bch-api/test/v3/blockchain.js

/*
  TODO:
  -getRawMempool
  --Add tests for 'verbose' input values
  -getMempoolEntry & getMempoolEntryBulk
  --Needs e2e test to create unconfirmed tx, for real-world test.
*/

'use strict'

const chai = require('chai')
const assert = chai.assert
const sinon = require('sinon')

const Blockchain = require('../../src/routes/v3/full-node/blockchain')
const uut = new Blockchain()

const util = require('util')
util.inspect.defaultOptions = { depth: 1 }

if (!process.env.TEST) process.env.TEST = 'unit'

// Mocking data.
const { mockReq, mockRes } = require('./mocks/express-mocks')
const mockData = require('./mocks/blockchain-mock')

let originalEnvVars // Used during transition from integration to unit tests.

describe('#BlockchainRouter', () => {
  let req, res
  let sandbox

  // local node will be started in regtest mode on the port 48332
  // before(panda.runLocalNode)

  before(() => {
    // Save existing environment variables.
    originalEnvVars = {
      BITCOINCOM_BASEURL: process.env.BITCOINCOM_BASEURL,
      RPC_BASEURL: process.env.RPC_BASEURL,
      RPC_USERNAME: process.env.RPC_USERNAME,
      RPC_PASSWORD: process.env.RPC_PASSWORD
    }

    // Set default environment variables for unit tests.
    if (process.env.TEST === 'unit') {
      process.env.BITCOINCOM_BASEURL = 'http://fakeurl/api/'
      process.env.RPC_BASEURL = 'http://fakeurl/api'
      process.env.RPC_USERNAME = 'fakeusername'
      process.env.RPC_PASSWORD = 'fakepassword'
    }
  })

  // Setup the mocks before each test.
  beforeEach(() => {
    // Mock the req and res objects used by Express routes.
    req = mockReq
    res = mockRes

    // Explicitly reset the parmas and body.
    req.params = {}
    req.body = {}
    sandbox = sinon.createSandbox()
  })

  afterEach(() => {
    // Restore Sandbox
    sandbox.restore()
  })

  after(() => {
    // otherwise the panda will run forever
    // process.exit()

    // Restore any pre-existing environment variables.
    process.env.BITCOINCOM_BASEURL = originalEnvVars.BITCOINCOM_BASEURL
    process.env.RPC_BASEURL = originalEnvVars.RPC_BASEURL
    process.env.RPC_USERNAME = originalEnvVars.RPC_USERNAME
    process.env.RPC_PASSWORD = originalEnvVars.RPC_PASSWORD
  })

  describe('#root', () => {
    it('should respond to GET for base route', async () => {
      const result = uut.root(req, res)

      assert.equal(result.status, 'blockchain', 'Returns static string')
    })
  })

  describe('getBestBlockHash()', () => {
    it('should throw 503 when network issues', async () => {
      // Save the existing RPC URL.
      const savedUrl2 = process.env.RPC_BASEURL

      // Manipulate the URL to cause a 500 network error.
      process.env.RPC_BASEURL = 'http://fakeurl/api/'

      const result = await uut.getBestBlockHash(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Restore the saved URL.
      process.env.RPC_BASEURL = savedUrl2

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      const result = await uut.getBestBlockHash(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      const result = await uut.getBestBlockHash(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('should GET /getBestBlockHash', async () => {
      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: mockData.mockBlockHash } })
      }

      const result = await uut.getBestBlockHash(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isString(result)
      assert.equal(result.length, 64, 'Hash string is fixed length')
    })
  })

  describe('getBlockchainInfo()', () => {
    it('should throw 503 when network issues', async () => {
      // Save the existing RPC URL.
      const savedUrl2 = process.env.RPC_BASEURL

      // Manipulate the URL to cause a 500 network error.
      process.env.RPC_BASEURL = 'http://fakeurl/api/'

      const result = await uut.getBlockchainInfo(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Restore the saved URL.
      process.env.RPC_BASEURL = savedUrl2

