52 lines
1.3 KiB
TypeScript
52 lines
1.3 KiB
TypeScript
import { Readable } from "stream";
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import test from "ava";
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import { expect } from "chai";
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import { map } from "../src";
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test.cb("map() maps elements synchronously", t => {
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t.plan(3);
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const source = new Readable({ objectMode: true });
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const mapStream = map((element: string) => element.toUpperCase());
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const expectedElements = ["A", "B", "C"];
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let i = 0;
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source
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.pipe(mapStream)
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.on("data", (element: string) => {
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expect(element).to.equal(expectedElements[i]);
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t.pass();
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i++;
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})
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.on("error", t.end)
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.on("end", t.end);
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source.push("a");
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source.push("b");
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source.push("c");
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source.push(null);
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});
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test.cb("map() maps elements asynchronously", t => {
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t.plan(3);
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const source = new Readable({ objectMode: true });
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const mapStream = map(async (element: string) => {
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await Promise.resolve();
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return element.toUpperCase();
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});
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const expectedElements = ["A", "B", "C"];
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let i = 0;
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source
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.pipe(mapStream)
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.on("data", (element: string) => {
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expect(element).to.equal(expectedElements[i]);
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t.pass();
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i++;
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})
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.on("error", t.end)
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.on("end", t.end);
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source.push("a");
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source.push("b");
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source.push("c");
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source.push(null);
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});
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