fix: 나갔던 약속에 재참여가 되지 않는 문제 개선

backend/src/main/java/com/ody/mate/domain/Mate.java

@@ -27,8 +27,8 @@
 
 @Table(uniqueConstraints = {
         @UniqueConstraint(
-                name = "uniqueMeetingAndMember",
-                columnNames = {"meeting_id", "member_id"}
+                name = "uniqueMeetingAndMemberAndDeletedAt",
+                columnNames = {"meeting_id", "member_id", "deleted_at"}
         )
 })
 @Entity

backend/src/test/java/com/ody/mate/controller/MateControllerTest.java

@@ -0,0 +1,96 @@
+package com.ody.mate.controller;
+
+import static org.junit.jupiter.api.DynamicTest.dynamicTest;
+
+import com.ody.common.BaseControllerTest;
+import com.ody.mate.dto.request.MateSaveRequestV2;
+import com.ody.meeting.domain.Meeting;
+import com.ody.member.domain.Member;
+import io.restassured.RestAssured;
+import io.restassured.http.ContentType;
+import java.time.LocalDateTime;
+import java.util.stream.Stream;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.DynamicTest;
+import org.junit.jupiter.api.TestFactory;
+import org.springframework.http.HttpHeaders;
+
+class MateControllerTest extends BaseControllerTest {
+
+    @DisplayName("동일 약속에 퇴장했다가 재참여가 가능하다")
+    @TestFactory
+    Stream<DynamicTest> canReattendMeeting() {
+        LocalDateTime fiveMinutesLater = LocalDateTime.now().plusMinutes(5L);
+        Meeting meeting = fixtureGenerator.generateMeeting(fiveMinutesLater);
+        Member member = fixtureGenerator.generateMember();
+
+        return Stream.of(
+                dynamicTest("약속에 최초 참여한다", () -> {
+                    MateSaveRequestV2 mateSaveRequestV2 = dtoGenerator.generateMateSaveRequest(meeting);
+                    RestAssured.given().log().all()
+                            .contentType(ContentType.JSON)
+                            .header(HttpHeaders.AUTHORIZATION, fixtureGenerator.generateAccessTokenValueByMember(member))
+                            .body(mateSaveRequestV2)
+                            .when()
+                            .post("/v2/mates")
+                            .then()
+                            .statusCode(201);
+                }),
+                dynamicTest("약속에서 퇴장한다", () -> {
+                    RestAssured.given().log().all()
+                            .contentType(ContentType.JSON)
+                            .header(HttpHeaders.AUTHORIZATION, fixtureGenerator.generateAccessTokenValueByMember(member))
+                            .when()
+                            .delete("/meetings/" + meeting.getId() + "/mate")
+                            .then()
+                            .statusCode(204);
+                }),
+                dynamicTest("약속에 재참여한다", () -> {
+                    MateSaveRequestV2 mateSaveRequestV2 = dtoGenerator.generateMateSaveRequest(meeting);
+                    RestAssured.given().log().all()
+                            .contentType(ContentType.JSON)
+                            .header(HttpHeaders.AUTHORIZATION, fixtureGenerator.generateAccessTokenValueByMember(member))
+                            .body(mateSaveRequestV2)
+                            .when()
+                            .post("/v2/mates")
+                            .then()
+                            .statusCode(201);
+                })
+        );
+    }
+
+    @DisplayName("약속에 참여한 상태로 재참여가 불가하다")
+    @TestFactory
+    Stream<DynamicTest> canNotReattendMeetingWithoutLeave() {
+        LocalDateTime fiveMinutesLater = LocalDateTime.now().plusMinutes(5L);
+        Meeting meeting = fixtureGenerator.generateMeeting(fiveMinutesLater);
+        Member member = fixtureGenerator.generateMember();
+
+        return Stream.of(
+                dynamicTest("약속에 최초 참여한다", () -> {
+                    MateSaveRequestV2 mateSaveRequestV2 = dtoGenerator.generateMateSaveRequest(meeting);
+                    RestAssured.given().log().all()
+                            .contentType(ContentType.JSON)
+                            .header(HttpHeaders.AUTHORIZATION,
+                                    fixtureGenerator.generateAccessTokenValueByMember(member))
+                            .body(mateSaveRequestV2)
+                            .when()
+                            .post("/v2/mates")
+                            .then()
+                            .statusCode(201);
+                }),
+                dynamicTest("동일 약속에 재참여를 시도한다", () -> {
+                    MateSaveRequestV2 mateSaveRequestV2 = dtoGenerator.generateMateSaveRequest(meeting);
+                    RestAssured.given().log().all()
+                            .contentType(ContentType.JSON)
+                            .header(HttpHeaders.AUTHORIZATION,
+                                    fixtureGenerator.generateAccessTokenValueByMember(member))
+                            .body(mateSaveRequestV2)
+                            .when()
+                            .post("/v2/mates")
+                            .then()
+                            .statusCode(400);
+                })
+        );
+    };
+}