[✨feat] InternshipWorkingPeriod 구현

src/main/kotlin/com/terning/server/kotlin/domain/internshipAnnouncement/InternshipErrorCode.kt

@@ -16,4 +16,5 @@ enum class InternshipErrorCode(
     INVALID_COMPANY_NAME_TOO_LONG(HttpStatus.BAD_REQUEST, "기업명은 64자 이하여야 합니다."),
     INVALID_INTERNSHIP_TITLE_EMPTY(HttpStatus.BAD_REQUEST, "인턴십 제목은 비어 있을 수 없습니다."),
     INVALID_INTERNSHIP_TITLE_TOO_LONG(HttpStatus.BAD_REQUEST, "인턴십 제목은 64자 이하여야 합니다."),
+    INVALID_WORKING_PERIOD(HttpStatus.BAD_REQUEST, "근무 기간은 1개월 이상이어야 합니다."),
 }

src/main/kotlin/com/terning/server/kotlin/domain/internshipAnnouncement/InternshipWorkingPeriod.kt

@@ -0,0 +1,32 @@
+package com.terning.server.kotlin.domain.internshipAnnouncement
+
+import jakarta.persistence.Embeddable
+
+@Embeddable
+class InternshipWorkingPeriod private constructor(
+    val months: Int,
+) {
+    init {
+        validatePositive(months)
+    }
+
+    fun toKoreanPeriod(): String = "${months}개월"
+
+    override fun equals(other: Any?): Boolean = this === other || (other is InternshipWorkingPeriod && months == other.months)
+
+    override fun hashCode(): Int = months
+
+    override fun toString(): String = toKoreanPeriod()
+
+    companion object {
+        private const val MINIMUM_MONTHS = 1
+
+        fun from(months: Int): InternshipWorkingPeriod = InternshipWorkingPeriod(months)
+
+        private fun validatePositive(months: Int) {
+            if (months < MINIMUM_MONTHS) {
+                throw InternshipException(InternshipErrorCode.INVALID_WORKING_PERIOD)
+            }
+        }
+    }
+}

src/test/kotlin/com/terning/server/kotlin/domain/internshipAnnouncement/InternshipWorkingPeriodTest.kt

@@ -0,0 +1,54 @@
+package com.terning.server.kotlin.domain.internshipAnnouncement
+
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Nested
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
+
+class InternshipWorkingPeriodTest {
+    @Nested
+    @DisplayName("InternshipWorkingPeriod.from 메서드는")
+    inner class From {
+        @Test
+        @DisplayName("유효한 개월 수를 입력하면 객체를 생성한다")
+        fun `create instance when valid months given`() {
+            // given
+            val months = 3
+
+            // when
+            val period = InternshipWorkingPeriod.from(months)
+
+            // then
+            assertThat(period.months).isEqualTo(months)
+        }
+
+        @Test
+        @DisplayName("0 이하의 개월 수를 입력하면 예외를 던진다")
+        fun `throw exception when months is zero or negative`() {
+            val exception =
+                assertThrows<InternshipException> {
+                    InternshipWorkingPeriod.from(0)
+                }
+
+            assertThat(exception.errorCode).isEqualTo(InternshipErrorCode.INVALID_WORKING_PERIOD)
+        }
+    }
+
+    @Nested
+    @DisplayName("toKoreanPeriod 메서드는")
+    inner class ToKoreanPeriod {
+        @Test
+        @DisplayName("개월 수를 'N개월' 형태의 문자열로 반환한다")
+        fun `return correct korean period string`() {
+            // given
+            val period = InternshipWorkingPeriod.from(6)
+
+            // when
+            val result = period.toKoreanPeriod()
+
+            // then
+            assertThat(result).isEqualTo("6개월")
+        }
+    }
+}