wehub-resource-sync
71 lines
1.9 KiB
TypeScript
71 lines
1.9 KiB
TypeScript
import { createAsyncIterable } from './create-async-iterable';
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import { getLastValueFromAsyncIterableIterator } from 'nx/src/utils/async-iterator';
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describe(createAsyncIterable.name, () => {
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test('simple callback', async () => {
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const it = createAsyncIterable<string>(({ next, done }) => {
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setTimeout(() => next('bye'), 10);
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setTimeout(() => next('hello'), 0);
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setTimeout(() => done(), 20);
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setTimeout(() => next('ignored'), 30);
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});
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const results: string[] = [];
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for await (const x of it) {
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results.push(x);
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}
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expect(results).toEqual(['hello', 'bye']);
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});
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test('throwing error', async () => {
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const it = createAsyncIterable(({ next, error }) => {
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setTimeout(() => next('hello'), 0);
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setTimeout(() => error(new Error('Oops')), 10);
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});
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await expect(async () => {
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for await (const _x of it) {
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// nothing
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}
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}).rejects.toThrow(/Oops/);
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});
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test('multiple signals in the same macro/microtask', async () => {
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const it = createAsyncIterable<string>(({ next, done }) => {
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setTimeout(() => {
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next('first');
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});
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setTimeout(() => {
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// should pass through in the same macro/microtask
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next('second');
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next('third');
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next('fourth');
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done();
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}, 10);
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setTimeout(() => {
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next('should be ignored');
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}, 20);
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});
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const results: string[] = [];
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for await (const x of it) {
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results.push(x);
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}
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expect(results).toEqual(['first', 'second', 'third', 'fourth']);
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});
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test('works with getLastValueFromAsyncIterableIterator', async () => {
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const it = createAsyncIterable<string>(({ next, done }) => {
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setTimeout(() => {
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next('foo');
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done();
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});
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});
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const result = await getLastValueFromAsyncIterableIterator(it);
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expect(result).toEqual('foo');
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});
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});
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