fix: stabilize e2e_bot test fees and fix L1 nonce races (backport #20962 #20992 #21148)

BEGIN_COMMIT_OVERRIDE
fix: set wallet minFeePadding in BotFactory constructor (#20992)
fix: increase minFeePadding in e2e_bot bridge resume tests and harden GasFees.mul() (#20962)
fix: use dedicated L1 account for bot bridge resume tests to avoid nonce race (#21148)
fix: remove stale fee snapshot from BotFactory account deployment
END_COMMIT_OVERRIDE

Backports three fixes from next and adds a fourth:

1. BotFactory constructor now calls wallet.setMinFeePadding() so all
   setup transactions (token deploy, minting) use the configured padding
   instead of the wallet default (0.5x). (#20992)

2. GasFees.mul() uses bigint arithmetic for integer scalars to avoid
   precision loss, and Math.ceil for non-integer scalars. (#20962)

3. Bridge resume tests use a dedicated L1 private key (index 7) instead
   of the default mnemonic shared with the sequencer, avoiding nonce
   races on approve/deposit calls. (#21148)

4. Remove explicit maxFeesPerGas snapshot from setupAccountWithPrivateKey.
   Let the wallet re-estimate fees at send() time via completeFeeOptions(),
   making the fee estimate fresh and 10x padding sufficient.

Author: AztecBot

yarn-project/bot/src/factory.ts

@@ -27,7 +27,6 @@ import { PrivateTokenContract } from '@aztec/noir-contracts.js/PrivateToken';
 import { TokenContract } from '@aztec/noir-contracts.js/Token';
 import { TestContract } from '@aztec/noir-test-contracts.js/Test';
 import type { ContractInstanceWithAddress } from '@aztec/stdlib/contract';
-import { GasSettings } from '@aztec/stdlib/gas';
 import type { AztecNode, AztecNodeAdmin } from '@aztec/stdlib/interfaces/client';
 import { deriveSigningKey } from '@aztec/stdlib/keys';
 import { EmbeddedWallet } from '@aztec/wallets/embedded';
@@ -49,7 +48,11 @@ export class BotFactory {
     private readonly store: BotStore,
     private readonly aztecNode: AztecNode,
     private readonly aztecNodeAdmin?: AztecNodeAdmin,
-  ) {}
+  ) {
+    // Set fee padding on the wallet so that all transactions during setup
+    // (token deploy, minting, etc.) use the configured padding, not the default.
+    this.wallet.setMinFeePadding(config.minFeePadding);
+  }
 
   /**
    * Initializes a new bot by setting up the sender account, registering the recipient,
@@ -218,13 +221,11 @@ export class BotFactory {
 
       const paymentMethod = new FeeJuicePaymentMethodWithClaim(accountManager.address, claim);
       const deployMethod = await accountManager.getDeployMethod();
-      const maxFeesPerGas = (await this.aztecNode.getCurrentMinFees()).mul(1 + this.config.minFeePadding);
-      const gasSettings = GasSettings.default({ maxFeesPerGas });
 
       await this.withNoMinTxsPerBlock(async () => {
         const { txHash } = await deployMethod.send({
           from: AztecAddress.ZERO,
-          fee: { gasSettings, paymentMethod },
+          fee: { paymentMethod },
           wait: NO_WAIT,
         });
         this.log.info(`Sent tx for account deployment with hash ${txHash.toString()}`);

yarn-project/end-to-end/src/e2e_bot.test.ts

@@ -52,6 +52,9 @@ describe('e2e_bot', () => {
 
   afterAll(() => teardown());
 
+  let privateKeyIndex = 10;
+  const getPrivateKey = () => new SecretValue(bufferToHex(getPrivateKeyFromIndex(privateKeyIndex++)!));
+
   describe('transaction-bot', () => {
     let bot: Bot;
     beforeAll(async () => {
@@ -131,10 +134,12 @@ describe('e2e_bot', () => {
 
         l1RpcUrls,
         feePaymentMethod: 'fee_juice',
-        // TODO: this should be taken from the `setup` call above
-        l1Mnemonic: new SecretValue('test test test test test test test test test test test junk'),
+        // Use a dedicated L1 account (index 7) for bridging. The default mnemonic account (index 0)
+        // is shared with the sequencer which sends L1 block proposals, causing nonce races on the
+        // approve/deposit calls in bridgeL1FeeJuice.
+        l1PrivateKey: new SecretValue(bufferToHex(getPrivateKeyFromIndex(7)!)),
         flushSetupTransactions: true,
-        // Increase fee headroom to handle fee volatility from rapid block building in tests
+        // Fee headroom to handle fee volatility from rapid block building in tests.
         minFeePadding: 9,
       };
 
@@ -171,10 +176,10 @@ describe('e2e_bot', () => {
 
         l1RpcUrls,
         feePaymentMethod: 'fee_juice',
-        // TODO: this should be taken from the `setup` call above
-        l1Mnemonic: new SecretValue('test test test test test test test test test test test junk'),
+        // Dedicated L1 account to avoid nonce races with the sequencer.
+        l1PrivateKey: new SecretValue(bufferToHex(getPrivateKeyFromIndex(7)!)),
         flushSetupTransactions: true,
-        // Increase fee headroom to handle fee volatility from rapid block building in tests
+        // Fee headroom to handle fee volatility from rapid block building in tests.
         minFeePadding: 9,
       };
 
@@ -235,7 +240,7 @@ describe('e2e_bot', () => {
         followChain: 'PROPOSED',
         botMode: 'transfer',
         senderPrivateKey: new SecretValue(Fr.random()),
-        l1PrivateKey: new SecretValue(bufferToHex(getPrivateKeyFromIndex(8)!)),
+        l1PrivateKey: getPrivateKey(),
         l1RpcUrls,
         flushSetupTransactions: true,
       };
@@ -258,7 +263,7 @@ describe('e2e_bot', () => {
         followChain: 'PROPOSED',
         botMode: 'crosschain',
         l1RpcUrls,
-        l1PrivateKey: new SecretValue(bufferToHex(getPrivateKeyFromIndex(9)!)),
+        l1PrivateKey: getPrivateKey(),
         flushSetupTransactions: true,
         l1ToL2SeedCount: 2,
       };

yarn-project/stdlib/src/gas/gas_fees.ts

@@ -56,8 +56,14 @@ export class GasFees {
       return this.clone();
     } else if (typeof scalar === 'bigint') {
       return new GasFees(this.feePerDaGas * scalar, this.feePerL2Gas * scalar);
+    } else if (Number.isInteger(scalar)) {
+      const s = BigInt(scalar);
+      return new GasFees(this.feePerDaGas * s, this.feePerL2Gas * s);
     } else {
-      return new GasFees(Number(this.feePerDaGas) * scalar, Number(this.feePerL2Gas) * scalar);
+      return new GasFees(
+        BigInt(Math.ceil(Number(this.feePerDaGas) * scalar)),
+        BigInt(Math.ceil(Number(this.feePerL2Gas) * scalar)),
+      );
     }
   }