Add test for SearchMsg function when no chatLogs in database

internal/rpc/msg/search_test.go

@@ -0,0 +1,25 @@
+package msg
+
+import (
+	"testing"
+	"github.com/OpenIMSDK/Open-IM-Server/internal/logic/service"
+	"github.com/OpenIMSDK/Open-IM-Server/pkg/pb"
+)
+
+func TestSearchMsg(t *testing.T) {
+	// Ensure that the database is empty
+	// clearDatabase()
+
+	// Call the SearchMsg function
+	req := &pb.SearchMsgReq{}
+	resp, err := service.NewMsgService().SearchMsg(context.Background(), req)
+
+	// Check that the error is nil and the response is empty
+	if err != nil {
+		t.Errorf("Expected nil error, got %v", err)
+	}
+	if resp != &pb.SearchMsgResp{} {
+		t.Errorf("Expected empty response, got %v", resp)
+	}
+}
+