117 lines
3.1 KiB
TypeScript
117 lines
3.1 KiB
TypeScript
import test from "ava";
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import { expect } from "chai";
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import { Readable } from "stream";
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import { filter } from "../src";
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test.cb("filter() filters elements synchronously", t => {
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t.plan(2);
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const source = new Readable({ objectMode: true });
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const expectedElements = ["a", "c"];
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let i = 0;
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source
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.pipe(
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filter((element: string) => element !== "b", {
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readableObjectMode: true,
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writableObjectMode: true,
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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("filter() filters elements asynchronously", t => {
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t.plan(2);
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const source = new Readable({ objectMode: true });
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const expectedElements = ["a", "c"];
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let i = 0;
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source
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.pipe(
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filter(
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async (element: string) => {
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await Promise.resolve();
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return element !== "b";
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},
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{ readableObjectMode: true, writableObjectMode: true },
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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("filter() emits errors during synchronous filtering", 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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filter(
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(element: string) => {
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if (element !== "a") {
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throw new Error("Failed filtering");
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}
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return true;
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},
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{ readableObjectMode: true, writableObjectMode: true },
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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 filtering");
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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("filter() emits errors during asynchronous filtering", 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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filter(
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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 filtering");
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}
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return true;
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},
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{ readableObjectMode: true, writableObjectMode: true },
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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 filtering");
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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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