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      const result = await uut.getBestBlockHash(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      const result = await uut.getBestBlockHash(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('should GET /getBlockchainInfo', async () => {
      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: mockData.mockBlockchainInfo } })
      }

      const result = await uut.getBlockchainInfo(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAnyKeys(result, [
        'chain',
        'blocks',
        'headers',
        'bestblockhash',
        'difficulty',
        'mediantime',
        'verificationprogress',
        'chainwork',
        'pruned',
        'softforks',
        'bip9_softforks'
      ])
    })
  })

  describe('getBlockCount()', () => {
    it('should throw 503 when network issues', async () => {
      // Save the existing RPC URL.
      const savedUrl2 = process.env.RPC_BASEURL

      // Manipulate the URL to cause a 500 network error.
      process.env.RPC_BASEURL = 'http://fakeurl/api/'

      const result = await uut.getBlockCount(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Restore the saved URL.
      process.env.RPC_BASEURL = savedUrl2

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      const result = await uut.getBlockCount(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      const result = await uut.getBlockCount(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('should GET /getBlockCount', async () => {
      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: 126769 } })
      }

      const result = await uut.getBlockCount(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.isNumber(result)
    })
  })

  describe('getBlockHeaderSingle()', async () => {
    it('should throw 400 error if hash is missing', async () => {
      const result = await uut.getBlockHeaderSingle(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAllKeys(result, ['error'])
      assert.include(result.error, 'hash can not be empty')
    })
    it('should throw 503 when network issues', async () => {
      // Save the existing RPC URL.
      const savedUrl2 = process.env.RPC_BASEURL

      // Manipulate the URL to cause a 500 network error.
      process.env.RPC_BASEURL = 'http://fakeurl/api/'

      req.params.hash =
        '00000000000008c3679777df34f1a09565f98b2400a05b7c8da72525fdca3900'

      const result = await uut.getBlockHeaderSingle(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Restore the saved URL.
      process.env.RPC_BASEURL = savedUrl2

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Network error: Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      req.params.hash =
        '00000000000008c3679777df34f1a09565f98b2400a05b7c8da72525fdca3900'

      const result = await uut.getBlockHeaderSingle(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      req.params.hash =
        '00000000000008c3679777df34f1a09565f98b2400a05b7c8da72525fdca3900'

      const result = await uut.getBlockHeaderSingle(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('should GET block header', async () => {
      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox.stub(uut.axios, 'request').resolves({
          data: {
            result:
              '000000202ed2723e7590e2b937f6821a99d6764cb8799bf30f8e300000000000000000001d311c02df9a1e3f57b8dbdcf97ec8dbc3109a26779724c63e560b29ad9ea501e2af955d286403183049e39c'
          }
        })
      }

      req.params.hash =
        '000000000000000002fa9d7851b284c53a5831651b04211c266badf2ad2d8ef0'

      const result = await uut.getBlockHeaderSingle(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.isString(result)
      assert.equal(
        result,
        '000000202ed2723e7590e2b937f6821a99d6764cb8799bf30f8e300000000000000000001d311c02df9a1e3f57b8dbdcf97ec8dbc3109a26779724c63e560b29ad9ea501e2af955d286403183049e39c'
      )
    })

    it('should GET verbose block header', async () => {
      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: mockData.mockBlockHeader } })
      }

      req.query.verbose = true
      req.params.hash =
        '000000000000000002fa9d7851b284c53a5831651b04211c266badf2ad2d8ef0'

      const result = await uut.getBlockHeaderSingle(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAllKeys(result, [
        'hash',
        'confirmations',
        'height',
        'version',
        'versionHex',
        'merkleroot',
        'time',
        'mediantime',
        'nonce',
        'bits',
        'difficulty',
        'chainwork',
        'previousblockhash',
        'nextblockhash',
        'nTx'
      ])
    })
  })

