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string_writer_test.ts
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string_writer_test.ts
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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../testing/asserts.ts";
import { StringWriter } from "./string_writer.ts";
import { StringReader } from "./string_reader.ts";
import { copyN } from "./copy_n.ts";
import { copy } from "../streams/copy.ts";
Deno.test("ioStringWriter", async function () {
const w = new StringWriter("base");
const r = new StringReader("0123456789");
await copyN(r, w, 4);
assertEquals(w.toString(), "base0123");
await copy(r, w);
assertEquals(w.toString(), "base0123456789");
});
Deno.test("ioStringWriterSync", function () {
const encoder = new TextEncoder();
const w = new StringWriter("");
w.writeSync(encoder.encode("deno"));
assertEquals(w.toString(), "deno");
w.writeSync(encoder.encode("\nland"));
assertEquals(w.toString(), "deno\nland");
});
Deno.test("ioStringWriterIsolationTest", async function () {
const encoder = new TextEncoder();
const src = "ABC";
const srcChunks = src.split("").map((c) => encoder.encode(c));
const w = new StringWriter();
for (const c of srcChunks) {
const written = await w.write(c);
assertEquals(written, 1);
}
srcChunks[0][0] = 88;
assertEquals(w.toString(), src);
});