javascript jasonbutz.info - 除了Matcher之外的自定义Jest

Posted 2021-05-04

class NullLikeMatcher {
    constructor() {
        this.$$typeof = Symbol.for('jest.asymmetricMatcher');
    }
    asymmetricMatch(value) {
        return value === null || value === undefined;
    }

    toString() {
        return 'NullLike';
    }

    toAsymmetricMatcher() {
        return 'NullLike';
    }
}

expect.nullLike = () => new NullLikeMatcher();