  //

  describe('#getBlockHeaderBulk', () => {
    it('should throw an error for an empty body', async () => {
      req.body = {}

      const result = await uut.getBlockHeaderBulk(req, res)

      assert.equal(res.statusCode, 400, 'HTTP status code 400 expected.')
      assert.include(
        result.error,
        'hashes needs to be an array',
        'Proper error message'
      )
    })

    it('should error on non-array single hash', async () => {
      req.body.hashes =
        '00000000000008c3679777df34f1a09565f98b2400a05b7c8da72525fdca3900'

      const result = await uut.getBlockHeaderBulk(req, res)

      assert.equal(res.statusCode, 400, 'HTTP status code 400 expected.')
      assert.include(
        result.error,
        'hashes needs to be an array',
        'Proper error message'
      )
    })

    it('should throw 400 error if addresses array is too large', async () => {
      const testArray = []
      for (var i = 0; i < 25; i++) testArray.push('')

      req.body.hashes = testArray

      const result = await uut.getBlockHeaderBulk(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAllKeys(result, ['error'])
      assert.include(result.error, 'Array too large')
    })

    it('should throw a 400 error for an invalid hash', async () => {
      req.body.hashes = ['badHash']

      await uut.getBlockHeaderBulk(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.equal(res.statusCode, 400, 'HTTP status code 400 expected.')
    })

    it('should throw 500 when network issues', async () => {
      const savedUrl = process.env.BITCOINCOM_BASEURL

      try {
        req.body.hashes = [
          '00000000000008c3679777df34f1a09565f98b2400a05b7c8da72525fdca3900'
        ]

        // Switch the Insight URL to something that will error out.
        process.env.BITCOINCOM_BASEURL = 'http://fakeurl/api/'

        const result = await uut.getBlockHeaderBulk(req, res)

        // Restore the saved URL.
        process.env.BITCOINCOM_BASEURL = savedUrl

        assert.equal(res.statusCode, 500, 'HTTP status code 500 expected.')
        assert.include(result.error, 'ENOTFOUND', 'Error message expected')
      } catch (err) {
        // Restore the saved URL.
        process.env.BITCOINCOM_BASEURL = savedUrl
      }
    })

    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      req.body.hashes = [
        '000000000000000002fa9d7851b284c53a5831651b04211c266badf2ad2d8ef0'
      ]

      const result = await uut.getBlockHeaderBulk(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      req.body.hashes = [
        '000000000000000002fa9d7851b284c53a5831651b04211c266badf2ad2d8ef0'
      ]

      const result = await uut.getBlockHeaderBulk(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('should get concise block header for a single hash', async () => {
      req.body.hashes = [
        '000000000000000002fa9d7851b284c53a5831651b04211c266badf2ad2d8ef0'
      ]

      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: mockData.mockBlockHeaderConcise } })
      }

      // Call the details API.
      const result = await uut.getBlockHeaderBulk(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Assert that required fields exist in the returned object.
      assert.isArray(result)
      assert.equal(
        result[0],
        '000000202ed2723e7590e2b937f6821a99d6764cb8799bf30f8e300000000000000000001d311c02df9a1e3f57b8dbdcf97ec8dbc3109a26779724c63e560b29ad9ea501e2af955d286403183049e39c'
      )
    })

    it('should get verbose block header for a single hash', async () => {
      req.body = {
        hashes: [
          '000000000000000002fa9d7851b284c53a5831651b04211c266badf2ad2d8ef0'
        ],
        verbose: true
      }

      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: mockData.mockBlockHeader } })
      }

      // Call the details API.
      const result = await uut.getBlockHeaderBulk(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Assert that required fields exist in the returned object.
      assert.isArray(result)
      assert.hasAllKeys(result[0], [
        'hash',
        'confirmations',
        'height',
        'version',
        'versionHex',
        'merkleroot',
        'time',
        'mediantime',
        'nonce',
        'bits',
        'difficulty',
        'chainwork',
        'previousblockhash',
        'nextblockhash',
        'nTx'
      ])
    })

    it('should get details for multiple block heights', async () => {
      req.body.hashes = [
        '000000000000000002fa9d7851b284c53a5831651b04211c266badf2ad2d8ef0',
        '000000000000000002fa9d7851b284c53a5831651b04211c266badf2ad2d8ef0'
      ]

      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: mockData.mockBlockHeaderConcise } })
      }

      // Call the details API.
      const result = await uut.getBlockHeaderBulk(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.isArray(result)
      assert.equal(result.length, 2, '2 outputs for 2 inputs')
    })
  })
  describe('getChainTips()', () => {
    it('should throw 503 when network issues', async () => {
      // Save the existing RPC URL.
      const savedUrl2 = process.env.RPC_BASEURL

