diff --git a/client_test.go b/client_test.go
index 3d93234..a4feb64 100644
--- a/client_test.go
+++ b/client_test.go
@@ -529,7 +529,7 @@ func TestClient_GetBusinessDays(t *testing.T) {
 	}{
 		"Normal case":    {endpoint: srv.URL, token: "opencollector", ctx: context.Background(), giveTime: time.UnixMilli(1672498800000), checkAsError: false, wantError: nil, wantResult: true},
 		"Empty case":     {endpoint: srv.URL, token: "opencollector", ctx: context.Background(), giveTime: time.Time{}, checkAsError: true, wantError: kenall.ErrInvalidArgument, wantResult: false},
-		"Wrong response": {endpoint: srv.URL, token: "opencollector", ctx: context.Background(), giveTime: time.Time{}.Add(time.Hour), checkAsError: true, wantError: &json.MarshalerError{}, wantResult: false},
+		"Wrong response": {endpoint: srv.URL, token: "opencollector", ctx: context.Background(), giveTime: time.Time{}.Add(24 * time.Hour), checkAsError: true, wantError: &json.MarshalerError{}, wantResult: false},
 		"nil context":    {endpoint: srv.URL, token: "opencollector", ctx: nil, giveTime: time.Now(), checkAsError: true, wantError: &url.Error{}, wantResult: false},
 	}
 
@@ -925,6 +925,10 @@ func handleBusinessDaysAPI(t *testing.T, w http.ResponseWriter, uri string) {
 		if _, err := w.Write(businessDaysResponse); err != nil {
 			w.WriteHeader(http.StatusInternalServerError)
 		}
+	case "/businessdays/check?date=0001-01-02":
+		if _, err := w.Write([]byte(`{"result": "worng"}`)); err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+		}
 	default:
 		w.WriteHeader(http.StatusNotFound)
 	}