diff --git a/kotlin-oncall/docs/README.md b/kotlin-oncall/docs/README.md
index e69de29..7cbcc9d 100644
--- a/kotlin-oncall/docs/README.md
+++ b/kotlin-oncall/docs/README.md
@@ -0,0 +1,21 @@
+
+## 기능 요구사항
+- [x] 입력
+  - 비상 근무를 배정할 월과 시작 요일
+    `"${month},${day}"` 형식여야 함
+    month는 1~12, day는 월~일
+  - 평일 비상 근무 순번대로 사원 닉네임
+    `"${people1},${people2},${people3}"` 형식여야 함
+    중복된 이름 있으면 안됨
+    최대 5자
+    인원수: 5명~35명
+  - 휴일 비상 근무 순번대로 사원 닉네임
+    `"${people1},${people2},${people3}"` 형식여야 함
+    중복된 이름 있으면 안됨
+    평일 비상 근무 순번에 있는 사람들이 다 들어있어야함
+- [x] 비상 근무 순서 배정
+  - 평일, 휴일 순번에 따라 인원을 배정한다.
+  - 순번상 특정 근무자가 연속 2일 근무하게 되는 상황에는, 다음 근무자와 순서를 바꿔 편성한다.
+- [x] 출력
+  - `"5월 1일 월 준팍"` 형식으로 출력
+  - 평일이면서 법정공휴일의 경우에만 요일 뒤에 (휴일) 표기를 해야 한다.
diff --git a/kotlin-oncall/docs/how-to-solve.md b/kotlin-oncall/docs/how-to-solve.md
index 02ab1b4..360947f 100644
--- a/kotlin-oncall/docs/how-to-solve.md
+++ b/kotlin-oncall/docs/how-to-solve.md
@@ -2,4 +2,20 @@
 
 #### 1. 본인이 이해하고 구현한 내용에 기반해 '다른 근무자와 순서를 바꿔야 하는 경우'를 자신만의 예시를 들어 설명하세요. (필수)
 
+A. 평일근무를 서고 다음 날 휴일근무를 서야 할 경우
+
+    ```
+    - 평일 순번: 가,나,다,사,마,바,라
+    - 휴일 순번: 다,라,가,나,마,사,바
+    - 근무 예시: 가(월요일),나(화요일),다(수요일),라(목요일/휴일),사(금요일),다(토요일/휴일),...
+    ```
+
+B. 휴일근무를 서고 다음 날 평일근무를 서야 할 경우
+
+    ```
+    - 평일 순번: 가,나,다,라,마,바,사
+    - 휴일 순번: 라,다,가,나,마,사,바
+    - 근무 예시: 가(월요일),나(화요일),다(수요일),라(목요일/휴일),마(금요일),다(토요일/휴일),...
+    ```    
+
 #### 2. 요구 사항에서 제시한 앞의 날짜부터 순서를 변경하는 방법 외에 다른 방법이 있다면 어떤 방식이 있는지, 이 방법은 기존에 제시된 방식과 비교해 어떤 차이가 있는지 설명하세요. (선택)
diff --git a/kotlin-oncall/src/main/kotlin/oncall/Application.kt b/kotlin-oncall/src/main/kotlin/oncall/Application.kt
index 28436f5..266497e 100644
--- a/kotlin-oncall/src/main/kotlin/oncall/Application.kt
+++ b/kotlin-oncall/src/main/kotlin/oncall/Application.kt
@@ -1,5 +1,6 @@
 package oncall
 
 fun main() {
-    TODO("프로그램 구현")
+    val oncallController = OncallController()
+    oncallController.execute()
 }
diff --git a/kotlin-oncall/src/main/kotlin/oncall/OncallController.kt b/kotlin-oncall/src/main/kotlin/oncall/OncallController.kt
new file mode 100644
index 0000000..925e42e
--- /dev/null
+++ b/kotlin-oncall/src/main/kotlin/oncall/OncallController.kt
@@ -0,0 +1,18 @@
+package oncall
+
+import oncall.util.InputManager
+import oncall.util.OutputManager
+
+class OncallController(
+    private val inputManager: InputManager = InputManager(),
+    private val outputManager: OutputManager = OutputManager(),
+){
+
+    fun execute() {
+        val oncallInformationDTO = inputManager.getInput()
+
+        val workOrderService = WorkOrderService(oncallInformationDTO)
+        val workerList = workOrderService.getWorkerList()
+        outputManager.printWorkerOrder(oncallInformationDTO, workerList)
+    }
+}
diff --git a/kotlin-oncall/src/main/kotlin/oncall/WorkOrderService.kt b/kotlin-oncall/src/main/kotlin/oncall/WorkOrderService.kt
new file mode 100644
index 0000000..426d0de
--- /dev/null
+++ b/kotlin-oncall/src/main/kotlin/oncall/WorkOrderService.kt
@@ -0,0 +1,32 @@
+package oncall
+
+import oncall.data.Holiday
+import oncall.data.OncallInformationDTO
+import oncall.data.Week.Companion.isHoliday
+import oncall.data.getEndDateOfMonth
+
+class WorkOrderService(
+    private val oncallInformationDTO: OncallInformationDTO
+) {
+    private val month = oncallInformationDTO.month
+    private val endDate = getEndDateOfMonth(month)
+
+    private val size = oncallInformationDTO.holidayWorkerList.size
+    private val holidayWorker = MutableList(endDate) { i -> oncallInformationDTO.holidayWorkerList[i%size] }