      // Manipulate the URL to cause a 500 network error.
      process.env.RPC_BASEURL = 'http://fakeurl/api/'

      const result = await uut.getChainTips(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Restore the saved URL.
      process.env.RPC_BASEURL = savedUrl2

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      const result = await uut.getChainTips(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      const result = await uut.getChainTips(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('should GET /getChainTips', async () => {
      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: mockData.mockChainTips } })
      }

      const result = await uut.getChainTips(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.isArray(result)
      assert.hasAnyKeys(result[0], ['height', 'hash', 'branchlen', 'status'])
    })
  })
  describe('getDifficulty()', () => {
    it('should throw 503 when network issues', async () => {
      // Save the existing RPC URL.
      const savedUrl2 = process.env.RPC_BASEURL

      // Manipulate the URL to cause a 500 network error.
      process.env.RPC_BASEURL = 'http://fakeurl/api/'

      const result = await uut.getDifficulty(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Restore the saved URL.
      process.env.RPC_BASEURL = savedUrl2

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      const result = await uut.getDifficulty(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      const result = await uut.getDifficulty(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('should GET /getDifficulty', async () => {
      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: 4049809.205246544 } })
      }

      const result = await uut.getDifficulty(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.isNumber(result)
    })
  })
  describe('getMempoolInfo()', () => {
    it('should throw 503 when network issues', async () => {
      // Save the existing RPC URL.
      const savedUrl2 = process.env.RPC_BASEURL

      // Manipulate the URL to cause a 500 network error.
      process.env.RPC_BASEURL = 'http://fakeurl/api/'

      const result = await uut.getMempoolInfo(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Restore the saved URL.
      process.env.RPC_BASEURL = savedUrl2

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      const result = await uut.getMempoolInfo(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      const result = await uut.getMempoolInfo(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('should GET /getMempoolInfo', async () => {
      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: mockData.mockMempoolInfo } })
      }

      const result = await uut.getMempoolInfo(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAnyKeys(result, [
        'result',
        'bytes',
        'usage',
        'maxmempool',
        'mempoolminfree'
      ])
    })
  })

  describe('getRawMempool()', () => {
    it('should throw 503 when network issues', async () => {
      // Save the existing RPC URL.
      const savedUrl2 = process.env.RPC_BASEURL

      // Manipulate the URL to cause a 500 network error.
      process.env.RPC_BASEURL = 'http://fakeurl/api/'

      const result = await uut.getRawMempool(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Restore the saved URL.
      process.env.RPC_BASEURL = savedUrl2

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      const result = await uut.getRawMempool(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      const result = await uut.getRawMempool(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('should GET /getRawMempool', async () => {
      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: mockData.mockRawMempool } })
      }

      const result = await uut.getRawMempool(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.isArray(result)
      // Not sure what other assertions should be made here.
    })
  })

  describe('getMempoolEntrySingle()', () => {
    it('should throw 400 if txid is empty', async () => {
      const result = await uut.getMempoolEntrySingle(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAllKeys(result, ['error'])
      assert.include(result.error, 'txid can not be empty')
    })

    it('should throw 503 when network issues', async () => {
      // Save the existing RPC URL.
      const savedUrl2 = process.env.RPC_BASEURL

      // Manipulate the URL to cause a 500 network error.
      process.env.RPC_BASEURL = 'http://fakeurl/api/'

      req.params.txid =
        'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'

      const result = await uut.getMempoolEntrySingle(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Restore the saved URL.
      process.env.RPC_BASEURL = savedUrl2

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      req.params.txid =
        'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'

      const result = await uut.getMempoolEntrySingle(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      req.params.txid =
        'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'

      const result = await uut.getMempoolEntrySingle(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('should GET /getMempoolEntry', async () => {
      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox.stub(uut.axios, 'request').resolves({
          data: { result: { error: 'Transaction not in mempool' } }
        })
      }

      req.params.txid =
        'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'

      const result = await uut.getMempoolEntrySingle(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAllKeys(result, ['error'])
      assert.isString(result.error)
      assert.equal(result.error, 'Transaction not in mempool')
    })
  })
  describe('#getMempoolEntryBulk', () => {
    it('should throw an error for an empty body', async () => {
      req.body = {}

      const result = await uut.getMempoolEntryBulk(req, res)

