleWriterRecordService = mockk<ReadArticleWriterRecordService>()
+        browseArticleProblemsService = mockk<BrowseArticleProblemsService>()
+        useCase = ReadArticleUseCase(articleDao, readArticleWriterRecordService, browseArticleProblemsService)
+    }
+
+    given("아티클 조회 요청이 온 상황에서") {
+        `when`("아티클과 작가가 존재할 경우") {
+            val record = SelectArticleRecord(
+                articleId = 1L,
+                writerId = 1L,
+                mainImageURL = URL("https://jh-labs.tistory.com/"),
+                title = "title",
+                category = (10).toByte(),
+                content = "content",
+                createdAt = LocalDateTime.now()
+            )
+            val writerSvcOutDto = ReadWriterOutDto(
+                writerId = 1L,
+                name = "hunca",
+                url = URL("https://jh-labs.tistory.com/")
+            )
+            val probSvcOutDto = BrowseArticleProblemsOutDto(problemIds = listOf(1, 2, 3))
+
+            every { articleDao.selectArticleRecord(any()) } returns record
+            every { readArticleWriterRecordService.execute(any()) } returns writerSvcOutDto
+            every { browseArticleProblemsService.execute(any()) } returns probSvcOutDto
+
+            then("아티클이 정상 조회된다") {
+                useCase.execute(useCaseIn)
+
+                verify(exactly = 1) { articleDao.selectArticleRecord(any()) }
+                verify(exactly = 1) { readArticleWriterRecordService.execute(any()) }
+                verify(exactly = 1) { browseArticleProblemsService.execute(any()) }
+            }
+        }
+
+        `when`("존재하지 않는 아티클일 경우") {
+            every { articleDao.selectArticleRecord(any()) } returns null
+
+            then("예외가 발생한다") {
+                shouldThrow<Exception> { useCase.execute(useCaseIn) }
+
+                verify(exactly = 1) { articleDao.selectArticleRecord(any()) }
+            }
+        }
+    }
+})
\ No newline at end of file
diff --git a/api/src/test/kotlin/com/few/api/domain/problem/usecase/BrowseProblemsUseCaseTest.kt b/api/src/test/kotlin/com/few/api/domain/problem/usecase/BrowseProblemsUseCaseTest.kt
new file mode 100644
index 000000000..ca54ea69e
--- /dev/null
+++ b/api/src/test/kotlin/com/few/api/domain/problem/usecase/BrowseProblemsUseCaseTest.kt
@@ -0,0 +1,45 @@
+package com.few.api.domain.problem.usecase
+
+import com.few.api.domain.problem.usecase.dto.BrowseProblemsUseCaseIn
+import com.few.api.repo.dao.problem.ProblemDao
+import com.few.api.repo.dao.problem.record.ProblemIdsRecord
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.core.spec.style.BehaviorSpec
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.verify
+
+class BrowseProblemsUseCaseTest : BehaviorSpec({
+
+    lateinit var problemDao: ProblemDao
+    lateinit var useCase: BrowseProblemsUseCase
+    val useCaseIn = BrowseProblemsUseCaseIn(articleId = 1L)
+
+    beforeContainer {
+        problemDao = mockk<ProblemDao>()
+        useCase = BrowseProblemsUseCase(problemDao)
+    }
+
+    given("특정 아티클에 대한") {
+        `when`("문제가 존재할 경우") {
+            val problemIdsRecord = ProblemIdsRecord(listOf(1, 2, 3))
+            every { problemDao.selectProblemsByArticleId(any()) } returns problemIdsRecord
+
+            then("문제번호가 정상적으로 조회된다") {
+                useCase.execute(useCaseIn)
+
+                verify(exactly = 1) { problemDao.selectProblemsByArticleId(any()) }
+            }
+        }
+
+        `when`("문제가 존재하지 않을 경우") {
+            every { problemDao.selectProblemsByArticleId(any()) } returns null
+
+            then("예외가 발생한다") {
+                shouldThrow<Exception> { useCase.execute(useCaseIn) }
+
+                verify(exactly = 1) { problemDao.selectProblemsByArticleId(any()) }
+            }
+        }
+    }
+})
\ No newline at end of file
diff --git a/api/src/test/kotlin/com/few/api/domain/problem/usecase/CheckProblemUseCaseTest.kt b/api/src/test/kotlin/com/few/api/domain/problem/usecase/CheckProblemUseCaseTest.kt
