deno.land / std@0.166.0 / io / files_test.ts

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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { copy } from "../bytes/mod.ts";import { assert, assertEquals, assertRejects, assertThrows,} from "../testing/asserts.ts";import { readRange, readRangeSync } from "./files.ts";
// N controls how many iterations of certain checks are performed.const N = 100;let testBytes: Uint8Array | null;
export function init() { if (testBytes == null) { testBytes = new Uint8Array(N); for (let i = 0; i < N; i++) { testBytes[i] = "a".charCodeAt(0) + (i % 26); } }}
class MockFile implements Deno.Seeker, Deno.SeekerSync, Deno.Reader, Deno.ReaderSync, Deno.Closer { #buf: Uint8Array; #closed = false; #offset = 0;
get closed() { return this.#closed; }
constructor(buf: Uint8Array) { this.#buf = buf; }
close() { this.#closed = true; }
read(p: Uint8Array): Promise<number | null> { if (this.#offset >= this.#buf.length) { return Promise.resolve(null); } const nread = Math.min(p.length, 16_384, this.#buf.length - this.#offset); if (nread === 0) { return Promise.resolve(0); } copy(this.#buf.subarray(this.#offset, this.#offset + nread), p); this.#offset += nread; return Promise.resolve(nread); }
readSync(p: Uint8Array): number | null { if (this.#offset >= this.#buf.length) { return null; } const nread = Math.min(p.length, 16_384, this.#buf.length - this.#offset); if (nread === 0) { return 0; } copy(this.#buf.subarray(this.#offset, this.#offset + nread), p); this.#offset += nread; return nread; }
seek(offset: number, whence: Deno.SeekMode): Promise<number> { assert(whence === Deno.SeekMode.Start); if (offset >= this.#buf.length) { return Promise.reject(new RangeError("seeked pass end")); } this.#offset = offset; return Promise.resolve(this.#offset); }
seekSync(offset: number, whence: Deno.SeekMode): number { assert(whence === Deno.SeekMode.Start); if (offset >= this.#buf.length) { throw new RangeError("seeked pass end"); } this.#offset = offset; return this.#offset; }}
Deno.test({ name: "readRange", async fn() { init(); assert(testBytes); const file = new MockFile(testBytes); const actual = await readRange(file, { start: 0, end: 9 }); assertEquals(actual, testBytes.subarray(0, 10)); },});
Deno.test({ name: "readRange - invalid range", async fn() { init(); assert(testBytes); const file = new MockFile(testBytes); await assertRejects( async () => { await readRange(file, { start: 100, end: 0 }); }, Error, "Invalid byte range was passed.", ); },});
Deno.test({ name: "readRange - read past EOF", async fn() { init(); assert(testBytes); const file = new MockFile(testBytes); await assertRejects( async () => { await readRange(file, { start: 99, end: 100 }); }, Error, "Unexpected EOF reach while reading a range.", ); },});
Deno.test({ name: "readRangeSync", fn() { init(); assert(testBytes); const file = new MockFile(testBytes); const actual = readRangeSync(file, { start: 0, end: 9 }); assertEquals(actual, testBytes.subarray(0, 10)); },});
Deno.test({ name: "readRangeSync - invalid range", fn() { init(); assert(testBytes); const file = new MockFile(testBytes); assertThrows( () => { readRangeSync(file, { start: 100, end: 0 }); }, Error, "Invalid byte range was passed.", ); },});
Deno.test({ name: "readRangeSync - read past EOF", fn() { init(); assert(testBytes); const file = new MockFile(testBytes); assertThrows( () => { readRangeSync(file, { start: 99, end: 100 }); }, Error, "Unexpected EOF reach while reading a range.", ); },});
std
Deno standard library
GitHub Repositorydenoland/deno_std
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2448

Version Info

Tagged at
2 months ago