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concat_stream_providers.test.js
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concat_stream_providers.test.js
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/*
* Licensed to Elasticsearch B.V. under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch B.V. licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import { Readable } from 'stream';
import { concatStreamProviders } from './concat_stream_providers';
import { createListStream } from './list_stream';
import { createConcatStream } from './concat_stream';
import { createPromiseFromStreams } from './promise_from_streams';
describe('concatStreamProviders() helper', () => {
test('writes the data from an array of stream providers into a destination stream in order', async () => {
const results = await createPromiseFromStreams([
concatStreamProviders([
() => createListStream(['foo', 'bar']),
() => createListStream(['baz']),
() => createListStream(['bug']),
]),
createConcatStream(''),
]);
expect(results).toBe('foobarbazbug');
});
test('emits the errors from a sub-stream to the destination', async () => {
const dest = concatStreamProviders([
() => createListStream(['foo', 'bar']),
() =>
new Readable({
read() {
this.destroy(new Error('foo'));
},
}),
]);
const errorListener = jest.fn();
dest.on('error', errorListener);
await expect(createPromiseFromStreams([dest])).rejects.toThrowErrorMatchingInlineSnapshot(
`"foo"`
);
expect(errorListener).toMatchInlineSnapshot(`
[MockFunction] {
"calls": Array [
Array [
[Error: foo],
],
],
"results": Array [
Object {
"isThrow": false,
"value": undefined,
},
],
}
`);
});
});