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zen-observable
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species.js
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import assert from 'assert'; describe('species', () => { it('uses Observable when constructor is undefined', () => { let instance = new Observable(() => {}); instance.constructor = undefined; assert.ok(instance.map(x => x) instanceof Observable); }); it('uses Observable if species is null', () => { let instance = new Observable(() => {}); instance.constructor = { [Symbol.species]: null }; assert.ok(instance.map(x => x) instanceof Observable); }); it('uses Observable if species is undefined', () => { let instance = new Observable(() => {}); instance.constructor = { [Symbol.species]: undefined }; assert.ok(instance.map(x => x) instanceof Observable); }); it('uses value of Symbol.species', () => { function ctor() {} let instance = new Observable(() => {}); instance.constructor = { [Symbol.species]: ctor }; assert.ok(instance.map(x => x) instanceof ctor); }); });