test: delay slot0 production by 4s

beacon-chain/rpc/prysm/v1alpha1/validator/proposer.go

@@ -347,6 +347,10 @@ func (vs *Server) proposeGenericBeaconBlock(ctx context.Context, blk interfaces.
 	ctx, span := trace.StartSpan(ctx, "ProposerServer.proposeGenericBeaconBlock")
 	defer span.End()
 
+	if blk.Block().Slot()%params.BeaconConfig().SlotsPerEpoch == 0 {
+		time.Sleep(4 * time.Second)
+	}
+
 	// Do not block proposal critical path with debug logging or block feed updates.
 	defer func() {
 		log.WithField("slot", blk.Block().Slot()).Debugf(

config/params/testnet_e2e_config.go

@@ -21,7 +21,7 @@ func E2ETestConfig() *BeaconChainConfig {
 	e2eConfig.MaxValidatorsPerWithdrawalsSweep = 128
 
 	// Time parameters.
-	e2eConfig.SecondsPerSlot = 10
+	e2eConfig.SecondsPerSlot = 12
 	e2eConfig.SlotsPerEpoch = 6
 	e2eConfig.SqrRootSlotsPerEpoch = 2
 	e2eConfig.SecondsPerETH1Block = 2