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limited_transform_stream_test.ts
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limited_transform_stream_test.ts
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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { assertEquals, assertRejects } from "../testing/asserts.ts";
import { LimitedTransformStream } from "./limited_transform_stream.ts";
Deno.test("[streams] LimitedTransformStream", async function () {
const r = new ReadableStream({
start(controller) {
controller.enqueue("foo");
controller.enqueue("foo");
controller.enqueue("foo");
controller.enqueue("foo");
controller.enqueue("foo");
controller.enqueue("foo");
controller.close();
},
});
const chunks = [];
for await (const chunk of r.pipeThrough(new LimitedTransformStream(3))) {
chunks.push(chunk);
}
assertEquals(chunks.length, 3);
});
Deno.test("[streams] LimitedTransformStream error", async function () {
const r = new ReadableStream({
start(controller) {
controller.enqueue("foo");
controller.enqueue("foo");
controller.enqueue("foo");
controller.enqueue("foo");
controller.enqueue("foo");
controller.enqueue("foo");
controller.close();
},
});
await assertRejects(async () => {
for await (
const _chunk of r.pipeThrough(
new LimitedTransformStream(3, { error: true }),
)
) {
// needed to read
}
}, RangeError);
});