fix e2e cases when cluster not found

Author: Colvin-Y

providers/kubeconfig/provider_test.go

@@ -43,6 +43,7 @@ import (
 
 	mcbuilder "sigs.k8s.io/multicluster-runtime/pkg/builder"
 	mcmanager "sigs.k8s.io/multicluster-runtime/pkg/manager"
+	mcluster "sigs.k8s.io/multicluster-runtime/pkg/multicluster"
 	mcreconcile "sigs.k8s.io/multicluster-runtime/pkg/reconcile"
 
 	. "github.com/onsi/ginkgo/v2"
@@ -445,7 +446,7 @@ var _ = Describe("Provider race condition", func() {
 				case 1:
 					// Concurrently get a cluster.
 					_, err := p.Get(context.Background(), "cluster-1")
-					Expect(err).To(Or(BeNil(), MatchError("cluster cluster-1 not found")))
+					Expect(err).To(Or(BeNil(), MatchError(mcluster.ErrClusterNotFound)))
 				case 2:
 					// Concurrently list clusters.
 					p.ListClusters()