jest-kefir/dist/index.js

Jest plugin for asserting on Kefir Observables

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = jestKefir;

var _kefirTestUtils = _interopRequireDefault(require("kefir-test-utils"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }

function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

const noop = () => {};

function jestKefir(Kefir) {
  const helpers = (0, _kefirTestUtils.default)(Kefir);
  const {
    activate,
    deactivate,
    send,
    error,
    watch,
    withFakeTime,
    watchWithTime
  } = helpers;
  const extensions = {
    toBeObservable(received) {
      return {
        pass: received instanceof Kefir.Observable,
        message: () => `expected ${received} to be an instance of Kefir.Observable`
      };
    },

    toBeProperty(received) {
      return {
        pass: received instanceof Kefir.Property,
        message: () => `expected ${received} to be an instance of Kefir.Property`
      };
    },

    toBeStream(received) {
      return {
        pass: received instanceof Kefir.Stream,
        message: () => `expected ${received} to be an instance of Kefir.Stream`
      };
    },

    toBePool(received) {
      return {
        pass: received instanceof Kefir.Pool,
        message: () => `expected ${received} to be an instance of Kefir.Pool`
      };
    },

    toBeActiveObservable(received) {
      return {
        pass: !!received._active,
        message: () => `expected ${received} to be an active observable`
      };
    },

    toEmit(received, expected, cb = noop) {
      const {
        log,
        unwatch
      } = watch(received);
      cb();
      unwatch();
      const options = {
        comment: 'Emitted values',
        isNot: this.isNot,
        promise: this.promise
      };
      const pass = this.equals(log, expected);
      const message = pass ? () => this.utils.matcherHint('toEmit', undefined, undefined, options) + '\n\n' + `Expected: not ${this.utils.printExpected(expected)}\n` + `Received: ${this.utils.printReceived(log)}` : () => {
        const diffString = this.utils.diff(expected, log, {
          expand: this.expand
        });
        return this.utils.matcherHint('toEmit', undefined, undefined, options) + '\n\n' + (diffString && diffString.includes('- Expect') ? `Difference:\n\n${diffString}` : `Expected: ${this.utils.printExpected(expected)}\n` + `Received: ${this.utils.printReceived(log)}`);
      };
      return {
        pass,
        message
      };
    },

    toEmitInTime(received, expected, cb = noop, {
      timeLimit = 10000,
      reverseSimultaneous = false
    } = {}) {
      let log = null;
      withFakeTime((tick, clock) => {
        log = watchWithTime(received);
        cb(tick, clock);
        tick(timeLimit);
      }, reverseSimultaneous);
      const options = {
        comment: 'Emitted values',
        isNot: this.isNot,
        promise: this.promise
      };
      const pass = this.equals(log, expected);
      const message = pass ? () => this.utils.matcherHint('toEmitInTime', undefined, undefined, options) + '\n\n' + `Expected: not ${this.utils.printExpected(expected)}\n` + `Received: ${this.utils.printReceived(log)}` : () => {
        const diffString = this.utils.diff(expected, log, {
          expand: this.expand
        });
        return this.utils.matcherHint('toEmitInTime', undefined, undefined, options) + '\n\n' + (diffString && diffString.includes('- Expect') ? `Difference:\n\n${diffString}` : `Expected: ${this.utils.printExpected(expected)}\n` + `Received: ${this.utils.printReceived(log)}`);
      };
      return {
        pass,
        message
      };
    },

    toFlowErrors(received, source = received) {
      const expected = [error(-2), error(-3)];

      if (received instanceof Kefir.Property) {
        activate(received);
        send(source, [error(-1)]);
        deactivate(received);
        expected.unshift(error(-1, {
          current: true
        }));
      }

      const {
        log,
        unwatch
      } = watch(received);
      send(source, [error(-2), error(-3)]);
      unwatch();
      return {
        pass: this.equals(log, expected),
        message: () => `expected errors to flow`
      };
    }

  };
  return _objectSpread({}, helpers, {
    extensions
  });
}