diff --git a/test/store/memo_relation_test.go b/test/store/memo_relation_test.go
index 6c5ed77b1..55b189dcf 100644
--- a/test/store/memo_relation_test.go
+++ b/test/store/memo_relation_test.go
@@ -16,40 +16,74 @@ func TestMemoRelationStore(t *testing.T) {
 	require.NoError(t, err)
 	memoCreate := &store.Memo{
 		CreatorID:  user.ID,
-		Content:    "test_content",
+		Content:    "main memo content",
 		Visibility: store.Public,
 	}
 	memo, err := ts.CreateMemo(ctx, memoCreate)
 	require.NoError(t, err)
 	require.Equal(t, memoCreate.Content, memo.Content)
-	memo2Create := &store.Memo{
+	relatedMemoCreate := &store.Memo{
 		CreatorID:  user.ID,
-		Content:    "test_content_2",
+		Content:    "related memo content",
 		Visibility: store.Public,
 	}
-	memo2, err := ts.CreateMemo(ctx, memo2Create)
+	relatedMemo, err := ts.CreateMemo(ctx, relatedMemoCreate)
 	require.NoError(t, err)
-	require.Equal(t, memo2Create.Content, memo2.Content)
-	memoRelationMessage := &store.MemoRelation{
+	require.Equal(t, relatedMemoCreate.Content, relatedMemo.Content)
+	commentMemoCreate := &store.Memo{
+		CreatorID:  user.ID,
+		Content:    "comment memo content",
+		Visibility: store.Public,
+	}
+	commentMemo, err := ts.CreateMemo(ctx, commentMemoCreate)
+	require.NoError(t, err)
+	require.Equal(t, commentMemoCreate.Content, commentMemo.Content)
+
+	// Reference relation.
+	referenceRelation := &store.MemoRelation{
 		MemoID:        memo.ID,
-		RelatedMemoID: memo2.ID,
+		RelatedMemoID: relatedMemo.ID,
 		Type:          store.MemoRelationReference,
 	}
-	_, err = ts.UpsertMemoRelation(ctx, memoRelationMessage)
+	_, err = ts.UpsertMemoRelation(ctx, referenceRelation)
 	require.NoError(t, err)
-	memoRelation, err := ts.ListMemoRelations(ctx, &store.FindMemoRelation{
-		MemoID: &memo.ID,
+	// Comment relation.
+	commentRelation := &store.MemoRelation{
+		MemoID:        memo.ID,
+		RelatedMemoID: commentMemo.ID,
+		Type:          store.MemoRelationComment,
+	}
+	_, err = ts.UpsertMemoRelation(ctx, commentRelation)
+	require.NoError(t, err)
+
+	memo, err = ts.GetMemo(ctx, &store.FindMemo{
+		ID: &memo.ID,
+	})
+	require.NoError(t, err)
+	require.Equal(t, 2, len(memo.RelationList))
+	require.Equal(t, referenceRelation, memo.RelationList[0])
+	require.Equal(t, commentRelation, memo.RelationList[1])
+	relatedMemo, err = ts.GetMemo(ctx, &store.FindMemo{
+		ID: &relatedMemo.ID,
+	})
+	require.NoError(t, err)
+	require.Equal(t, 1, len(relatedMemo.RelationList))
+	require.Equal(t, referenceRelation, relatedMemo.RelationList[0])
+	commentMemo, err = ts.GetMemo(ctx, &store.FindMemo{
+		ID: &commentMemo.ID,
 	})
 	require.NoError(t, err)
-	require.Equal(t, 1, len(memoRelation))
-	require.Equal(t, memo2.ID, memoRelation[0].RelatedMemoID)
-	require.Equal(t, memo.ID, memoRelation[0].MemoID)
-	require.Equal(t, store.MemoRelationReference, memoRelation[0].Type)
+	require.Equal(t, 1, len(commentMemo.RelationList))
+	require.Equal(t, commentRelation, commentMemo.RelationList[0])
 	err = ts.DeleteMemo(ctx, &store.DeleteMemo{
-		ID: memo2.ID,
+		ID: relatedMemo.ID,
 	})
 	require.NoError(t, err)
-	memoRelation, err = ts.ListMemoRelations(ctx, &store.FindMemoRelation{
+	err = ts.DeleteMemo(ctx, &store.DeleteMemo{
+		ID: commentMemo.ID,
+	})
+	require.NoError(t, err)
+	memoRelation, err := ts.ListMemoRelations(ctx, &store.FindMemoRelation{
 		MemoID: &memo.ID,
 	})
 	require.NoError(t, err)
diff --git a/test/store/memo_test.go b/test/store/memo_test.go
index dd6454e90..95931b639 100644
--- a/test/store/memo_test.go
+++ b/test/store/memo_test.go
@@ -44,4 +44,9 @@ func TestMemoStore(t *testing.T) {
 		ID: memo.ID,
 	})
 	require.NoError(t, err)
+	memoList, err = ts.ListMemos(ctx, &store.FindMemo{
+		CreatorID: &user.ID,
+	})
+	require.NoError(t, err)
+	require.Equal(t, 0, len(memoList))
 }