In-memory FileSystem Writer Necessary for testings.

Changes

2 changed files (+57/-0)

• filesystem_writer/memory_fs.test.ts (new)
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    + // SPDX-FileCopyrightText: 2024 Shota FUJI <pockawoooh@gmail.com> + // + // SPDX-License-Identifier: Apache-2.0 + + import { + assertEquals, + assertExists, + } from "../deps/deno.land/std/assert/mod.ts"; + + import { MemoryFsWriter } from "./memory_fs.ts"; + + Deno.test("Should write to an internal key-value store", async () => { + const writer = new MemoryFsWriter(); + + const content = new TextEncoder().encode("Hello, World!\n"); + + await writer.write(["foo", "bar.txt"], content); + + const wrote = writer.get(["foo", "bar.txt"]); + assertExists(wrote); + + assertEquals( + new TextDecoder().decode(wrote), + "Hello, World!\n", + ); + });
• filesystem_writer/memory_fs.ts (new)
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    + // SPDX-FileCopyrightText: 2024 Shota FUJI <pockawoooh@gmail.com> + // + // SPDX-License-Identifier: Apache-2.0 + + import type { FileSystemWriter, WriteOptions } from "./interface.ts"; + + const SEP = "/"; + + export class MemoryFsWriter implements FileSystemWriter { + #files: Map<string, Uint8Array> = new Map(); + + async write( + path: readonly string[], + content: Uint8Array, + opts: WriteOptions = {}, + ): Promise<void> { + const key = path.join(SEP); + + if (opts.errorOnOverwrite) { + if (this.#files.has(key)) { + throw new Error(`Attempt to overwrite file at "${key}"`); + } + } + + this.#files.set(key, content); + } + + get(path: readonly string[]): Uint8Array | null { + return this.#files.get(path.join(SEP)) ?? null; + } + }