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fix(acceptance): wait for L2 clock catch-up in flashblocks tests #20013

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fix(acceptance): wait for L2 clock catch-up in flashblocks tests #20013

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7 changes: 7 additions & 0 deletions op-acceptance-tests/tests/flashblocks/utils.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@ package flashblocks
import (
"context"
"sync"
"time"

"github.com/ethereum-optimism/optimism/op-devstack/devtest"
"github.com/ethereum-optimism/optimism/op-devstack/presets"
Expand All @@ -28,6 +29,12 @@ func driveViaTestSequencer(t devtest.T, sys *presets.SingleChainWithFlashblocks,
// Ensure the sequencer EL has produced at least one unsafe block before subscribing.
sys.L2EL.WaitForBlockNumber(1)

// Wait until L2 time catches up to wall clock time before relying on flashblocks.
// During startup the builder may report "unsafe block timestamp is too old" /
// "FCU arrived too late" while the sequencer is still catching up, which makes
// early flashblock receipt assertions flaky.
sys.L2EL.WaitForTime(uint64(time.Now().Unix()))

// Log the latest unsafe head and L1 origin to confirm block production before listening.
head = sys.L2EL.BlockRefByLabel(eth.Unsafe)
sys.Log.Info("Pre-listen unsafe head", "unsafe", head)
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