+    private val weekdayWorker = MutableList(endDate) { i -> oncallInformationDTO.weekdayWorkerList[i%size] }
+
+    fun getWorkerList(): List<String> {
+        val workerList = mutableListOf<String>()
+        for (date in 1..endDate) {
+            val workers = getWorkerList(date)
+            val workerIndex = workers.indexOfFirst { workerList.isEmpty() || it != workerList.last() }
+            workerList.add(workers[workerIndex])
+            workers.removeAt(workerIndex)
+        }
+        return workerList.toList()
+    }
+
+    private fun getWorkerList(date: Int) = if (isHoliday(date)) holidayWorker else weekdayWorker
+
+    private fun isHoliday(date: Int) = Holiday.isHoliday(month, date) || oncallInformationDTO.startWeek.isHoliday(date)
+}
diff --git a/kotlin-oncall/src/main/kotlin/oncall/data/Dates.kt b/kotlin-oncall/src/main/kotlin/oncall/data/Dates.kt
new file mode 100644
index 0000000..2c6537d
--- /dev/null
+++ b/kotlin-oncall/src/main/kotlin/oncall/data/Dates.kt
@@ -0,0 +1,61 @@
+package oncall.data
+
+enum class Week(
+    val korean: String
+) {
+    MONDAY("월"),
+    TUESDAY("화"),
+    WEDNESDAY("수"),
+    THURSDAY("목"),
+    FRIDAY("금"),
+    SATURDAY("토"),
+    SUNDAY("일"),
+    ;
+
+    companion object {
+        fun get(value: String): Week? {
+            return entries.firstOrNull { it.korean == value }
+        }
+        fun Week.isHoliday(date: Int): Boolean {
+            val holidayOrdinal = (this.ordinal + date - 1)%7
+            return holidayOrdinal >= SATURDAY.ordinal
+        }
+        fun Week.getWeek(month: Int, date: Int): String {
+            val result = entries.first { it.ordinal == (this.ordinal + date - 1)%7 }.korean
+            val isHoliday = if (Holiday.isHoliday(month, date)) "(휴일)" else ""
+            return result + isHoliday
+        }
+    }
+}
+
+enum class Holiday(
+    val month: Int,
+    val date: Int,
+    val korean: String
+) {
+    NEW_YEARS_DAY(1, 1, "신정"),
+    INDEPENDENCE_MOVEMENT_DAY(3, 1, "삼일절"),
+    CHILDREN_S_DAY(5, 5, "어린이날"),
+    MEMORIAL_DAY(6, 6, "현충일"),
+    LIBERATION_DAY(8, 15, "광복절"),
+    NATIONAL_FOUNDATION_DAY(10, 3, "개천절"),
+    HANGUL_DAY(10, 9, "한글날"),
+    CHRISTMAS(12, 25, "성탄절"),
+    ;
+
+    companion object {
+        fun isHoliday(month: Int, date: Int): Boolean {
+            return entries.any { holiday ->
+                holiday.month == month && holiday.date == date
+            }
+        }
+    }
+}
+
+fun getEndDateOfMonth(month: Int): Int {
+    if (month !in 1..12) {
+        throw IllegalArgumentException()
+    }
+    val daysOfMonth = listOf(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)
+    return daysOfMonth[month-1]
+}
diff --git a/kotlin-oncall/src/main/kotlin/oncall/data/OncallInformationDTO.kt b/kotlin-oncall/src/main/kotlin/oncall/data/OncallInformationDTO.kt
new file mode 100644
index 0000000..ac050d2
--- /dev/null
+++ b/kotlin-oncall/src/main/kotlin/oncall/data/OncallInformationDTO.kt
@@ -0,0 +1,8 @@
+package oncall.data
+
+data class OncallInformationDTO(
+    val month: Int,
+    val startWeek: Week,
+    val weekdayWorkerList: List<String>,
+    val holidayWorkerList: List<String>
+)
diff --git a/kotlin-oncall/src/main/kotlin/oncall/util/DataConverter.kt b/kotlin-oncall/src/main/kotlin/oncall/util/DataConverter.kt
new file mode 100644
index 0000000..df96f53
--- /dev/null
+++ b/kotlin-oncall/src/main/kotlin/oncall/util/DataConverter.kt
@@ -0,0 +1,34 @@
+package oncall.util
+
