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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The SFC licenses this file
// to you 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.
'use strict';
const assert = require('assert');
const promise = require('../../lib/promise');
const {enablePromiseManager, promiseManagerSuite} = require('../../lib/test/promise');
describe('promise.consume()', function() {
promiseManagerSuite(() => {
it('requires inputs to be generator functions', function() {
assert.throws(function() {
promise.consume(function() {});
});
});
it('handles a basic generator with no yielded promises', function() {
var values = [];
return promise.consume(function* () {
var i = 0;
while (i < 4) {
i = yield i + 1;
values.push(i);
}
}).then(function() {
assert.deepEqual([1, 2, 3, 4], values);
});
});
it('handles a promise yielding generator', function() {
var values = [];
return promise.consume(function* () {
var i = 0;
while (i < 4) {
// Test that things are actually async here.
setTimeout(function() {
values.push(i * 2);
}, 10);
yield promise.delayed(10).then(function() {
values.push(i++);
});
}
}).then(function() {
assert.deepEqual([0, 0, 2, 1, 4, 2, 6, 3], values);
});
});
it('assignments to yielded promises get fulfilled value', function() {
return promise.consume(function* () {
let x = yield Promise.resolve(2);
assert.equal(2, x);
});
});
it('uses final return value as fulfillment value', function() {
return promise.consume(function* () {
yield 1;
yield 2;
return 3;
}).then(function(value) {
assert.equal(3, value);
});
});
it('throws rejected promise errors within the generator', function() {
var values = [];
return promise.consume(function* () {
values.push('a');
var e = Error('stub error');
try {
yield Promise.reject(e);
values.push('b');
} catch (ex) {
assert.equal(e, ex);
values.push('c');
}
values.push('d');
}).then(function() {
assert.deepEqual(['a', 'c', 'd'], values);
});
});
it('aborts the generator if there is an unhandled rejection', function() {
var values = [];
var e = Error('stub error');
return promise.consume(function* () {
values.push(1);
yield promise.rejected(e);
values.push(2);
}).catch(function() {
assert.deepEqual([1], values);
});
});
it('yield waits for promises', function() {
let values = [];
let blocker = promise.delayed(100).then(() => {
assert.deepEqual([1], values);
return 2;
});
return promise.consume(function* () {
values.push(1);
values.push(yield blocker, 3);
}).then(function() {
assert.deepEqual([1, 2, 3], values);
});
});
it('accepts custom scopes', function() {
return promise.consume(function* () {
return this.name;
}, {name: 'Bob'}).then(function(value) {
assert.equal('Bob', value);
});
});
it('accepts initial generator arguments', function() {
return promise.consume(function* (a, b) {
assert.equal('red', a);
assert.equal('apples', b);
}, null, 'red', 'apples');
});
});
enablePromiseManager(() => {
it('is possible to cancel promise generators', function() {
var values = [];
var p = promise.consume(function* () {
var i = 0;
while (i < 3) {
yield promise.delayed(100).then(function() {
values.push(i++);
});
}
});
return promise.delayed(75).then(function() {
p.cancel();
return p.catch(function() {
return promise.delayed(300);
});
}).then(function() {
assert.deepEqual([0], values);
});
});
it('executes generator within the control flow', function() {
var promises = [
promise.defer(),
promise.defer()
];
var values = [];
setTimeout(function() {
assert.deepEqual([], values);
promises[0].fulfill(1);
}, 100);
setTimeout(function() {
assert.deepEqual([1], values);
promises[1].fulfill(2);
}, 200);
return promise.controlFlow().execute(function* () {
values.push(yield promises[0].promise);
values.push(yield promises[1].promise);
values.push('fin');
}).then(function() {
assert.deepEqual([1, 2, 'fin'], values);
});
});
it('handles tasks scheduled in generator', function() {
var flow = promise.controlFlow();
return flow.execute(function* () {
var x = yield flow.execute(function() {
return promise.delayed(10).then(function() {
return 1;
});
});
var y = yield flow.execute(function() {
return 2;
});
return x + y;
}).then(function(value) {
assert.equal(3, value);
});
});
it('blocks the control flow while processing generator', function() {
var values = [];
return promise.controlFlow().wait(function* () {
yield values.push(1);
values.push(yield promise.delayed(10).then(function() {
return 2;
}));
yield values.push(3);
return values.length === 6;
}, 250).then(function() {
assert.deepEqual([1, 2, 3, 1, 2, 3], values);
});
});
it('ControlFlow.wait() will timeout on long generator', function() {
var values = [];
return promise.controlFlow().wait(function* () {
var i = 0;
while (i < 3) {
yield promise.delayed(100).then(function() {
values.push(i++);
});
}
}, 75).catch(function() {
assert.deepEqual(
[0, 1, 2], values, 'Should complete one loop of wait condition');
});
});
describe('generators in promise callbacks', function() {
it('works with no initial value', function() {
var promises = [
promise.defer(),
promise.defer()
];
var values = [];
setTimeout(function() {
promises[0].fulfill(1);
}, 50);
setTimeout(function() {
promises[1].fulfill(2);
}, 100);
return promise.fulfilled().then(function*() {
values.push(yield promises[0].promise);
values.push(yield promises[1].promise);
values.push('fin');
}).then(function() {
assert.deepEqual([1, 2, 'fin'], values);
});
});
it('starts the generator with promised value', function() {
var promises = [
promise.defer(),
promise.defer()
];
var values = [];
setTimeout(function() {
promises[0].fulfill(1);
}, 50);
setTimeout(function() {
promises[1].fulfill(2);
}, 100);
return promise.fulfilled(3).then(function*(value) {
var p1 = yield promises[0].promise;
var p2 = yield promises[1].promise;
values.push(value + p1);
values.push(value + p2);
values.push('fin');
}).then(function() {
assert.deepEqual([4, 5, 'fin'], values);
});
});
it('throws yielded rejections within the generator callback', function() {
var d = promise.defer();
var e = Error('stub');
setTimeout(function() {
d.reject(e);
}, 50);
return promise.fulfilled().then(function*() {
var threw = false;
try {
yield d.promise;
} catch (ex) {
threw = true;
assert.equal(e, ex);
}
assert.ok(threw);
});
});
});
});
});
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