108 lines
2.8 KiB
TypeScript
108 lines
2.8 KiB
TypeScript
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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 ".";
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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 expectedElements = ["A", "B", "C"];
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let i = 0;
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source
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.pipe(map((element: string) => 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("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 expectedElements = ["A", "B", "C"];
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let i = 0;
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source
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.pipe(
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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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)
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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() 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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map((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.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("map() emits errors during asynchronous mapping", t => {
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t.plan(1);
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return new Promise((resolve, reject) => {
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const source = new Readable({ objectMode: true });
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source
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.pipe(
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map(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.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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resolve();
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})
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.on("end", () => {
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t.fail();
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});
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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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});
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