+import oncall.data.Week
+
+
+class DataConverter(
+    private val validationChecker: ValidationChecker = ValidationChecker()
+) {
+
+    fun convertDate(input: String): Pair<Int, Week> {
+        val split = input.split(',')
+        val month = split[0].toIntWithoutNull()
+        val week = Week.get(split[1])
+
+        validationChecker.checkDate(split.size, month, week)
+        return Pair(month, week!!)
+    }
+
+    fun convertWeekdayWorker(input: String): List<String> {
+        val weekdayWorker = input.split(',')
+        validationChecker.checkWeekdayWorker(weekdayWorker)
+        return weekdayWorker
+    }
+
+    fun convertHolidayWorker(input: String, weekdayWorker: List<String>): List<String> {
+        val holidayWorker = input.split(',')
+        validationChecker.checkHolidayWorker(weekdayWorker, holidayWorker)
+        return holidayWorker
+    }
+
+    private fun String.toIntWithoutNull(): Int {
+        return this.toIntOrNull() ?: throw IllegalArgumentException()
+    }
+}
diff --git a/kotlin-oncall/src/main/kotlin/oncall/util/InputManager.kt b/kotlin-oncall/src/main/kotlin/oncall/util/InputManager.kt
new file mode 100644
index 0000000..0b4c012
--- /dev/null
+++ b/kotlin-oncall/src/main/kotlin/oncall/util/InputManager.kt
@@ -0,0 +1,53 @@
+package oncall.util
+
+import camp.nextstep.edu.missionutils.Console
+import oncall.data.OncallInformationDTO
+import oncall.data.Week
+
+class InputManager(
+    private val dataConverter: DataConverter = DataConverter(),
+    private val outputManager: OutputManager = OutputManager()
+) {
+
+    fun getInput(): OncallInformationDTO {
+        val (month, startWeek) = getDate()
+        val weekdayWorker = getWeekdayWorker()
+        val holidayWorker = getHolidayWorker(weekdayWorker)
+
+        return OncallInformationDTO(month, startWeek, weekdayWorker, holidayWorker)
+    }
+
+    private fun getDate(): Pair<Int, Week> {
+        return getUserInput {
+            outputManager.printGetDateMessage()
+            val input = Console.readLine() ?: ""
+            dataConverter.convertDate(input)
+        }
+    }
+
+    private fun getWeekdayWorker(): List<String> {
+        return getUserInput {
+            outputManager.printGetWeekdayWorkerMessage()
+            val input = Console.readLine() ?: ""
+            dataConverter.convertWeekdayWorker(input)
+        }
+    }
+
+    private fun getHolidayWorker(weekdayWorker: List<String>): List<String> {
+        return getUserInput {
+            outputManager.printGetHolidayWorkerMessage()
+            val input = Console.readLine() ?: ""
+            dataConverter.convertHolidayWorker(input, weekdayWorker)
+        }
+    }
+
+    private fun <T> getUserInput(inputFunction: () -> T): T {
+        while (true) {
+            try {
+                return inputFunction()
+            } catch (_: IllegalArgumentException) {
+                outputManager.printExceptionMessage()
+            }
+        }
+    }
+}
diff --git a/kotlin-oncall/src/main/kotlin/oncall/util/OutputManager.kt b/kotlin-oncall/src/main/kotlin/oncall/util/OutputManager.kt
new file mode 100644
index 0000000..feca5ba
--- /dev/null
+++ b/kotlin-oncall/src/main/kotlin/oncall/util/OutputManager.kt
@@ -0,0 +1,29 @@
+package oncall.util
+
+import oncall.data.OncallInformationDTO
+import oncall.data.Week.Companion.getWeek
+import oncall.data.getEndDateOfMonth
+
+class OutputManager {
+
+    fun printExceptionMessage() = println("$ERROR_PREFIX 유효하지 않은 입력 값입니다. 다시 입력해 주세요.")