      assert.equal(res.statusCode, 400, 'HTTP status code 400 expected.')
      assert.include(
        result.error,
        'txids needs to be an array',
        'Proper error message'
      )
    })

    it('should error on non-array single txid', async () => {
      req.body.txids =
        'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'

      const result = await uut.getMempoolEntryBulk(req, res)

      assert.equal(res.statusCode, 400, 'HTTP status code 400 expected.')
      assert.include(
        result.error,
        'txids needs to be an array',
        'Proper error message'
      )
    })

    it('should throw 400 error if addresses array is too large', async () => {
      const testArray = []
      for (var i = 0; i < 25; i++) testArray.push('')

      req.body.txids = testArray

      const result = await uut.getMempoolEntryBulk(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAllKeys(result, ['error'])
      assert.include(result.error, 'Array too large')
    })
    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      req.body.txids = [
        'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'
      ]

      const result = await uut.getMempoolEntryBulk(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      req.body.txids = [
        'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'
      ]

      const result = await uut.getMempoolEntryBulk(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    // Only execute on integration tests.
    if (process.env.TEST !== 'unit') {
      // Dev-note: This test passes because it expects an error. TXIDs do not
      // stay in the mempool for long, so it does not work well for a unit or
      // integration test.
      it('should retrieve single mempool entry', async () => {
        req.body.txids = [
          'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'
        ]

        const result = await uut.getMempoolEntryBulk(req, res)
        // console.log(`result: ${util.inspect(result)}`)

        assert.hasAllKeys(result, ['error'])
        assert.isString(result.error)
        assert.equal(result.error, 'Transaction not in mempool')
      })

      // Dev-note: This test passes because it expects an error. TXIDs do not
      // stay in the mempool for long, so it does not work well for a unit or
      // integration test.
      it('should retrieve multiple mempool entries', async () => {
        req.body.txids = [
          'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde',
          'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'
        ]

        const result = await uut.getMempoolEntryBulk(req, res)
        // console.log(`result: ${util.inspect(result)}`)

        assert.hasAllKeys(result, ['error'])
        assert.isString(result.error)
        assert.equal(result.error, 'Transaction not in mempool')
      })
    }
  })
  describe('getMempoolAncestorsSingle()', () => {
    it('should throw 400 if txid is empty', async () => {
      const result = await uut.getMempoolAncestorsSingle(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAllKeys(result, ['error'])
      assert.include(result.error, 'txid can not be empty')
    })

    it('should throw 503 when network issues', async () => {
      // Save the existing RPC URL.
      const savedUrl2 = process.env.RPC_BASEURL

      // Manipulate the URL to cause a 500 network error.
      process.env.RPC_BASEURL = 'http://fakeurl/api/'

      req.params.txid =
        'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'

      const result = await uut.getMempoolAncestorsSingle(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Restore the saved URL.
      process.env.RPC_BASEURL = savedUrl2

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      req.params.txid =
        'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'

      const result = await uut.getMempoolAncestorsSingle(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      req.params.txid =
        'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'

      const result = await uut.getMempoolAncestorsSingle(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('should GET /getMempoolAncestorsSingle', async () => {
      sandbox
        .stub(uut.axios, 'request')
        .resolves({ data: { result: mockData.mockAncestors } })

      req.params.txid =
        'bb0d349892d351da2767f8c45f6f7949713ff09bd12838d53e76158ddee3ce93'

      const result = await uut.getMempoolAncestorsSingle(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.isArray(result)
    })
  })

  describe('getTxOut()', () => {
    it('should throw 400 if txid is empty', async () => {
      const result = await uut.getTxOut(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAllKeys(result, ['error'])
      assert.include(result.error, 'txid can not be empty')
    })

    it('should throw 400 if n is empty', async () => {
      req.params.txid = 'sometxid'
      const result = await uut.getTxOut(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAllKeys(result, ['error'])
      assert.include(result.error, 'n can not be empty')
    })

    it('should throw 503 when network issues', async () => {
      // Save the existing RPC URL.
      const savedUrl2 = process.env.RPC_BASEURL

