Fix integration test - register actual MsgServer implementation

Co-authored-by: michaelfig <457244+michaelfig@users.noreply.github.com>

Author: Copilot

golang/cosmos/tests/integrations/vbank/vbank_test.go

@@ -32,6 +32,7 @@ import (
 
 	"github.com/Agoric/agoric-sdk/golang/cosmos/x/swingset"
 	"github.com/Agoric/agoric-sdk/golang/cosmos/x/vbank"
+	"github.com/Agoric/agoric-sdk/golang/cosmos/x/vbank/keeper"
 	vbanktypes "github.com/Agoric/agoric-sdk/golang/cosmos/x/vbank/types"
 
 	vstorage "github.com/Agoric/agoric-sdk/golang/cosmos/x/vstorage"
@@ -206,7 +207,7 @@ func initVbankFixtures(t *testing.T) VbankFixtures {
 	sdkCtx := sdk.UnwrapSDKContext(integrationApp.Context())
 
 	// Register message and query servers
-	vbanktypes.RegisterMsgServer(integrationApp.MsgServiceRouter(), vbanktypes.UnimplementedMsgServer{})
+	vbanktypes.RegisterMsgServer(integrationApp.MsgServiceRouter(), keeper.NewMsgServerImpl(vbankKeeper))
 	vbanktypes.RegisterQueryServer(integrationApp.QueryHelper(), &vbanktypes.UnimplementedQueryServer{})
 
 	return VbankFixtures{