feat: 미션 내역 응원하기 도메인 구현

src/main/java/com/depromeet/domain/reaction/dao/ReactionRepository.java

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+package com.depromeet.domain.reaction.dao;
+
+import com.depromeet.domain.reaction.domain.Reaction;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface ReactionRepository extends JpaRepository<Reaction, Long> {}

src/main/java/com/depromeet/domain/reaction/domain/Reaction.java

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+package com.depromeet.domain.reaction.domain;
+
+import com.depromeet.domain.common.model.BaseTimeEntity;
+import com.depromeet.domain.member.domain.Member;
+import com.depromeet.domain.missionRecord.domain.MissionRecord;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.EnumType;
+import jakarta.persistence.Enumerated;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import lombok.AccessLevel;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import org.hibernate.annotations.Comment;
+
+@Getter
+@Entity
+@NoArgsConstructor(access = lombok.AccessLevel.PROTECTED)
+public class Reaction extends BaseTimeEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "reaction_id")
+    @Comment("응원하기 고유 ID")
+    private Long id;
+
+    @Enumerated(EnumType.STRING)
+    @Comment("응원하기 종류")
+    @Column(nullable = false)
+    private ReactionType type;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "member_id")
+    private Member member;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "mission_record_id")
+    private MissionRecord missionRecord;
+
+    @Builder(access = AccessLevel.PRIVATE)
+    private Reaction(ReactionType type, Member member, MissionRecord missionRecord) {
+        this.type = type;
+        this.member = member;
+        this.missionRecord = missionRecord;
+    }
+
+    public static Reaction createReaction(
+            ReactionType type, Member member, MissionRecord missionRecord) {
+        return Reaction.builder().type(type).member(member).missionRecord(missionRecord).build();
+    }
+}

src/main/java/com/depromeet/domain/reaction/domain/ReactionType.java

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+package com.depromeet.domain.reaction.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public enum ReactionType {
+    PURPLE_HEART("PURPLE_HEART"),
+    STAR("STAR"),
+    RED_HEART("RED_HEART"),
+    FIRECRACKER("FIRECRACKER"),
+    UNICORN("UNICORN"),
+    FIRE("FIRE"),
+    EYE("EYE");
+
+    private final String value;
+}

src/test/java/com/depromeet/domain/reaction/domain/ReactionTest.java

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+package com.depromeet.domain.reaction.domain;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import com.depromeet.domain.member.domain.Member;
+import com.depromeet.domain.member.domain.Profile;
+import com.depromeet.domain.mission.domain.Mission;
+import com.depromeet.domain.mission.domain.MissionCategory;
+import com.depromeet.domain.mission.domain.MissionVisibility;
+import com.depromeet.domain.missionRecord.domain.MissionRecord;
+import java.time.Duration;
+import java.time.LocalDateTime;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+class ReactionTest {
+
+    Member member;
+    Mission mission;
+    MissionRecord missionRecord;
+
+    @BeforeEach
+    void setUp() {
+        Profile profile = new Profile("testNickname", "testProfileImageUrl");
+        member = Member.createNormalMember(profile);
+
+        LocalDateTime startedAt = LocalDateTime.of(2023, 12, 1, 1, 5, 0);
+        LocalDateTime finishedAt = startedAt.plusWeeks(2);
+        mission =
+                Mission.createMission(
+                        "testMissionName",
+                        "testMissionContent",
+                        1,
+                        MissionCategory.ETC,
+                        MissionVisibility.ALL,
+                        startedAt,
+                        finishedAt,
+                        member);
+        Duration duration = Duration.between(startedAt, finishedAt);
+        missionRecord = MissionRecord.createMissionRecord(duration, startedAt, finishedAt, mission);
+    }
+
+    @Test
+    void 별_이모지_반응_테스트() {
+        // given
+        Reaction reaction = Reaction.createReaction(ReactionType.STAR, member, missionRecord);
+
+        // when
+        ReactionType type = reaction.getType();
+
+        // then
+        assertEquals(type, ReactionType.STAR);
+    }
+}