diff --git a/backend/core/src/test/java/site/timecapsulearchive/core/domain/group/repository/GroupQueryRepositoryImplTest.java b/backend/core/src/test/java/site/timecapsulearchive/core/domain/group/repository/GroupQueryRepositoryImplTest.java
new file mode 100644
index 000000000..239a7c9a2
--- /dev/null
+++ b/backend/core/src/test/java/site/timecapsulearchive/core/domain/group/repository/GroupQueryRepositoryImplTest.java
@@ -0,0 +1,129 @@
+package site.timecapsulearchive.core.domain.group.repository;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import com.querydsl.jpa.impl.JPAQueryFactory;
+import jakarta.persistence.EntityManager;
+import java.util.List;
+import java.util.Optional;
+import org.assertj.core.api.SoftAssertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.TestConstructor;
+import org.springframework.test.context.TestConstructor.AutowireMode;
+import org.springframework.transaction.annotation.Transactional;
+import site.timecapsulearchive.core.common.RepositoryTest;
+import site.timecapsulearchive.core.common.fixture.domain.GroupFixture;
+import site.timecapsulearchive.core.common.fixture.domain.MemberFixture;
+import site.timecapsulearchive.core.common.fixture.domain.MemberGroupFixture;
+import site.timecapsulearchive.core.domain.group.data.dto.GroupDetailDto;
+import site.timecapsulearchive.core.domain.group.entity.Group;
+import site.timecapsulearchive.core.domain.member.entity.Member;
+import site.timecapsulearchive.core.domain.member_group.entity.MemberGroup;
+
+@TestConstructor(autowireMode = AutowireMode.ALL)
+class GroupQueryRepositoryImplTest extends RepositoryTest {
+
+    private final GroupQueryRepository groupQueryRepository;
+
+    private Long groupId;
+    private Long ownerId;
+    private Long groupMemberId;
+
+    GroupQueryRepositoryImplTest(JPAQueryFactory jpaQueryFactory) {
+        this.groupQueryRepository = new GroupQueryRepositoryImpl(jpaQueryFactory);
+    }
+
+    @Transactional
+    @BeforeEach
+    void setup(@Autowired EntityManager entityManager) {
+        Group group = GroupFixture.group();
+        entityManager.persist(group);
+        groupId = group.getId();
+
+        Member member = MemberFixture.member(1);
+        entityManager.persist(member);
+        ownerId = member.getId();
+
+        MemberGroup memberGroup = MemberGroupFixture.groupOwner(member, group);
+        entityManager.persist(memberGroup);
+
+        List<Member> members = MemberFixture.members(2, 10);
+        for (Member m : members) {
+            entityManager.persist(m);
+
+            MemberGroup mg = MemberGroupFixture.memberGroup(m, group, Boolean.FALSE);
+            entityManager.persist(mg);
+        }
+        groupMemberId = members.get(0).getId();
+    }
+
+    @Test
+    void 그룹_아이디로_그룹을_상세정보를_조회하면_그룹의_상세정보를_볼_수_있다() {
+        //given
+        //when
+        GroupDetailDto groupDetailDto = groupQueryRepository.findGroupDetailByGroupIdAndMemberId(
+                groupId, ownerId)
+            .orElseThrow();
+
+        //then
+        SoftAssertions.assertSoftly(softly -> {
+            softly.assertThat(groupDetailDto.groupName()).isNotBlank();
+            softly.assertThat(groupDetailDto.groupDescription()).isNotBlank();
+            softly.assertThat(groupDetailDto.groupProfileUrl()).isNotBlank();
+            softly.assertThat(groupDetailDto.groupProfileUrl()).isNotBlank();
+            softly.assertThat(groupDetailDto.createdAt()).isNotNull();
+            softly.assertThat(groupDetailDto.members()).isNotEmpty();
+        });
+    }
+
+    @Test
+    void 그룹_아이디로_그룹을_상세정보를_조회하면_사용자를_제외한_그룹원의_정보를_볼_수_있다() {
+        //given
+        //when
+        GroupDetailDto groupDetailDto = groupQueryRepository.findGroupDetailByGroupIdAndMemberId(
+                groupId, ownerId)
+            .orElseThrow();
+
+        //then
+        assertThat(groupDetailDto.members()).noneMatch(m -> m.memberId().equals(ownerId));
+    }
+
+    @Test
+    void 존재하지_않는_그룹_아이디로_그룹을_상세정보를_조회하면_예외가_발생한다() {
+        //given
+        Long notExistGroupId = 999L;
+
+        //when
+        Optional<GroupDetailDto> groupDetailDto = groupQueryRepository.findGroupDetailByGroupIdAndMemberId(
+            notExistGroupId, ownerId);
+
+        //then
+        assertThat(groupDetailDto).isEmpty();
+    }
+
+    @Test
+    void 그룹장이_그룹을_상세정보를_조회하면_그룹의_수정권한을_가진다() {
+        //given
+        //when
+        GroupDetailDto groupDetailDto = groupQueryRepository.findGroupDetailByGroupIdAndMemberId(
+                groupId, ownerId)
+            .orElseThrow();
+
+        //then
+        assertThat(groupDetailDto.isOwner()).isTrue();
+    }
+
+    @Test
+    void 그룹원이_그룹을_상세정보를_조회하면_그룹의_수정권한이_없다() {
+        //given
+        //when
+        GroupDetailDto groupDetailDto = groupQueryRepository.findGroupDetailByGroupIdAndMemberId(
+                groupId, groupMemberId)
+            .orElseThrow();
+
+        //then
+        assertThat(groupDetailDto.isOwner()).isFalse();
+    }
+}
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