149 lines
3.8 KiB
JavaScript
149 lines
3.8 KiB
JavaScript
import EventTarget from '../../../src/ol/events/Target.js';
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import Observable, {unByKey} from '../../../src/ol/Observable.js';
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describe('ol.Observable', function() {
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describe('constructor', function() {
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it('creates a new observable', function() {
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const observable = new Observable();
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expect(observable).to.be.a(Observable);
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expect(observable).to.be.a(EventTarget);
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});
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});
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describe('#on()', function() {
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let observable, listener;
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beforeEach(function() {
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observable = new Observable();
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listener = sinon.spy();
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});
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it('registers a listener for events of the given type', function() {
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observable.on('foo', listener);
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observable.dispatchEvent('foo');
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expect(listener.calledOnce).to.be(true);
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observable.dispatchEvent('foo');
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expect(listener.callCount).to.be(2);
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});
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it('accepts an array of event types', function() {
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observable.on(['foo', 'bar'], listener);
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observable.dispatchEvent('foo');
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expect(listener.calledOnce).to.be(true);
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observable.dispatchEvent('bar');
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expect(listener.callCount).to.be(2);
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});
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it('returns a listener key', function() {
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const key = observable.on('foo', listener);
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expect(typeof key).to.be('object');
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});
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});
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describe('#once()', function() {
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let observable, listener;
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beforeEach(function() {
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observable = new Observable();
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listener = sinon.spy();
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});
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it('registers a listener that is only called once', function() {
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observable.once('foo', listener);
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observable.dispatchEvent('foo');
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expect(listener.calledOnce).to.be(true);
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observable.dispatchEvent('foo');
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expect(listener.callCount).to.be(1);
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});
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it('is safe to dispatch events of same type in a once listener', function() {
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let callCount = 0;
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observable.once('change', function() {
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observable.changed();
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observable.changed();
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});
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observable.on('change', function() {
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++callCount;
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});
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expect(function() {
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observable.changed();
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}).to.not.throwException();
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expect(callCount).to.be(3);
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});
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it('accepts an array of event types (called once for each)', function() {
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observable.once(['foo', 'bar'], listener);
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observable.dispatchEvent('foo');
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expect(listener.calledOnce).to.be(true);
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observable.dispatchEvent('foo');
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expect(listener.callCount).to.be(1);
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observable.dispatchEvent('bar');
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expect(listener.callCount).to.be(2);
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observable.dispatchEvent('bar');
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expect(listener.callCount).to.be(2);
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});
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it('returns a listener key', function() {
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const key = observable.once('foo', listener);
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expect(typeof key).to.be('object');
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});
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});
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describe('#un()', function() {
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let observable, listener;
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beforeEach(function() {
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observable = new Observable();
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listener = sinon.spy();
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});
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it('unregisters a previously registered listener', function() {
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observable.on('foo', listener);
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observable.dispatchEvent('foo');
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expect(listener.calledOnce).to.be(true);
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observable.un('foo', listener);
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observable.dispatchEvent('foo');
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expect(listener.calledOnce).to.be(true);
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});
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});
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describe('ol.Observable.unByKey()', function() {
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let observable, listener;
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beforeEach(function() {
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observable = new Observable();
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listener = sinon.spy();
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});
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it('unregisters a listener given the key returned by `on`', function() {
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const key = observable.on('foo', listener);
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observable.dispatchEvent('foo');
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expect(listener.calledOnce).to.be(true);
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unByKey(key);
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observable.dispatchEvent('foo');
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expect(listener.callCount).to.be(1);
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});
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});
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});
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