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import { assertEquals } from "@std/assert";import { pop } from "./pop.ts";
Deno.test("pop", async (t) => {  await t.step(    "returns the next item in the stream or null if the stream is closed",    async () => {      const stream = new ReadableStream<number>({        start(controller) {          controller.enqueue(1);          controller.enqueue(2);          controller.enqueue(3);          controller.close();        },      });      assertEquals(await pop(stream), 1);      assertEquals(await pop(stream), 2);      assertEquals(await pop(stream), 3);      assertEquals(await pop(stream), null);    },  );});