TestScheduler.js
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import { Observable } from '../Observable';
import { Notification } from '../Notification';
import { ColdObservable } from './ColdObservable';
import { HotObservable } from './HotObservable';
import { SubscriptionLog } from './SubscriptionLog';
import { VirtualTimeScheduler, VirtualAction } from '../scheduler/VirtualTimeScheduler';
import { AsyncScheduler } from '../scheduler/AsyncScheduler';
const defaultMaxFrame = 750;
export class TestScheduler extends VirtualTimeScheduler {
constructor(assertDeepEqual) {
super(VirtualAction, defaultMaxFrame);
this.assertDeepEqual = assertDeepEqual;
this.hotObservables = [];
this.coldObservables = [];
this.flushTests = [];
this.runMode = false;
}
createTime(marbles) {
const indexOf = marbles.indexOf('|');
if (indexOf === -1) {
throw new Error('marble diagram for time should have a completion marker "|"');
}
return indexOf * TestScheduler.frameTimeFactor;
}
createColdObservable(marbles, values, error) {
if (marbles.indexOf('^') !== -1) {
throw new Error('cold observable cannot have subscription offset "^"');
}
if (marbles.indexOf('!') !== -1) {
throw new Error('cold observable cannot have unsubscription marker "!"');
}
const messages = TestScheduler.parseMarbles(marbles, values, error, undefined, this.runMode);
const cold = new ColdObservable(messages, this);
this.coldObservables.push(cold);
return cold;
}
createHotObservable(marbles, values, error) {
if (marbles.indexOf('!') !== -1) {
throw new Error('hot observable cannot have unsubscription marker "!"');
}
const messages = TestScheduler.parseMarbles(marbles, values, error, undefined, this.runMode);
const subject = new HotObservable(messages, this);
this.hotObservables.push(subject);
return subject;
}
materializeInnerObservable(observable, outerFrame) {
const messages = [];
observable.subscribe((value) => {
messages.push({ frame: this.frame - outerFrame, notification: Notification.createNext(value) });
}, (err) => {
messages.push({ frame: this.frame - outerFrame, notification: Notification.createError(err) });
}, () => {
messages.push({ frame: this.frame - outerFrame, notification: Notification.createComplete() });
});
return messages;
}
expectObservable(observable, subscriptionMarbles = null) {
const actual = [];
const flushTest = { actual, ready: false };
const subscriptionParsed = TestScheduler.parseMarblesAsSubscriptions(subscriptionMarbles, this.runMode);
const subscriptionFrame = subscriptionParsed.subscribedFrame === Number.POSITIVE_INFINITY ?
0 : subscriptionParsed.subscribedFrame;
const unsubscriptionFrame = subscriptionParsed.unsubscribedFrame;
let subscription;
this.schedule(() => {
subscription = observable.subscribe(x => {
let value = x;
if (x instanceof Observable) {
value = this.materializeInnerObservable(value, this.frame);
}
actual.push({ frame: this.frame, notification: Notification.createNext(value) });
}, (err) => {
actual.push({ frame: this.frame, notification: Notification.createError(err) });
}, () => {
actual.push({ frame: this.frame, notification: Notification.createComplete() });
});
}, subscriptionFrame);
if (unsubscriptionFrame !== Number.POSITIVE_INFINITY) {
this.schedule(() => subscription.unsubscribe(), unsubscriptionFrame);
}
this.flushTests.push(flushTest);
const { runMode } = this;
return {
toBe(marbles, values, errorValue) {
flushTest.ready = true;
flushTest.expected = TestScheduler.parseMarbles(marbles, values, errorValue, true, runMode);
}
};
}
expectSubscriptions(actualSubscriptionLogs) {
const flushTest = { actual: actualSubscriptionLogs, ready: false };
this.flushTests.push(flushTest);
const { runMode } = this;
return {
toBe(marbles) {
const marblesArray = (typeof marbles === 'string') ? [marbles] : marbles;
flushTest.ready = true;
flushTest.expected = marblesArray.map(marbles => TestScheduler.parseMarblesAsSubscriptions(marbles, runMode));
}
};
}
flush() {
const hotObservables = this.hotObservables;
while (hotObservables.length > 0) {
hotObservables.shift().setup();
}
super.flush();
this.flushTests = this.flushTests.filter(test => {
if (test.ready) {
this.assertDeepEqual(test.actual, test.expected);
return false;
}
return true;
});
}
static parseMarblesAsSubscriptions(marbles, runMode = false) {
if (typeof marbles !== 'string') {
return new SubscriptionLog(Number.POSITIVE_INFINITY);
}
const len = marbles.length;
let groupStart = -1;
let subscriptionFrame = Number.POSITIVE_INFINITY;
let unsubscriptionFrame = Number.POSITIVE_INFINITY;
let frame = 0;
for (let i = 0; i < len; i++) {