new file mode 100644
index 000000000..5bdd418b4
--- /dev/null
+++ b/api/src/test/kotlin/com/few/api/domain/problem/usecase/CheckProblemUseCaseTest.kt
@@ -0,0 +1,74 @@
+package com.few.api.domain.problem.usecase
+
+import com.few.api.domain.problem.usecase.dto.CheckProblemUseCaseIn
+import com.few.api.repo.dao.problem.ProblemDao
+import com.few.api.repo.dao.problem.SubmitHistoryDao
+import com.few.api.repo.dao.problem.record.SelectProblemAnswerRecord
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.core.spec.style.BehaviorSpec
+import io.kotest.matchers.shouldBe
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.verify
+
+class CheckProblemUseCaseTest : BehaviorSpec({
+
+    lateinit var problemDao: ProblemDao
+    lateinit var submitHistoryDao: SubmitHistoryDao
+    lateinit var useCase: CheckProblemUseCase
+
+    beforeContainer {
+        problemDao = mockk<ProblemDao>()
+        submitHistoryDao = mockk<SubmitHistoryDao>()
+        useCase = CheckProblemUseCase(problemDao, submitHistoryDao)
+    }
+
+    given("문제 정답 확인 요청이 온 상황에서") {
+        `when`("제출 값과 문제 정답이 같을 경우") {
+            val submissionVal = "1"
+            val answer = submissionVal
+            val useCaseIn = CheckProblemUseCaseIn(problemId = 1L, sub = submissionVal)
+            val answerRecord = SelectProblemAnswerRecord(id = 1L, answer = answer, explanation = "해설입니다.")
+
+            every { problemDao.selectProblemAnswer(any()) } returns answerRecord
+            every { submitHistoryDao.insertSubmitHistory(any()) } returns 1L
+
+            then("문제가 정답처리 된다") {
+                val useCaseOut = useCase.execute(useCaseIn)
+
+                useCaseOut.isSolved shouldBe true
+                verify(exactly = 1) { problemDao.selectProblemAnswer(any()) }
+                verify(exactly = 1) { submitHistoryDao.insertSubmitHistory(any()) }
+            }
+        }
+
+        `when`("제출 값과 문제 정답이 다를 경우") {
+            val submissionVal = "1"
+            val answer = "2"
+            val useCaseIn = CheckProblemUseCaseIn(problemId = 1L, sub = submissionVal)
+            val answerRecord = SelectProblemAnswerRecord(id = 1L, answer = answer, explanation = "해설입니다.")
+
+            every { problemDao.selectProblemAnswer(any()) } returns answerRecord
+            every { submitHistoryDao.insertSubmitHistory(any()) } returns 1L
+
+            then("문제가 오답처리 된다") {
+                val useCaseOut = useCase.execute(useCaseIn)
+
+                useCaseOut.isSolved shouldBe false
+                verify(exactly = 1) { problemDao.selectProblemAnswer(any()) }
+                verify(exactly = 1) { submitHistoryDao.insertSubmitHistory(any()) }
+            }
+        }
+
+        `when`("존재하지 않는 문제일 경우") {
+            val useCaseIn = CheckProblemUseCaseIn(problemId = 1L, sub = "1")
+
+            every { problemDao.selectProblemAnswer(any()) } returns null
+
+            then("예외가 발생한다") {
+                shouldThrow<Exception> { useCase.execute(useCaseIn) }
+                verify(exactly = 1) { problemDao.selectProblemAnswer(any()) }
+            }
+        }
+    }
+})
\ No newline at end of file
diff --git a/api/src/test/kotlin/com/few/api/domain/problem/usecase/ReadProblemUseCaseTest.kt b/api/src/test/kotlin/com/few/api/domain/problem/usecase/ReadProblemUseCaseTest.kt
new file mode 100644
index 000000000..d97f6490c
--- /dev/null
+++ b/api/src/test/kotlin/com/few/api/domain/problem/usecase/ReadProblemUseCaseTest.kt
@@ -0,0 +1,59 @@
+package com.few.api.domain.problem.usecase
+
+import com.few.api.domain.problem.usecase.dto.ReadProblemUseCaseIn
+import com.few.api.repo.dao.problem.ProblemDao
+import com.few.api.repo.dao.problem.record.SelectProblemRecord
+import com.few.api.repo.dao.problem.support.Content
+import com.few.api.repo.dao.problem.support.Contents
+import com.few.api.repo.dao.problem.support.ContentsJsonMapper
