101 lines
2.7 KiB
TypeScript
101 lines
2.7 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 { flatMap } from "../src";
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test.cb("flatMap() maps elements synchronously", t => {
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t.plan(6);
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const source = new Readable({ objectMode: true });
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const expectedElements = ["a", "A", "b", "B", "c", "C"];
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let i = 0;
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source
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.pipe(flatMap((element: string) => [element, element.toUpperCase()]))
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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("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("flatMap() maps elements asynchronously", t => {
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t.plan(6);
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const source = new Readable({ objectMode: true });
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const expectedElements = ["a", "A", "b", "B", "c", "C"];
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let i = 0;
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source
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.pipe(
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flatMap(async (element: string) => {
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await Promise.resolve();
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return [element, element.toUpperCase()];
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}),
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)
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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("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("flatMap() emits errors during synchronous mapping", t => {
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t.plan(2);
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const source = new Readable({ objectMode: true });
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source
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.pipe(
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flatMap((element: string) => {
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if (element !== "a") {
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throw new Error("Failed mapping");
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}
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return [element, element.toUpperCase()];
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}),
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)
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.resume()
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.on("error", err => {
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expect(err.message).to.equal("Failed mapping");
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t.pass();
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})
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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("flatMap() emits errors during asynchronous mapping", t => {
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t.plan(2);
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const source = new Readable({ objectMode: true });
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source
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.pipe(
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flatMap(async (element: string) => {
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await Promise.resolve();
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if (element !== "a") {
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throw new Error("Failed mapping");
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}
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return [element, element.toUpperCase()];
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}),
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)
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.resume()
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.on("error", err => {
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expect(err.message).to.equal("Failed mapping");
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t.pass();
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})
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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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