Function createAndMockGasTarget

packages/airnode-node/test/mock-utils.ts:63–113

(txType: 'legacy' | 'eip1559')

 * Creates and mocks gas pricing-related resources based on txType.
 */
export const createAndMockGasTarget = (txType: 'legacy' | 'eip1559'): GasTargetMock => {
  const gasPriceSpy = jest.spyOn(ethers.providers.StaticJsonRpcProvider.prototype, 'getGasPrice');
  const blockSpy = jest.spyOn(ethers.providers.StaticJsonRpcProvider.prototype, 'getBlock');
  // Ethers does not export BlockWithTransactions so using a custom type definition to include the transactions array
  const blockWithTransactionsSpy = jest.spyOn(
    ethers.providers.StaticJsonRpcProvider.prototype,
    'getBlockWithTransactions'
  ) as unknown as jest.SpyInstance<
    Promise<ethers.providers.Block & { transactions: ethers.providers.TransactionResponse[] }>
  >;

  const gasLimit = ethers.BigNumber.from(500_000);
  const gasPrice = ethers.BigNumber.from(1_000);

  if (txType === 'legacy') {
    gasPriceSpy.mockResolvedValue(gasPrice);
    blockWithTransactionsSpy
      .mockResolvedValue({
        number: 23,
        transactions: Array(20).fill({ gasPrice }),
      } as any)
      .mockResolvedValue({
        number: 3,
        transactions: Array(20).fill({ gasPrice }),
      } as any);
    return { gasTarget: { type: 0, gasPrice, gasLimit }, blockSpy, gasPriceSpy, blockWithTransactionsSpy };
  }

  const baseFeePerGas = ethers.BigNumber.from(999);
  blockSpy.mockResolvedValue({ baseFeePerGas } as ethers.providers.Block);
  const maxPriorityFeePerGas = BigNumber.from(1);
  const maxFeePerGas = baseFeePerGas.mul(BASE_FEE_MULTIPLIER).add(maxPriorityFeePerGas);
  blockWithTransactionsSpy
    .mockResolvedValue({
      number: 23,
      baseFeePerGas,
      transactions: Array(20).fill({ maxPriorityFeePerGas, maxFeePerGas }),
    } as any)
    .mockResolvedValue({
      number: 3,
      baseFeePerGas,
      transactions: Array(20).fill({ maxPriorityFeePerGas, maxFeePerGas }),
    } as any);

  return {
    gasTarget: { type: 2, maxFeePerGas: gasPrice, maxPriorityFeePerGas: gasPrice, gasLimit },
    blockSpy,
    gasPriceSpy,
    blockWithTransactionsSpy,
  };
};

// Declare originalFs outside of mockReadFileSync to prevent infinite recursion errors in mockReadFileSync.
const originalFs = fs.readFileSync;