errnext/lib/test.js

Generic middleware based on (err, next, ...args) pattern.

'use strict';

var _index = require('./index');

function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } } /* eslint-env jest */


describe('compose', function () {
  it('calls 1 function', function (done) {
    (0, _index.compose)(function (err, next) {
      return next(err, 1);
    }, function (err, next, x) {
      return next(err, x * 2);
    }, function (err, next, x) {
      expect(err).toEqual(undefined);
      expect(x).toEqual(2);
      done();
    })();
  });
  it('callNext', function (done) {
    (0, _index.compose)(function (err, next) {
      return next(err, 1);
    }, _index.callNext, function (err, next, x) {
      return next(err, x * 10);
    }, function (err, next, result) {
      expect(err).toEqual(undefined);
      expect(result).toEqual(10);
      done();
    })();
  });
  it('null', function (done) {
    (0, _index.compose)(function (err, next) {
      return next(err, 1);
    }, null, function (err, next, x) {
      return next(err, x * 10);
    }, function (err, next, result) {
      expect(err).toEqual(undefined);
      expect(result).toEqual(10);
      done();
    })();
  });
  it('calls more functions', function (done) {
    (0, _index.compose)(function (err, next) {
      return next(err, 1);
    }, function (err, next, x) {
      return next(err, x * 2);
    }, function (err, next, x) {
      return next(err, x * 3);
    }, function (err, next, x) {
      return next(err, x * 10);
    }, function (err, next, x) {
      return next(err, x + 0.5);
    }, function (err, next, result) {
      expect(err).toEqual(undefined);
      expect(result).toEqual(60.5);
      done();
    })();
  });
  it('works with multiple arguments', function (done) {
    (0, _index.compose)(function (err, next) {
      return next(err, 1);
    }, function (err, next, x) {
      return next(err, x, 2);
    }, function (err, next, x, y) {
      return next(err, x + y, 10, 100);
    }, function (err, next, x, y, z) {
      return next(err, x + y + z);
    }, function (err, next, result) {
      expect(err).toEqual(undefined);
      expect(result).toEqual(113);
      done();
    })();
  });
  it('calls 10000 functions', function (done) {
    var fns = Array(10000).fill(function (err, next, x) {
      return next(err, x + 1);
    });
    _index.compose.apply(undefined, _toConsumableArray(fns))(null, function (err, x) {
      expect(err).toEqual(null);
      expect(x).toEqual(10000);
      done();
    }, 0);
  });
});