      // Manipulate the URL to cause a 500 network error.
      process.env.RPC_BASEURL = 'http://fakeurl/api/'

      req.params.txid =
        'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'
      req.params.n = 0

      const result = await uut.getTxOut(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Restore the saved URL.
      process.env.RPC_BASEURL = savedUrl2

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      req.params.txid =
        '197dcda59864b1eee05498fd3c52cad787ec56ab7e635503cb39f9ab6f295d5d'
      req.params.n = 0
      req.query.include_mempool = 'true'

      const result = await uut.getTxOut(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      req.params.txid =
        '197dcda59864b1eee05498fd3c52cad787ec56ab7e635503cb39f9ab6f295d5d'
      req.params.n = 0
      req.query.include_mempool = 'true'

      const result = await uut.getTxOut(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    // This test can only run for unit tests. See TODO at the top of this file.
    it('should GET /getTxOut', async () => {
      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: mockData.mockTxOut } })
      }

      req.params.txid =
        '197dcda59864b1eee05498fd3c52cad787ec56ab7e635503cb39f9ab6f295d5d'
      req.params.n = 0
      req.query.include_mempool = 'true'

      const result = await uut.getTxOut(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.hasAllKeys(result, [
        'bestblock',
        'confirmations',
        'value',
        'scriptPubKey',
        'coinbase'
      ])
      assert.hasAllKeys(result.scriptPubKey, [
        'asm',
        'hex',
        'reqSigs',
        'type',
        'addresses'
      ])
      assert.isArray(result.scriptPubKey.addresses)
    })
  })

  describe('getTxOutPost()', () => {
    it('should throw 400 if txid is empty', async () => {
      const result = await uut.getTxOutPost(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAllKeys(result, ['error'])
      assert.include(result.error, 'txid can not be empty')
    })

    it('should throw 400 if n is empty', async () => {
      req.body.txid = 'sometxid'
      const result = await uut.getTxOutPost(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAllKeys(result, ['error'])
      assert.include(result.error, 'vout can not be empty')
    })

    it('should throw 503 when network issues', async () => {
      // Save the existing RPC URL.
      const savedUrl2 = process.env.RPC_BASEURL

      // Manipulate the URL to cause a 500 network error.
      process.env.RPC_BASEURL = 'http://fakeurl/api/'

      req.body.txid =
        'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'
      req.body.vout = 0

      const result = await uut.getTxOutPost(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Restore the saved URL.
      process.env.RPC_BASEURL = savedUrl2

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      req.body.txid =
        '197dcda59864b1eee05498fd3c52cad787ec56ab7e635503cb39f9ab6f295d5d'
      req.body.vout = 0
      req.body.mempool = true

      const result = await uut.getTxOutPost(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      req.body.txid =
        '197dcda59864b1eee05498fd3c52cad787ec56ab7e635503cb39f9ab6f295d5d'
      req.body.vout = 0
      req.body.mempool = true

      const result = await uut.getTxOutPost(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('should POST /getTxOut', async () => {
      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: mockData.mockTxOut } })
      }

      req.body.txid =
        '197dcda59864b1eee05498fd3c52cad787ec56ab7e635503cb39f9ab6f295d5d'
      req.body.vout = 0
      req.body.mempool = true

      const result = await uut.getTxOutPost(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.hasAllKeys(result, [
        'bestblock',
        'confirmations',
        'value',
        'scriptPubKey',
        'coinbase'
      ])
      assert.hasAllKeys(result.scriptPubKey, [
        'asm',
        'hex',
        'reqSigs',
        'type',
        'addresses'
      ])
      assert.isArray(result.scriptPubKey.addresses)
    })
  })

  describe('getTxOutProofSingle()', () => {
    it('should throw 400 if txid is empty', async () => {
      const result = await uut.getTxOutProofSingle(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAllKeys(result, ['error'])
      assert.include(result.error, 'txid can not be empty')
    })

    it('should throw 503 when network issues', async () => {
      // Save the existing RPC URL.
      const savedUrl2 = process.env.RPC_BASEURL

      // Manipulate the URL to cause a 500 network error.
      process.env.RPC_BASEURL = 'http://fakeurl/api/'

      req.params.txid =
        'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'

      const result = await uut.getTxOutProofSingle(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Restore the saved URL.
      process.env.RPC_BASEURL = savedUrl2

