futoin-asyncsteps/es5/testcase.js

Mimic traditional threads in single threaded event loop

"use strict";

/**
 * @file Module's entry point and AsyncSteps class itself
 * @author Andrey Galkin <andrey@futoin.org>
 *
 *
 * Copyright 2018 FutoIn Project (https://futoin.org)
 * Copyright 2018 Andrey Galkin <andrey@futoin.org>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
var AsyncSteps = require('./AsyncSteps');

/* globals ExecFunc */
/* globals ErrorFunc */

/**
 * Mocha-compatible test case based on AsyncSteps.
 *
 * Example:
 * ```javascript
 * it('should ...', $as_test( (as) => {}, (as, err) => {} );
 * ```
 * @param {ExecFunc} func - function defining non-blocking step execution
 * @param {ErrorFunc} [onerror] - Optional, provide error handler
 * @returns {Function} suitable for `it()` Mocha call
 * @alias $as_test
 */
module.exports = function (func, onerror) {
  return function (done) {
    var _this = this;
    var as = new AsyncSteps();
    as.add(function (as) {
      as.add(function (as) {
        func.call(_this, as);
        if (onerror) {
          as.add(function (as) {
            as.error('NegativeTestMustThrow');
          });
        }
      }, onerror);
    }, function (as, err) {
      console.log("ERROR: ".concat(err, " (").concat(as.state.error_info, ")"));
      done(as.state.last_exception || new Error('Generic Fail'));
    });
    as.add(function (as) {
      return done();
    });
    as.execute();
  };
};
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