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35 lines
1.1 KiB
JavaScript
35 lines
1.1 KiB
JavaScript
import { addEventListener } from '../src';
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import TargetEventHandlers from '../src/TargetEventHandlers';
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class MockTarget {
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constructor() {
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this.addEventListener = jest.fn();
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}
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}
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const EVENT_HANDLERS_KEY = '__consolidated_events_handlers__';
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describe('addEventListener()', () => {
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it('initializes an instance of TargetEventHandlers on new targets', () => {
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const target = new MockTarget();
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addEventListener(target, 'scroll', () => {});
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expect(target[EVENT_HANDLERS_KEY]).toBeInstanceOf(TargetEventHandlers);
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expect(target[EVENT_HANDLERS_KEY].target).toBe(target);
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});
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it('normalizes event options', () => {
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const target = new MockTarget();
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addEventListener(target, 'scroll', () => {}, { capture: true });
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expect(target.addEventListener)
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.toHaveBeenCalledWith('scroll', jasmine.any(Function), true);
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});
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it('returns an unsubscribe function', () => {
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const target = new MockTarget();
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const remove = addEventListener(target, 'scroll', () => {}, { capture: true });
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expect(typeof remove).toBe('function');
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});
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});
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