+
+    fun printGetDateMessage() = print("비상 근무를 배정할 월과 시작 요일을 입력하세요> ")
+
+    fun printGetWeekdayWorkerMessage() = print("평일 비상 근무 순번대로 사원 닉네임을 입력하세요> ")
+
+    fun printGetHolidayWorkerMessage() = print("휴일 비상 근무 순번대로 사원 닉네임을 입력하세요> ")
+
+    fun printWorkerOrder(oncallInformationDTO: OncallInformationDTO, workerList: List<String>) {
+        val month = oncallInformationDTO.month
+        val endDate = getEndDateOfMonth(month)
+        for (date in 1..endDate) {
+            val week = oncallInformationDTO.startWeek.getWeek(month, date)
+            print("${month}월 ${date}일 $week ${workerList[date-1]}\n")
+        }
+    }
+
+    companion object {
+        private const val ERROR_PREFIX = "[ERROR]"
+    }
+}
diff --git a/kotlin-oncall/src/main/kotlin/oncall/util/ValidationChecker.kt b/kotlin-oncall/src/main/kotlin/oncall/util/ValidationChecker.kt
new file mode 100644
index 0000000..730c37d
--- /dev/null
+++ b/kotlin-oncall/src/main/kotlin/oncall/util/ValidationChecker.kt
@@ -0,0 +1,33 @@
+package oncall.util
+
+import oncall.data.Week
+
+class ValidationChecker {
+
+    fun checkDate(size: Int, month: Int, week: Week?) {
+        require(size == 2)
+        require(month in MONTH_RANGE)
+        require(week != null)
+    }
+
+    fun checkWeekdayWorker(worker: List<String>) {
+        checkWorker(worker)
+    }
+
+    fun checkHolidayWorker(weekdayWorker: List<String>, holidayWorker: List<String>) {
+        checkWorker(holidayWorker)
+        require(weekdayWorker.sorted() == holidayWorker.sorted())
+    }
+
+    private fun checkWorker(worker: List<String>) {
+        require(worker.distinct().size == worker.size)
+        require(worker.all { it.length in NICKNAME_RANGE })
+        require(worker.size in WORKER_RANGE)
+    }
+
+    companion object {
+        private val MONTH_RANGE = 1..12
+        private val NICKNAME_RANGE = 1..5
+        private val WORKER_RANGE = 5..35
+    }
+}
diff --git a/kotlin-oncall/src/test/kotlin/oncall/WorkOrderServiceTest.kt b/kotlin-oncall/src/test/kotlin/oncall/WorkOrderServiceTest.kt
new file mode 100644
index 0000000..4b81c4f
--- /dev/null
+++ b/kotlin-oncall/src/test/kotlin/oncall/WorkOrderServiceTest.kt
@@ -0,0 +1,24 @@
+package oncall
+
+import oncall.data.OncallInformationDTO
+import oncall.data.Week
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+
+class WorkOrderServiceTest {
+
+    @Test
+    fun `근무자 순서 정하기` () {
+        val weekdayWorker = listOf("준팍","도밥","고니","수아","루루","글로","솔로스타","우코","슬링키","참새","도리")
+        val holidayWorker = listOf("수아","루루","글로","솔로스타","우코","슬링키","참새","도리","준팍","도밥","고니")
+
+        val oncallInformationDTO = OncallInformationDTO(5, Week.MONDAY, weekdayWorker, holidayWorker)
+        val result = WorkOrderService(oncallInformationDTO).getWorkerList()
+        val expected = listOf("준팍", "도밥", "고니", "수아", "루루", "수아", "글로", "루루", "글로")
+
+        for (index in expected.indices) {
+            assertEquals(expected[index], result[index])
+        }
+    }
+
+}
diff --git a/kotlin-oncall/src/test/kotlin/oncall/util/DataConverterTest.kt b/kotlin-oncall/src/test/kotlin/oncall/util/DataConverterTest.kt
