[tmpnet] Minimize duration of tx acceptance for e2e testing

- Enable configuration of min block delay for primary subnet with
  the addition of node flag `--proposer-min-block-delay`
- Configure tmpnet to default the block delay to zero for all subnets
- Reduce the wallet poll interval from 100ms to 10ms
- Remove unnecessary sleep in virtuous test

config/config.go

@@ -1132,7 +1132,7 @@ func getDefaultSubnetConfig(v *viper.Viper) subnets.Config {
 	return subnets.Config{
 		ConsensusParameters:         getConsensusConfig(v),
 		ValidatorOnly:               false,
-		ProposerMinBlockDelay:       proposervm.DefaultMinBlockDelay,
+		ProposerMinBlockDelay:       v.GetDuration(ProposerMinBlockDelayKey),
 		ProposerNumHistoricalBlocks: proposervm.DefaultNumHistoricalBlocks,
 	}
 }

config/flags.go

@@ -26,6 +26,7 @@ import (
 	"github.com/ava-labs/avalanchego/utils/ulimit"
 	"github.com/ava-labs/avalanchego/utils/units"
 	"github.com/ava-labs/avalanchego/vms/components/gas"
+	"github.com/ava-labs/avalanchego/vms/proposervm"
 )
 
 const (
@@ -384,6 +385,9 @@ func addNodeFlags(fs *pflag.FlagSet) {
 	fs.StringToString(TracingHeadersKey, map[string]string{}, "The headers to provide the trace indexer")
 
 	fs.String(ProcessContextFileKey, defaultProcessContextPath, "The path to write process context to (including PID, API URI, and staking address).")
+
+	// Primary Subnet Config
+	fs.Duration(ProposerMinBlockDelayKey, proposervm.DefaultMinBlockDelay, "Minimum delay to enforce when building a snowman++ block for the primary subnet")
 }
 
 // BuildFlagSet returns a complete set of flags for avalanchego

config/keys.go

@@ -208,4 +208,5 @@ const (
 	TracingExporterTypeKey                             = "tracing-exporter-type"
 	TracingHeadersKey                                  = "tracing-headers"
 	ProcessContextFileKey                              = "process-context-file"
+	ProposerMinBlockDelayKey                           = "proposer-min-block-delay"
 )

tests/e2e/x/transfer/virtuous.go

@@ -299,7 +299,6 @@ var _ = e2e.DescribeXChainSerial("[Virtuous Transfer Tx AVAX]", func() {
 
 			for i := 0; i < totalRounds; i++ {
 				runFunc(i)
-				time.Sleep(time.Second)
 			}
 
 			_ = e2e.CheckBootstrapIsPossible(tc, env.GetNetwork())

tests/fixture/e2e/helpers.go

@@ -83,6 +83,8 @@ func NewWallet(tc tests.TestContext, keychain *secp256k1fx.Keychain, nodeURI tmp
 				)
 			},
 		),
+		// Reducing the default from 100ms speeds up detection of tx acceptance
+		common.WithPollFrequency(10*time.Millisecond),
 	)
 	OutputWalletBalances(tc, wallet)
 	return wallet

tests/fixture/tmpnet/defaults.go

@@ -32,6 +32,9 @@ const (
 	// A short minimum stake duration enables testing of staking logic.
 	DefaultMinStakeDuration = time.Second
 
+	// Reducing this from the 1s default speeds up tx acceptance
+	DefaultProposerMinBlockDelay = 0 * time.Second
+
 	defaultConfigFilename = "config.json"
 )
 
@@ -59,6 +62,7 @@ func DefaultTmpnetFlags() FlagsMap {
 		// Specific to e2e testing
 		config.MinStakeDurationKey:           DefaultMinStakeDuration.String(),
 		config.ProposerVMUseCurrentHeightKey: true,
+		config.ProposerMinBlockDelayKey:      DefaultProposerMinBlockDelay,
 	}
 	flags.SetDefaults(DefaultTestFlags())
 	return flags
@@ -76,3 +80,10 @@ func DefaultChainConfigs() map[string]FlagsMap {
 		},
 	}
 }
+
+// A set of subnet configuration appropriate for testing.
+func DefaultSubnetConfig() FlagsMap {
+	return FlagsMap{
+		"proposerMinBlockDelay": DefaultProposerMinBlockDelay,
+	}
+}

tests/fixture/tmpnet/network.go

@@ -674,6 +674,12 @@ func (n *Network) CreateSubnets(ctx context.Context, log logging.Logger, apiURI
 			zap.String("name", subnet.Name),
 		)
 
+		// Apply tmpnet defaults
+		if subnet.Config == nil {
+			subnet.Config = FlagsMap{}
+		}
+		subnet.Config.SetDefaults(DefaultSubnetConfig())
+
 		if subnet.OwningKey == nil {
 			// Allocate a pre-funded key and remove it from the network so it won't be used for
 			// other purposes