feat: add nats experiment (#25703)

coderd/coderdtest/coderdtest.go

@@ -166,8 +166,9 @@ type Options struct {
 	// Overriding the database is heavily discouraged.
 	// It should only be used in cases where multiple Coder
 	// test instances are running against the same database.
-	Database database.Store
-	Pubsub   pubsub.Pubsub
+	Database          database.Store
+	Pubsub            pubsub.Pubsub
+	ReplicaSyncPubsub *pubsub.PGPubsub
 
 	// APIMiddleware inserts middleware before api.RootHandler, this can be
 	// useful in certain tests where you want to intercept requests before
@@ -287,6 +288,11 @@ func NewOptions(t testing.TB, options *Options) (func(http.Handler), context.Can
 	if options.Database == nil {
 		options.Database, options.Pubsub = dbtestutil.NewDB(t)
 	}
+	if options.ReplicaSyncPubsub == nil {
+		pgPubsub, ok := options.Pubsub.(*pubsub.PGPubsub)
+		require.True(t, ok, "ReplicaSyncPubsub must be a PGPubsub")
+		options.ReplicaSyncPubsub = pgPubsub
+	}
 	if options.CoordinatorResumeTokenProvider == nil {
 		options.CoordinatorResumeTokenProvider = tailnet.NewInsecureTestResumeTokenProvider()
 	}
@@ -596,6 +602,7 @@ func NewOptions(t testing.TB, options *Options) (func(http.Handler), context.Can
 			RuntimeConfig:                  runtimeManager,
 			Database:                       options.Database,
 			Pubsub:                         options.Pubsub,
+			ReplicaSyncPubsub:              options.ReplicaSyncPubsub,
 			ExternalAuthConfigs:            options.ExternalAuthConfigs,
 			UsageInserter:                  usageInserter,