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map-event-manager.spec.ts
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map-event-manager.spec.ts
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import {type NgZone} from '@angular/core';
import {MapEventManager} from './map-event-manager';
describe('MapEventManager', () => {
let dummyZone: NgZone;
let manager: MapEventManager;
let target: TestEventTarget;
beforeEach(() => {
dummyZone = {
run: jasmine.createSpy('NgZone.run').and.callFake((callback: () => void) => callback()),
} as unknown as NgZone;
target = new TestEventTarget();
manager = new MapEventManager(dummyZone);
});
afterEach(() => {
manager.destroy();
});
it('should register a listener when subscribing to an event', () => {
expect(target.addListener).not.toHaveBeenCalled();
manager.setTarget(target);
const stream = manager.getLazyEmitter('click');
expect(target.addListener).not.toHaveBeenCalled();
expect(target.events.get('click')).toBeFalsy();
const subscription = stream.subscribe();
expect(target.addListener).toHaveBeenCalledTimes(1);
expect(target.events.get('click')?.size).toBe(1);
subscription.unsubscribe();
});
it('should register a listener if the subscription happened before there was a target', () => {
const stream = manager.getLazyEmitter('click');
const subscription = stream.subscribe();
expect(target.addListener).not.toHaveBeenCalled();
expect(target.events.get('click')).toBeFalsy();
manager.setTarget(target);
expect(target.addListener).toHaveBeenCalledTimes(1);
expect(target.events.get('click')?.size).toBe(1);
subscription.unsubscribe();
});
it('should remove the listener when unsubscribing', () => {
const stream = manager.getLazyEmitter('click');
const subscription = stream.subscribe();
manager.setTarget(target);
expect(target.events.get('click')?.size).toBe(1);
subscription.unsubscribe();
expect(target.events.get('click')?.size).toBe(0);
});
it('should remove the listener when the manager is destroyed', () => {
const stream = manager.getLazyEmitter('click');
stream.subscribe();
manager.setTarget(target);
expect(target.events.get('click')?.size).toBe(1);
manager.destroy();
expect(target.events.get('click')?.size).toBe(0);
});
it('should remove the listener when the target is changed', () => {
const stream = manager.getLazyEmitter('click');
stream.subscribe();
manager.setTarget(target);
expect(target.events.get('click')?.size).toBe(1);
manager.setTarget(undefined);
expect(target.events.get('click')?.size).toBe(0);
});
it('should trigger the subscription to an event', () => {
const spy = jasmine.createSpy('subscription');
const stream = manager.getLazyEmitter('click');
stream.subscribe(spy);
manager.setTarget(target);
expect(spy).not.toHaveBeenCalled();
target.triggerListeners('click');
expect(spy).toHaveBeenCalledTimes(1);
});
it('should be able to register multiple listeners to the same event', () => {
const firstSpy = jasmine.createSpy('subscription one');
const secondSpy = jasmine.createSpy('subscription two');
const stream = manager.getLazyEmitter('click');
manager.setTarget(target);
stream.subscribe(firstSpy);
stream.subscribe(secondSpy);
expect(firstSpy).not.toHaveBeenCalled();
expect(secondSpy).not.toHaveBeenCalled();
expect(target.events.get('click')?.size).toBe(2);
target.triggerListeners('click');
expect(firstSpy).toHaveBeenCalledTimes(1);
expect(secondSpy).toHaveBeenCalledTimes(1);
});
it('should run listeners inside the NgZone', () => {
const spy = jasmine.createSpy('subscription');
const stream = manager.getLazyEmitter('click');
stream.subscribe(spy);
manager.setTarget(target);
expect(dummyZone.run).not.toHaveBeenCalled();
target.triggerListeners('click');
expect(dummyZone.run).toHaveBeenCalledTimes(1);
});
it('should maintain subscriptions when swapping out targets', () => {
const spy = jasmine.createSpy('subscription');
const stream = manager.getLazyEmitter('click');
stream.subscribe(spy);
manager.setTarget(target);
expect(spy).not.toHaveBeenCalled();
target.triggerListeners('click');
expect(spy).toHaveBeenCalledTimes(1);
const alternateTarget = new TestEventTarget();
manager.setTarget(alternateTarget);
expect(spy).toHaveBeenCalledTimes(1);
expect(target.events.get('click')?.size).toBe(0);
expect(alternateTarget.events.get('click')?.size).toBe(1);
alternateTarget.triggerListeners('click');
expect(spy).toHaveBeenCalledTimes(2);
manager.setTarget(undefined);
expect(alternateTarget.events.get('click')?.size).toBe(0);
alternateTarget.triggerListeners('click');
expect(spy).toHaveBeenCalledTimes(2);
});
it('should not throw with an invalid target', () => {
manager.setTarget({
addListener: () => undefined,
});
const stream = manager.getLazyEmitter('click');
const completeSpy = jasmine.createSpy('completeSpy');
const errorSpy = jasmine.createSpy('errorSpy');
stream.subscribe({complete: completeSpy, error: errorSpy});
expect(() => manager.destroy()).not.toThrow();
expect(completeSpy).toHaveBeenCalled();
expect(errorSpy).not.toHaveBeenCalled();
});
});
/** Imitates a Google Maps event target and keeps track of the registered events. */
class TestEventTarget {
events = new Map<string, Set<() => void>>();
addListener = jasmine
.createSpy('addListener')
.and.callFake((name: string, listener: () => void) => {
if (!this.events.has(name)) {
this.events.set(name, new Set());
}
this.events.get(name)!.add(listener);
return {remove: () => this.events.get(name)!.delete(listener)};
});
triggerListeners(name: string) {
const listeners = this.events.get(name);
if (!listeners) {
throw Error(`No listeners registered for "${name}" event.`);
}
listeners.forEach(listener => listener());
}
}