implement Close() in MockPubSub

node/execution/engines/compute_execution_engine_test.go

@@ -827,6 +827,10 @@ func (m *mockPubSub) GetNetworkInfo() *protobufs.NetworkInfoResponse {
 	return &protobufs.NetworkInfoResponse{}
 }
 
+func (m *mockPubSub) Close() error {
+	return nil
+}
+
 type mockTransaction struct{}
 
 // Abort implements store.Transaction.

node/rpc/proxy_blossomsub_test.go

@@ -177,6 +177,7 @@ func (m *mockPubSub) DiscoverPeers(ctx context.Context) error      { return nil
 func (m *mockPubSub) GetNetwork() uint                             { return 0 }
 func (m *mockPubSub) IsPeerConnected(peerId []byte) bool           { return true }
 func (m *mockPubSub) Reachability() *wrapperspb.BoolValue          { return wrapperspb.Bool(true) }
+func (m *mockPubSub) Close() error                                 { return nil }
 
 // Test helper functions
 func createTestConfigs() (*config.P2PConfig, *config.EngineConfig, error) {