x402-base-facilitator/test/unit/adapters/facilitator.js

import { assert } from 'chai'
import sinon from 'sinon'
import FacilitatorLib from '../../../src/adapters/facilitator.js'
let uut
let sandbox

describe('Facilitator', () => {
  beforeEach(() => {
    uut = new FacilitatorLib()

    sandbox = sinon.createSandbox()
  })

  afterEach(() => sandbox.restore())

  describe('start()', () => {
    it('should throw error if EVM_PRIVATE_KEY property is not provided', async () => {
      try {
        await uut.start()
        assert(false, 'Unexpected result')
      } catch (err) {
        assert.include(err.message, "Property 'EVM_PRIVATE_KEY' must be a string!")
      }
    })

    it('should start the facilitator', async () => {
      try {
        uut.EVM_PRIVATE_KEY = '0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef'

        const viewClientMock = {
          getCode: sandbox.stub().resolves('0x1'),
          readContract: sandbox.stub().resolves({}),
          verifyTypedData: sandbox.stub().resolves(true),
          writeContract: sandbox.stub().resolves('0xhash'),
          sendTransaction: sandbox.stub().resolves('0xhash'),
          waitForTransactionReceipt: sandbox.stub().resolves({})
        }

        sandbox.stub(uut, 'privateKeyToAccount').returns({
          address: '0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef',
          privateKey: '0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef'
        })

        sandbox.stub(uut, 'createWalletClient').returns({
          extend: () => viewClientMock
        })

        const signerStub = sandbox.stub(uut, 'toFacilitatorEvmSigner').returns({ address: '0x123' })

        await uut.start()

        // Cover all the methods of the signer
        const signerConfig = signerStub.firstCall.args[0]

        await signerConfig.getCode({ address: '0x1' })
        await signerConfig.readContract({ address: '0x1', abi: [], functionName: 'test' })
        await signerConfig.verifyTypedData({})
        await signerConfig.writeContract({ address: '0x1', abi: [], functionName: 'test' })
        await signerConfig.sendTransaction({})
        await signerConfig.waitForTransactionReceipt({})
      } catch (err) {
        assert(false, 'Unexpected result')
      }
    })
  })
})