Jest reports that test passes even though expect assertion fails

ぃ、小莉子 提交于 2021-01-28 04:33:29

问题


In this code sandbox the following test is executed:

    import { of } from "rxjs";
    import { map } from "rxjs/operators";

    const source = of("World");

    test("It should fail", () => {
      source.subscribe(x => expect(x).toContain("NOTHING"));
    });

Jest reports it as passing, even though the expectation fails. Thoughts?


回答1:


rxjs observables are asynchronous. Take a look at this page to help with testing asynchronous code

You want to add the done argument as below ->

test("It should fail", done => {
  source.subscribe(
    x => {
      expect(x).toContain("NOTHING")
      done();
    });
});


来源:https://stackoverflow.com/questions/53197952/jest-reports-that-test-passes-even-though-expect-assertion-fails

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