Пример #1
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 it('should be false if the argument is undefined or null', () => {
   expect(isPromise(undefined)).toEqual(false);
   expect(isPromise(null)).toEqual(false);
 });
Пример #2
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 () => expect(isPromise({})).toEqual(false));
Пример #3
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 it('should be true for thenables', () => expect(isPromise({then: () => {}})).toEqual(true));
Пример #4
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 () => expect(isPromise({then: 0})).toEqual(false));
Пример #5
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 () => expect(isPromise(Promise.resolve(true))).toEqual(true));