let nextFrame = frame;
const advanceFrameBy = (count) => {
nextFrame += count * this.frameTimeFactor;
};
const c = marbles[i];
switch (c) {
case ' ':
if (!runMode) {
advanceFrameBy(1);
}
break;
case '-':
advanceFrameBy(1);
break;
case '(':
groupStart = frame;
advanceFrameBy(1);
break;
case ')':
groupStart = -1;
advanceFrameBy(1);
break;
case '^':
if (subscriptionFrame !== Number.POSITIVE_INFINITY) {
throw new Error('found a second subscription point \'^\' in a ' +
'subscription marble diagram. There can only be one.');
}
subscriptionFrame = groupStart > -1 ? groupStart : frame;
advanceFrameBy(1);
break;
case '!':
if (unsubscriptionFrame !== Number.POSITIVE_INFINITY) {
throw new Error('found a second subscription point \'^\' in a ' +
'subscription marble diagram. There can only be one.');
}
unsubscriptionFrame = groupStart > -1 ? groupStart : frame;
break;
default:
if (runMode && c.match(/^[0-9]$/)) {
if (i === 0 || marbles[i - 1] === ' ') {
const buffer = marbles.slice(i);
const match = buffer.match(/^([0-9]+(?:\.[0-9]+)?)(ms|s|m) /);
if (match) {
i += match[0].length - 1;
const duration = parseFloat(match[1]);
const unit = match[2];
let durationInMs;
switch (unit) {
case 'ms':
durationInMs = duration;
break;
case 's':
durationInMs = duration * 1000;
break;
case 'm':
durationInMs = duration * 1000 * 60;
break;
default:
break;
}
advanceFrameBy(durationInMs / this.frameTimeFactor);
break;
}
}
}
throw new Error('there can only be \'^\' and \'!\' markers in a ' +
'subscription marble diagram. Found instead \'' + c + '\'.');
}
frame = nextFrame;
}
if (unsubscriptionFrame < 0) {
return new SubscriptionLog(subscriptionFrame);
}
else {
return new SubscriptionLog(subscriptionFrame, unsubscriptionFrame);
}
}
static parseMarbles(marbles, values, errorValue, materializeInnerObservables = false, runMode = false) {
if (marbles.indexOf('!') !== -1) {
throw new Error('conventional marble diagrams cannot have the ' +
'unsubscription marker "!"');
}
const len = marbles.length;
const testMessages = [];
const subIndex = runMode ? marbles.replace(/^[ ]+/, '').indexOf('^') : marbles.indexOf('^');
let frame = subIndex === -1 ? 0 : (subIndex * -this.frameTimeFactor);
const getValue = typeof values !== 'object' ?
(x) => x :
(x) => {
if (materializeInnerObservables && values[x] instanceof ColdObservable) {
return values[x].messages;
}
return values[x];
};
let groupStart = -1;
for (let i = 0; i < len; i++) {
let nextFrame = frame;
const advanceFrameBy = (count) => {
nextFrame += count * this.frameTimeFactor;
};
let notification;
const c = marbles[i];
switch (c) {
case ' ':
if (!runMode) {
advanceFrameBy(1);
}
break;
case '-':
advanceFrameBy(1);
break;
case '(':
groupStart = frame;
advanceFrameBy(1);
break;
case ')':
groupStart = -1;
advanceFrameBy(1);
break;
case '|':
notification = Notification.createComplete();
advanceFrameBy(1);
break;
case '^':
advanceFrameBy(1);
break;
case '#':
notification = Notification.createError(errorValue || 'error');
advanceFrameBy(1);
break;
default:
if (runMode && c.match(/^[0-9]$/)) {
if (i === 0 || marbles[i - 1] === ' ') {
const buffer = marbles.slice(i);
const match = buffer.match(/^([0-9]+(?:\.[0-9]+)?)(ms|s|m) /);
if (match) {
i += match[0].length - 1;
const duration = parseFloat(match[1]);
const unit = match[2];
let durationInMs;
switch (unit) {
case 'ms':
durationInMs = duration;
break;
case 's':
durationInMs = duration * 1000;
break;
case 'm':
durationInMs = duration * 1000 * 60;
break;
default:
break;
}
advanceFrameBy(durationInMs / this.frameTimeFactor);
break;
}
}
}
notification = Notification.createNext(getValue(c));
advanceFrameBy(1);
break;
}
if (notification) {
testMessages.push({ frame: groupStart > -1 ? groupStart : frame, notification });
}
frame = nextFrame;
}
return testMessages;
}
run(callback) {
const prevFrameTimeFactor = TestScheduler.frameTimeFactor;
const prevMaxFrames = this.maxFrames;
TestScheduler.frameTimeFactor = 1;
this.maxFrames = Number.POSITIVE_INFINITY;
this.runMode = true;
AsyncScheduler.delegate = this;
const helpers = {
cold: this.createColdObservable.bind(this),
hot: this.createHotObservable.bind(this),
flush: this.flush.bind(this),
expectObservable: this.expectObservable.bind(this),
expectSubscriptions: this.expectSubscriptions.bind(this),
};
try {
const ret = callback(helpers);
this.flush();
return ret;
}
finally {
TestScheduler.frameTimeFactor = prevFrameTimeFactor;
this.maxFrames = prevMaxFrames;
this.runMode = false;
AsyncScheduler.delegate = undefined;
}
}
}
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