diff --git a/Domain-Module/src/test/kotlin/com/bamyanggang/domainmodule/domain/tag/service/TagReaderTest.kt b/Domain-Module/src/test/kotlin/com/bamyanggang/domainmodule/domain/tag/service/TagReaderTest.kt
new file mode 100644
index 00000000..79ccfde8
--- /dev/null
+++ b/Domain-Module/src/test/kotlin/com/bamyanggang/domainmodule/domain/tag/service/TagReaderTest.kt
@@ -0,0 +1,101 @@
+package com.bamyanggang.domainmodule.domain.tag.service
+
+import com.bamyanggang.domainmodule.domain.tag.repository.TagRepository
+import io.kotest.core.spec.style.BehaviorSpec
+import io.mockk.mockk
+import io.mockk.verify
+import java.util.*
+
+class TagReaderTest : BehaviorSpec({
+    val mockTagRepository = mockk<TagRepository>(relaxed = true)
+    val tagReader = TagReader(mockTagRepository)
+
+    Given("tagId가 주어졌을 때") {
+        val tagId = UUID.randomUUID()
+
+        When("tagReader.readById가 호출되면") {
+            tagReader.readById(tagId)
+
+            Then("tagRepository.findById가 호촐된다.") {
+                verify { mockTagRepository.findById(tagId) }
+            }
+        }
+    }
+
+    Given("tagId 배열이 주어졌을 때") {
+        val tagIds = arrayListOf(
+            UUID.randomUUID(),
+            UUID.randomUUID()
+        )
+
+        When("tagReader.readByParentTagIds가 호출되면") {
+            tagReader.readByParentTagIds(tagIds)
+
+            Then("tagRepository.findByParentTagIds 호촐된다.") {
+                verify { mockTagRepository.findByParentTagIds(tagIds) }
+            }
+        }
+    }
+
+    Given("userId가 주어졌을 때") {
+        val userId = UUID.randomUUID()
+
+        When("tagReader.readAllParentTagsByUserId 호출되면") {
+            tagReader.readAllParentTagsByUserId(userId)
+
+            Then("tagRepository.findAllParentTagsByUserId 호촐된다.") {
+                verify { mockTagRepository.findAllParentTagsByUserId(userId) }
+            }
+        }
+    }
+
+    Given("userId, parentTagId가 주어졌을 때") {
+        val userId = UUID.randomUUID()
+        val parentTagId = UUID.randomUUID()
+        When("tagReader.readAllChildTagsByUserIdAndParentTagId 호출되면") {
+            tagReader.readAllChildTagsByUserIdAndParentTagId(
+                userId = userId,
+                parentTagId = parentTagId
+            )
+
+            Then("tagRepository.findAllChildTagsByUserIdAndParentTagId 호촐된다.") {
+                verify { mockTagRepository.findAllChildTagsByUserIdAndParentTagId(
+                    userId = userId,
+                    parentTagId = parentTagId
+                ) }
+            }
+        }
+    }
+
+    Given("userId, search 검색 문자열이 주어졌을 때") {
+        val userId = UUID.randomUUID()
+        val search = "태그 이름 검색 문자열"
+        When("tagReader.readIdsByUserIdAndNameContains 호출되면") {
+            tagReader.readIdsByUserIdAndNameContains(
+                userId = userId,
+                search = search
+            )
+
+            Then("tagRepository.findAllChildTagsByUserIdAndParentTagId 호촐된다.") {
+                verify { mockTagRepository.findByUserIdAndNameContains(
+                    userId = userId,
+                    search = search
+                ) }
+            }
+        }
+    }
+
+    Given("parentTagId가 주어졌을 때") {
+        val parentTagId = UUID.randomUUID()
+
+        When("tagReader.readChildTagsByParentTagId 호출되면") {
+            tagReader.readChildTagsByParentTagId(parentTagId = parentTagId)
+
+            Then("tagRepository.findAllChildTagsByParentTagId 호촐된다.") {
+                verify { mockTagRepository.findAllChildTagsByParentTagId(
+                    parentTagId = parentTagId,
+                ) }
+            }
+        }
+    }
+})