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.core.spec.style.BehaviorSpec
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.verify
+
+class ReadProblemUseCaseTest : BehaviorSpec({
+
+    lateinit var problemDao: ProblemDao
+    lateinit var contentsJsonMapper: ContentsJsonMapper
+    lateinit var useCase: ReadProblemUseCase
+    val useCaseIn = ReadProblemUseCaseIn(problemId = 1L)
+
+    beforeContainer {
+        problemDao = mockk<ProblemDao>()
+        contentsJsonMapper = mockk<ContentsJsonMapper>()
+        useCase = ReadProblemUseCase(problemDao, contentsJsonMapper)
+    }
+
+    given("문제를 조회할 상황에서") {
+        `when`("문제가 존재할 경우") {
+            val problemRecord = SelectProblemRecord(id = 1L, title = "title", contents = "{}")
+            val contents = Contents(
+                listOf(
+                    Content(number = 1, content = "{}"),
+                    Content(number = 2, content = "{}")
+                )
+            )
+
+            every { problemDao.selectProblemContents(any()) } returns problemRecord
+            every { contentsJsonMapper.toObject(any()) } returns contents
+
+            then("정상적으로 실행되어야 한다") {
+                useCase.execute(useCaseIn)
+
+                verify(exactly = 1) { problemDao.selectProblemContents(any()) }
+                verify(exactly = 1) { contentsJsonMapper.toObject(any()) }
+            }
+        }
+
+        `when`("문제가 존재하지 않을 경우") {
+            every { problemDao.selectProblemContents(any()) } returns null
+
+            then("예외가 발생해야 한다") {
+                shouldThrow<Exception> { useCase.execute(useCaseIn) }
+
+                verify(exactly = 1) { problemDao.selectProblemContents(any()) }
+            }
+        }
+    }
+})
\ No newline at end of file
diff --git a/api/src/test/kotlin/com/few/api/domain/subscription/usecase/SubscribeWorkbookUseCaseTest.kt b/api/src/test/kotlin/com/few/api/domain/subscription/usecase/SubscribeWorkbookUseCaseTest.kt
new file mode 100644
index 000000000..cb781f828
--- /dev/null
+++ b/api/src/test/kotlin/com/few/api/domain/subscription/usecase/SubscribeWorkbookUseCaseTest.kt
@@ -0,0 +1,112 @@
+package com.few.api.domain.subscription.usecase
+
+import com.few.api.domain.subscription.event.dto.WorkbookSubscriptionEvent
+import com.few.api.domain.subscription.service.MemberService
+import com.few.api.domain.subscription.service.dto.MemberIdOutDto
+import com.few.api.domain.subscription.usecase.dto.SubscribeWorkbookUseCaseIn
+import com.few.api.repo.dao.subscription.SubscriptionDao
+import com.few.api.repo.dao.subscription.record.WorkbookSubscriptionStatus
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.core.spec.style.BehaviorSpec
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.verify
+import io.mockk.just
+import io.mockk.Runs
+import org.springframework.context.ApplicationEventPublisher
+
+class SubscribeWorkbookUseCaseTest : BehaviorSpec({
+
+    lateinit var subscriptionDao: SubscriptionDao
+    lateinit var memberService: MemberService
+    lateinit var applicationEventPublisher: ApplicationEventPublisher
+    lateinit var useCase: SubscribeWorkbookUseCase
+    val workbookId = 1L
+    val useCaseIn = SubscribeWorkbookUseCaseIn(workbookId = workbookId, email = "test@test.com")
+
+    beforeContainer {
+        subscriptionDao = mockk<SubscriptionDao>()
+        memberService = mockk<MemberService>()
+        applicationEventPublisher = mockk<ApplicationEventPublisher>()
+        useCase = SubscribeWorkbookUseCase(subscriptionDao, memberService, applicationEventPublisher)
+    }
+
+    given("구독 요청이 온 상황에서") {
+        `when`("subscriptionStatus가 null일 경우") {
+            val serviceOutDto = MemberIdOutDto(memberId = 1L)
+            val event = WorkbookSubscriptionEvent(workbookId)
+
+            every { memberService.readMemberId(any()) } returns null
+            every { memberService.insertMember(any()) } returns serviceOutDto