new file mode 100644
index 0000000..da8828c
--- /dev/null
+++ b/kotlin-oncall/src/test/kotlin/oncall/util/DataConverterTest.kt
@@ -0,0 +1,45 @@
+package oncall.util
+
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
+
+class DataConverterTest {
+
+    private val dataConverter = DataConverter()
+
+    @Test
+    fun `배정 월, 시작요일 입력 성공`() {
+        val input = "1,월"
+        val (month, week) = dataConverter.convertDate(input)
+
+        assertEquals(1, month)
+        assertEquals("월", week)
+    }
+
+    @Test
+    fun `배정 월, 시작요일 입력 실패`() {
+        assertThrows<IllegalArgumentException> {
+            val input = "asdf,월"
+            val (month, week) = dataConverter.convertDate(input)
+        }
+    }
+
+    @Test
+    fun `평일 근무자 입력 성공`() {
+        val input = "a,b,c,d,e"
+        val worker = dataConverter.convertWeekdayWorker(input)
+
+        assertEquals(worker, listOf("a", "b", "c", "d", "e"))
+    }
+
+    @Test
+    fun `휴일 근무자 입력 성공`() {
+        val weekdayWorker = listOf("가","나","다","라","마","바")
+        val holidayWorker = "바,마,라,다,나,가"
+        val worker = dataConverter.convertHolidayWorker(holidayWorker, weekdayWorker)
+
+        assertEquals(worker, listOf("바", "마", "라", "다", "나", "가"))
+    }
+
+}
diff --git a/kotlin-oncall/src/test/kotlin/oncall/util/ValidationTest.kt b/kotlin-oncall/src/test/kotlin/oncall/util/ValidationTest.kt
new file mode 100644
index 0000000..87bd83d
--- /dev/null
+++ b/kotlin-oncall/src/test/kotlin/oncall/util/ValidationTest.kt
@@ -0,0 +1,165 @@
+package oncall.util
+
+import oncall.data.Week
+import org.assertj.core.api.Assertions.assertThatNoException
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
+
+class ValidationTest {
+
+    private val validationChecker = ValidationChecker()
+
+    // ----------------배정 월, 시작요일 유효성 체크----------------
+
+    @Test
+    fun `배정 월, 시작요일 유효성 체크 성공`() {
+        val size = 2
+        val month = 1
+        val week = Week.MONDAY
+        validationChecker.checkDate(size, month, week)
+        assertThatNoException()
+    }
+
+    @Test
+    fun `배정 월, 시작요일 유효성 체크 실패 - 사이즈 문제`() {
+        assertThrows<IllegalArgumentException> {
+            val size = 3
+            val month = 1
+            val week = Week.MONDAY
+            validationChecker.checkDate(size, month, week)
+        }
+    }
+
+    @Test
+    fun `배정 월, 시작요일 유효성 체크 실패 - 배정 달 문제`() {
+        assertThrows<IllegalArgumentException> {
+            val size = 2
+            val month = 0
+            val week = Week.MONDAY
+            validationChecker.checkDate(size, month, week)
+        }
+    }
+
+    // ----------------평일 근무자 유효성 체크----------------
+
+    @Test
+    fun `평일 근무자 유효성 체크 성공`() {
+        val input = listOf("가","나","다","라","마","바")
+        validationChecker.checkWeekdayWorker(input)
+        assertThatNoException()
+    }
+
+    @Test
+    fun `평일 근무자 유효성 체크 실패 - 중복된 닉네임`() {
+        assertThrows<IllegalArgumentException> {
+            val input = listOf("가", "나", "다", "라", "마", "바", "바")
