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import { expect, describe, it } from "bun:test";
import { Readable, Writable, Duplex, Transform, PassThrough } from "node:stream";
describe("Readable", () => {
it("should be able to be created without _construct method defined", done => {
const readable = new Readable({
read() {
this.push("Hello World!\n");
this.push(null);
},
});
expect(readable instanceof Readable).toBe(true);
let data = "";
readable.on("data", chunk => {
data += chunk.toString();
});
readable.on("end", () => {
expect(data).toBe("Hello World!\n");
done();
});
});
it("should be able to be piped via .pipe", done => {
const readable = new Readable({
read() {
this.push("Hello World!");
this.push(null);
},
});
const writable = new Writable({
write(chunk, encoding, callback) {
expect(chunk.toString()).toBe("Hello World!");
callback();
done();
},
});
readable.pipe(writable);
});
});
describe("Duplex", () => {
it("should allow subclasses to be derived via .call() on class", () => {
function Subclass(opts) {
if (!(this instanceof Subclass)) return new Subclass(opts);
Duplex.call(this, opts);
}
Object.setPrototypeOf(Subclass.prototype, Duplex.prototype);
Object.setPrototypeOf(Subclass, Duplex);
const subclass = new Subclass();
expect(subclass instanceof Duplex).toBe(true);
});
});
describe("Transform", () => {
it("should allow subclasses to be derived via .call() on class", () => {
function Subclass(opts) {
if (!(this instanceof Subclass)) return new Subclass(opts);
Transform.call(this, opts);
}
Object.setPrototypeOf(Subclass.prototype, Transform.prototype);
Object.setPrototypeOf(Subclass, Transform);
const subclass = new Subclass();
expect(subclass instanceof Transform).toBe(true);
});
});
describe("PassThrough", () => {
it("should allow subclasses to be derived via .call() on class", () => {
function Subclass(opts) {
if (!(this instanceof Subclass)) return new Subclass(opts);
PassThrough.call(this, opts);
}
Object.setPrototypeOf(Subclass.prototype, PassThrough.prototype);
Object.setPrototypeOf(Subclass, PassThrough);
const subclass = new Subclass();
expect(subclass instanceof PassThrough).toBe(true);
});
});
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