typed-utilities/build/__tests__/Deferred.test.js

Strongly typed general purpose utilities

"use strict";

var _ = require("..");

test(`Deferred`, async () => {
  const deferredNull = _.Deferred.defer();

  expect(_.AsyncResult.is.pending(deferredNull.state())).toEqual(true);
  (0, _.sleep)(1000).then(() => deferredNull.resolve(null));
  expect(_.AsyncResult.is.pending(deferredNull.state())).toEqual(true);
  expect(await deferredNull.await()).toEqual(null);
  expect(_.AsyncResult.is.resolved(deferredNull.state())).toEqual(true);
  expect(() => deferredNull.resolve(null)).toThrow();
  expect(() => deferredNull.reject(new Error())).toThrow();

  const deferredError = _.Deferred.defer();

  expect(_.AsyncResult.is.pending(deferredError.state())).toEqual(true);
  (0, _.sleep)(1000).then(() => deferredError.reject(new Error()));
  expect(_.AsyncResult.is.pending(deferredError.state())).toEqual(true);
  await expect(async () => await deferredError.await()).rejects.toBeTruthy();
  expect(_.AsyncResult.is.rejected(deferredError.state())).toEqual(true);
  expect(() => deferredError.resolve(null)).toThrow();
  expect(() => deferredError.reject(new Error())).toThrow();
});
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