+            validationChecker.checkWeekdayWorker(input)
+        }
+    }
+
+    @Test
+    fun `평일 근무자 유효성 체크 실패 - 닉네임 빈 문자열 존재`() {
+        assertThrows<IllegalArgumentException> {
+            val input = listOf("가", "", "다", "라", "마", "바", "바")
+            validationChecker.checkWeekdayWorker(input)
+        }
+    }
+
+    @Test
+    fun `평일 근무자 유효성 체크 실패 - 닉네임 길이 너무 긺`() {
+        assertThrows<IllegalArgumentException> {
+            val input = listOf("가", "나", "다", "라면먹고싶다", "마", "바", "바")
+            validationChecker.checkWeekdayWorker(input)
+        }
+    }
+
+    @Test
+    fun `평일 근무자 유효성 체크 실패 - 근무자수 너무 작음`() {
+        assertThrows<IllegalArgumentException> {
+            val input = List(2) { i -> "${i}인간" }
+            validationChecker.checkWeekdayWorker(input)
+        }
+    }
+
+    @Test
+    fun `평일 근무자 유효성 체크 실패 - 근무자수 너무 많음`() {
+        assertThrows<IllegalArgumentException> {
+            val input = List(100) { i -> "${i}인간" }
+            validationChecker.checkWeekdayWorker(input)
+        }
+    }
+
+    // ----------------휴일 근무자 유효성 체크----------------
+
+    @Test
+    fun `휴일 근무자 유효성 체크 성공`() {
+        val weekdayWorker = listOf("가","나","다","라","마","바")
+        val holidayWorker = listOf("바","마","라","다","나","가")
+        validationChecker.checkHolidayWorker(weekdayWorker, holidayWorker)
+        assertThatNoException()
+    }
+
+    @Test
+    fun `휴일 근무자 유효성 체크 실패 - 중복된 닉네임`() {
+        assertThrows<IllegalArgumentException> {
+            val weekdayWorker = listOf("가", "나", "다", "라", "마", "바")
+            val holidayWorker = listOf("바", "마", "라", "나", "가", "가")
+            validationChecker.checkHolidayWorker(weekdayWorker, holidayWorker)
+        }
+    }
+
+    @Test
+    fun `휴일 근무자 유효성 체크 실패 - 닉네임 빈 문자열 존재`() {
+        assertThrows<IllegalArgumentException> {
+            val weekdayWorker = listOf("가", "나", "다", "라", "마", "바")
+            val holidayWorker = listOf("바", "마", "라", "다", "나", "")
+            validationChecker.checkHolidayWorker(weekdayWorker, holidayWorker)
+        }
+    }
+
+    @Test
+    fun `휴일 근무자 유효성 체크 실패 - 닉네임 길이 너무 긺`() {
+        assertThrows<IllegalArgumentException> {
+            val weekdayWorker = listOf("가", "나", "다", "라", "마", "바")
+            val holidayWorker = listOf("바지지퍼열렸어요", "마", "라", "다", "나", "가", "가")
+            validationChecker.checkHolidayWorker(weekdayWorker, holidayWorker)
+        }
+    }
+
+    @Test
+    fun `휴일 근무자 유효성 체크 실패 - 근무자수 너무 작음`() {
+        assertThrows<IllegalArgumentException> {
+            val weekdayWorker = List(2) { i -> "${i}인간" }
+            val holidayWorker = List(2) { i -> "${i}인간" }
+            validationChecker.checkHolidayWorker(weekdayWorker, holidayWorker)
+        }
+    }
+
+    @Test
+    fun `휴일 근무자 유효성 체크 실패 - 근무자수 너무 많음`() {
+        assertThrows<IllegalArgumentException> {
+            val weekdayWorker = List(50) { i -> "${i}인간" }
+            val holidayWorker = List(50) { i -> "${i}인간" }
+            validationChecker.checkHolidayWorker(weekdayWorker, holidayWorker)
+        }
+    }
+
+    @Test