+            every { subscriptionDao.selectTopWorkbookSubscriptionStatus(any()) } returns null
+            every { subscriptionDao.insertWorkbookSubscription(any()) } just Runs
+            every { applicationEventPublisher.publishEvent(event) } answers {
+                println("Mocking applicationEventPublisher.publishEvent(any()) was called")
+            }
+
+            then("신규 구독을 추가한다") {
+                useCase.execute(useCaseIn)
+
+                verify(exactly = 1) { memberService.insertMember(any()) }
+                verify(exactly = 1) { subscriptionDao.insertWorkbookSubscription(any()) }
+                verify(exactly = 0) { subscriptionDao.countWorkbookMappedArticles(any()) }
+                verify(exactly = 0) { subscriptionDao.reSubscribeWorkbookSubscription(any()) }
+                verify(exactly = 1) { applicationEventPublisher.publishEvent(event) }
+            }
+        }
+
+        `when`("구독을 취소한 경우") {
+            val day = 2
+            val lastDay = 3
+            val serviceOutDto = MemberIdOutDto(memberId = 1L)
+            val subscriptionStatusRecord = WorkbookSubscriptionStatus(workbookId = workbookId, isActiveSub = false, day)
+            val event = WorkbookSubscriptionEvent(workbookId)
+
+            every { memberService.readMemberId(any()) } returns null
+            every { memberService.insertMember(any()) } returns serviceOutDto
+            every { subscriptionDao.selectTopWorkbookSubscriptionStatus(any()) } returns subscriptionStatusRecord
+            every { subscriptionDao.countWorkbookMappedArticles(any()) } returns lastDay
+            every { subscriptionDao.reSubscribeWorkbookSubscription(any()) } just Runs
+            every { applicationEventPublisher.publishEvent(event) } answers {
+                println("Mocking applicationEventPublisher.publishEvent(any()) was called")
+            }
+
+            then("재구독한다") {
+                useCase.execute(useCaseIn)
+
+                verify(exactly = 1) { memberService.insertMember(any()) }
+                verify(exactly = 0) { subscriptionDao.insertWorkbookSubscription(any()) }
+                verify(exactly = 1) { subscriptionDao.countWorkbookMappedArticles(any()) }
+                verify(exactly = 1) { subscriptionDao.reSubscribeWorkbookSubscription(any()) }
+                verify(exactly = 1) { applicationEventPublisher.publishEvent(event) }
+            }
+        }
+
+        `when`("이미 구독하고 있을 경우") {
+            val day = 2
+            val lastDay = 3
+            val serviceOutDto = MemberIdOutDto(memberId = 1L)
+            val subscriptionStatusRecord = WorkbookSubscriptionStatus(workbookId = workbookId, isActiveSub = true, day)
+            val event = WorkbookSubscriptionEvent(workbookId)
+
+            every { memberService.readMemberId(any()) } returns null
+            every { memberService.insertMember(any()) } returns serviceOutDto
+            every { subscriptionDao.selectTopWorkbookSubscriptionStatus(any()) } returns subscriptionStatusRecord
+            every { subscriptionDao.countWorkbookMappedArticles(any()) } returns lastDay
+            every { subscriptionDao.reSubscribeWorkbookSubscription(any()) } just Runs
+            every { applicationEventPublisher.publishEvent(event) } answers {
+                println("Mocking applicationEventPublisher.publishEvent(any()) was called")
+            }
+
+            then("예외가 발생한다") {
+                shouldThrow<Exception> { useCase.execute(useCaseIn) }
+
+                verify(exactly = 1) { memberService.insertMember(any()) }
+                verify(exactly = 0) { subscriptionDao.insertWorkbookSubscription(any()) }
+                verify(exactly = 0) { subscriptionDao.countWorkbookMappedArticles(any()) }
+                verify(exactly = 0) { subscriptionDao.reSubscribeWorkbookSubscription(any()) }
+                verify(exactly = 0) { applicationEventPublisher.publishEvent(event) }