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      req.params.txid =
        '197dcda59864b1eee05498fd3c52cad787ec56ab7e635503cb39f9ab6f295d5d'
      req.params.n = 0
      req.query.include_mempool = 'true'

      const result = await uut.getTxOutProofSingle(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      req.params.txid =
        '197dcda59864b1eee05498fd3c52cad787ec56ab7e635503cb39f9ab6f295d5d'
      req.params.n = 0
      req.query.include_mempool = 'true'

      const result = await uut.getTxOutProofSingle(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('should GET /getTxOutProof', async () => {
      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: mockData.mockTxOutProof } })
      }

      req.params.txid =
        '2c7ae9f865f7ce0c33c189b2f83414176903ce4b06ed9f8b7bcf55efbd4a7266'

      const result = await uut.getTxOutProofSingle(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isString(result)
    })
  })

  describe('#getTxOutProofBulk', () => {
    it('should throw an error for an empty body', async () => {
      req.body = {}

      const result = await uut.getTxOutProofBulk(req, res)

      assert.equal(res.statusCode, 400, 'HTTP status code 400 expected.')
      assert.include(
        result.error,
        'txids needs to be an array',
        'Proper error message'
      )
    })

    it('should error on non-array single txid', async () => {
      req.body.txids =
        'd65881582ff2bff36747d7a0d0e273f10281abc8bd5c15df5d72f8f3fa779cde'

      const result = await uut.getTxOutProofBulk(req, res)

      assert.equal(res.statusCode, 400, 'HTTP status code 400 expected.')
      assert.include(
        result.error,
        'txids needs to be an array',
        'Proper error message'
      )
    })

    it('should throw 400 error if addresses array is too large', async () => {
      const testArray = []
      for (var i = 0; i < 25; i++) testArray.push('')

      req.body.txids = testArray

      const result = await uut.getTxOutProofBulk(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAllKeys(result, ['error'])
      assert.include(result.error, 'Array too large')
    })

    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      req.body.txids = [
        '2c7ae9f865f7ce0c33c189b2f83414176903ce4b06ed9f8b7bcf55efbd4a7266'
      ]

      const result = await uut.getTxOutProofBulk(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      req.body.txids = [
        '2c7ae9f865f7ce0c33c189b2f83414176903ce4b06ed9f8b7bcf55efbd4a7266'
      ]

      const result = await uut.getTxOutProofBulk(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('should GET proof for single txid', async () => {
      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: mockData.mockTxOutProof } })
      }

      req.body.txids = [
        '2c7ae9f865f7ce0c33c189b2f83414176903ce4b06ed9f8b7bcf55efbd4a7266'
      ]

      const result = await uut.getTxOutProofBulk(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isArray(result)
      assert.isString(result[0])
    })

    it('should GET proof for multiple txids', async () => {
      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: mockData.mockTxOutProof } })
      }

      req.body.txids = [
        '2c7ae9f865f7ce0c33c189b2f83414176903ce4b06ed9f8b7bcf55efbd4a7266',
        '2c7ae9f865f7ce0c33c189b2f83414176903ce4b06ed9f8b7bcf55efbd4a7266'
      ]

      const result = await uut.getTxOutProofBulk(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isArray(result)
      assert.equal(result.length, 2, 'Correct length of returned array')
    })
  })
  describe('verifyTxOutProofSingle()', () => {
    it('should throw 400 if proof is empty', async () => {
      const result = await uut.verifyTxOutProofSingle(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAllKeys(result, ['error'])
      assert.include(result.error, 'proof can not be empty')
    })

    it('should throw 503 when network issues', async () => {
      // Save the existing RPC URL.
      const savedUrl2 = process.env.RPC_BASEURL

      // Manipulate the URL to cause a 500 network error.
      process.env.RPC_BASEURL = 'http://fakeurl/api/'

      req.params.proof = mockData.mockTxOutProof

      const result = await uut.verifyTxOutProofSingle(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      // Restore the saved URL.
      process.env.RPC_BASEURL = savedUrl2

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      req.params.proof =
        '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'

      const result = await uut.verifyTxOutProofSingle(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      req.params.proof =
        '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'

      const result = await uut.verifyTxOutProofSingle(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('should GET /verifyTxOutProof', async () => {
      const expected =
        '2c7ae9f865f7ce0c33c189b2f83414176903ce4b06ed9f8b7bcf55efbd4a7266'