+    fun `휴일 근무자 유효성 체크 실패 - 평일 근무자랑 휴일 근무자 다름`() {
+        assertThrows<IllegalArgumentException> {
+            val weekdayWorker = listOf("가", "나", "다", "라", "마", "바")
+            val holidayWorker = listOf("가구", "나락", "다람쥐", "라면", "마늘", "바질")
+            validationChecker.checkHolidayWorker(weekdayWorker, holidayWorker)
+        }
+    }
+
+    @Test
+    fun `휴일 근무자 유효성 체크 실패 - 평일 근무자랑 휴일 근무자 인원수 다름`() {
+        assertThrows<IllegalArgumentException> {
+            val weekdayWorker = listOf("가", "나", "다", "라", "마", "바")
+            val holidayWorker = listOf("가", "나", "다", "라", "마", "바", "사")
+            validationChecker.checkHolidayWorker(weekdayWorker, holidayWorker)
+        }
+    }
+
+}
diff --git a/kotlin-oncall/src/test/kotlin/oncall/util/WeekTest.kt b/kotlin-oncall/src/test/kotlin/oncall/util/WeekTest.kt
new file mode 100644
index 0000000..89c8d55
--- /dev/null
+++ b/kotlin-oncall/src/test/kotlin/oncall/util/WeekTest.kt
@@ -0,0 +1,72 @@
+package oncall.util
+
+import oncall.data.Week
+import oncall.data.Week.Companion.getWeek
+import oncall.data.Week.Companion.isHoliday
+import org.junit.jupiter.api.Assertions.*
+import org.junit.jupiter.api.Test
+
+class WeekTest {
+
+    @Test
+    fun `isHoliday - 시작 요일 월`() {
+        val startWeek = Week.MONDAY
+
+        assertFalse(startWeek.isHoliday(1))
+        assertFalse(startWeek.isHoliday(2))
+        assertFalse(startWeek.isHoliday(3))
+        assertFalse(startWeek.isHoliday(4))
+        assertFalse(startWeek.isHoliday(5))
+        assertTrue(startWeek.isHoliday(6))
+        assertTrue(startWeek.isHoliday(7))
+        assertFalse(startWeek.isHoliday(8))
+    }
+
+    @Test
+    fun `isHoliday - 시작 요일 일`() {
+        val startWeek = Week.SUNDAY
+
+        assertTrue(startWeek.isHoliday(1))
+        assertFalse(startWeek.isHoliday(2))
+        assertFalse(startWeek.isHoliday(3))
+        assertFalse(startWeek.isHoliday(4))
+        assertFalse(startWeek.isHoliday(5))
+        assertFalse(startWeek.isHoliday(6))
+        assertTrue(startWeek.isHoliday(7))
+        assertTrue(startWeek.isHoliday(8))
+    }
+
+    @Test
+    fun `isHoliday - 시작 요일 금`() {
+        val startWeek = Week.FRIDAY
+
+        assertFalse(startWeek.isHoliday(1))
+        assertTrue(startWeek.isHoliday(2))
+        assertTrue(startWeek.isHoliday(3))
+        assertFalse(startWeek.isHoliday(4))
+        assertFalse(startWeek.isHoliday(5))
+        assertFalse(startWeek.isHoliday(6))
+        assertFalse(startWeek.isHoliday(7))
+        assertFalse(startWeek.isHoliday(8))
+    }
+
+    @Test
+    fun `getWeek - 요일`() {
+        val startWeek = Week.MONDAY
+        val month = 4
+        val weekList = listOf("월", "화", "수", "목", "금", "토", "일", "월")
+        for (date in 1..8) {
+            val result = startWeek.getWeek(month, date)
+            assertEquals(weekList[date-1], result)
+        }
+    }
+
+    @Test
+    fun `getWeek - 휴일`() {
+        val startWeek = Week.SUNDAY
+        val month = 5
+        val date = 5
+        val result = startWeek.getWeek(month, date)
+        assertEquals("목(휴일)", result)
+    }
+}