+            }
+        }
+    }
+})
\ No newline at end of file
diff --git a/api/src/test/kotlin/com/few/api/domain/workbook/usecase/ReadWorkbookUseCaseTest.kt b/api/src/test/kotlin/com/few/api/domain/workbook/usecase/ReadWorkbookUseCaseTest.kt
new file mode 100644
index 000000000..2099903d2
--- /dev/null
+++ b/api/src/test/kotlin/com/few/api/domain/workbook/usecase/ReadWorkbookUseCaseTest.kt
@@ -0,0 +1,83 @@
+package com.few.api.domain.workbook.usecase
+
+import com.few.api.domain.workbook.service.WorkbookArticleService
+import com.few.api.domain.workbook.service.WorkbookMemberService
+import com.few.api.domain.workbook.service.dto.WorkBookArticleOutDto
+import com.few.api.domain.workbook.service.dto.WriterOutDto
+import com.few.api.domain.workbook.usecase.dto.ReadWorkbookUseCaseIn
+import com.few.api.repo.dao.workbook.WorkbookDao
+import com.few.api.repo.dao.workbook.record.SelectWorkBookRecord
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.core.spec.style.BehaviorSpec
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.verify
+
+import java.net.URL
+import java.time.LocalDateTime
+
+class ReadWorkbookUseCaseTest : BehaviorSpec({
+    lateinit var workbookDao: WorkbookDao
+    lateinit var workbookArticleService: WorkbookArticleService
+    lateinit var workbookMemberService: WorkbookMemberService
+    lateinit var useCase: ReadWorkbookUseCase
+    val useCaseIn = ReadWorkbookUseCaseIn(workbookId = 1L)
+
+    beforeContainer {
+        workbookDao = mockk<WorkbookDao>()
+        workbookArticleService = mockk<WorkbookArticleService>()
+        workbookMemberService = mockk<WorkbookMemberService>()
+        useCase = ReadWorkbookUseCase(workbookDao, workbookArticleService, workbookMemberService)
+    }
+
+    given("워크북 조회 요청이 온 상황에서") {
+        `when`("워크북과 작가가 존재할 경우") {
+            every { workbookDao.selectWorkBook(any()) } returns SelectWorkBookRecord(
+                id = 1L,
+                title = "workbook title",
+                mainImageUrl = URL("https://jh-labs.tistory.com/"),
+                category = (10).toByte(),
+                description = "workbook description",
+                createdAt = LocalDateTime.now()
+            )
+            every { workbookArticleService.browseWorkbookArticles(any()) } returns listOf(
+                WorkBookArticleOutDto(
+                    articleId = 1L,
+                    writerId = 1L,
+                    mainImageURL = URL("https://jh-labs.tistory.com/"),
+                    title = "article title",
+                    category = (10).toByte(),
+                    content = "article description",
+                    createdAt = LocalDateTime.now()
+                )
+            )
+            every { workbookMemberService.browseWriterRecords(any()) } returns listOf(
+                WriterOutDto(
+                    writerId = 1L,
+                    name = "hunca",
+                    url = URL("https://jh-labs.tistory.com/")
+                )
+            )
+
+            then("워크북 정상 조회된다") {
+                useCase.execute(useCaseIn)
+
+                verify(exactly = 1) { workbookDao.selectWorkBook(any()) }
+                verify(exactly = 1) { workbookArticleService.browseWorkbookArticles(any()) }
+                verify(exactly = 1) { workbookMemberService.browseWriterRecords(any()) }
+            }
+        }
+
+        `when`("워크북이 존재하지 않을 경우") {
+            every { workbookDao.selectWorkBook(any()) } returns null
+
+            then("예외가 발생한다") {
+                shouldThrow<Exception> { useCase.execute(useCaseIn) }
+
+                verify(exactly = 1) { workbookDao.selectWorkBook(any()) }
+                verify(exactly = 0) { workbookArticleService.browseWorkbookArticles(any()) }
+                verify(exactly = 0) { workbookMemberService.browseWriterRecords(any()) }
+            }
+        }
+    }
+})
\ No newline at end of file