How to use the jest-fetch-mock.mockReject function in jest-fetch-mock
To help you get started, we’ve selected a few jest-fetch-mock examples, based on popular ways it is used in public projects.
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BlueBrain / nexus-js / src / View / ElasticSearchView / __tests__ / ElasticSearchView.spec.ts View on Github 
it('should throw an error if httpPost crashes', async () => {
const view = new ElasticSearchView(
orgLabel,
projectLabel,
mockElasticSearchViewResponse,
);
const message = 'some error message';
mockReject(Error(message));
await expect(view.aggregation(mockAggregationQuery)).rejects.toThrow(
Error,
);
});test('Should have error with invalid url', (done) => {
fetch.mockReject(new Error('Bad Request'));
const component = shallow();
(component.instance() as any).retrieveData().then(() => {
expect(component.state('data')).toEqual([]);
expect(component.state('error')).toBeDefined();
done();
});
});it('should throw an error if httpPost crashes', async () => {
const view = new ElasticSearchView(
orgLabel,
projectLabel,
mockElasticSearchViewResponse,
);
const myQuery = {};
mockReject(new Error('very bad'));
await expect(view.rawQuery(myQuery)).rejects.toThrow(Error);
});