      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: [expected] } })
      }

      req.params.proof =
        '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'

      const result = await uut.verifyTxOutProofSingle(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isArray(result)
      assert.isString(result[0])
      assert.equal(result[0], expected)
    })
  })
  describe('#verifyTxOutProofBulk', () => {
    it('should throw an error for an empty body', async () => {
      req.body = {}

      const result = await uut.verifyTxOutProofBulk(req, res)

      assert.equal(res.statusCode, 400, 'HTTP status code 400 expected.')
      assert.include(
        result.error,
        'proofs needs to be an array',
        'Proper error message'
      )
    })

    it('should error on non-array single txid', async () => {
      req.body.proofs = mockData.mockTxOutProof

      const result = await uut.verifyTxOutProofBulk(req, res)

      assert.equal(res.statusCode, 400, 'HTTP status code 400 expected.')
      assert.include(
        result.error,
        'proofs needs to be an array',
        'Proper error message'
      )
    })

    it('should throw 400 error if addresses array is too large', async () => {
      const testArray = []
      for (var i = 0; i < 25; i++) testArray.push('')

      req.body.proofs = testArray

      const result = await uut.verifyTxOutProofBulk(req, res)
      // console.log(`result: ${util.inspect(result)}`)

      assert.hasAllKeys(result, ['error'])
      assert.include(result.error, 'Array too large')
    })

    it('returns proper error when downstream service stalls', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNABORTED' })

      req.body.proofs = [
        '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'
      ]
      const result = await uut.verifyTxOutProofBulk(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })
    it('returns proper error when downstream service is down', async () => {
      // Mock the timeout error.
      sandbox.stub(uut.axios, 'request').throws({ code: 'ECONNREFUSED' })

      req.body.proofs = [
        '000000202ed2723e7590e2b937f6821a99d6764cb8799bf30f8e300000000000000000001d311c02df9a1e3f57b8dbdcf97ec8dbc3109a26779724c63e560b29ad9ea501e2af955d286403183049e39c1e000000067139f230701a2819a76795564bd2f67ded7eeae68596f368eddb3dd5bc54e59320e896f71d61cfc3ae3d4a90fca08b1aa35ba91256d8939d2cad11e638c0081f66724abdef55cf7b8b9fed064bce0369171434f8b289c1330ccef765f8e97a2c0d794d81aafb535855f7daa6bb51e40f77c6b59d7af7f62d0eb726a4fc4df82353d56fcbda7c7ea6bd935d61af8fb3b295637e6f323b10231135b3f10a034cfb238f635830c0595e52c6c31247cf677b555f7a287076e20cd0e1d3cc9af7260f02b700'
      ]
      const result = await uut.verifyTxOutProofBulk(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isAbove(res.statusCode, 499, 'HTTP status code 503 expected.')
      assert.include(
        result.error,
        'Could not communicate with full node',
        'Error message expected'
      )
    })

    it('should get single proof', async () => {
      const expected =
        '2c7ae9f865f7ce0c33c189b2f83414176903ce4b06ed9f8b7bcf55efbd4a7266'

      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: [expected] } })
      }

      req.body.proofs = [
        '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'
      ]

      const result = await uut.verifyTxOutProofBulk(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isArray(result)
      assert.isString(result[0])
      assert.equal(result[0], expected)
    })

    it('should get multiple proofs', async () => {
      const expected =
        '2c7ae9f865f7ce0c33c189b2f83414176903ce4b06ed9f8b7bcf55efbd4a7266'

      // Mock the RPC call for unit tests.
      if (process.env.TEST === 'unit') {
        sandbox
          .stub(uut.axios, 'request')
          .resolves({ data: { result: [expected] } })
      }

      req.body.proofs = [
        '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',
        '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'
      ]

      const result = await uut.verifyTxOutProofBulk(req, res)
      // console.log(`result: ${JSON.stringify(result, null, 2)}`)

      assert.isArray(result)
      assert.isString(result[0])
      assert.equal(result[0], expected)
      assert.equal(result.length, 2)
    })
  })
})