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denoland-deno/js/files_test.ts

31 lines
929 B
TypeScript

// Copyright 2018 the Deno authors. All rights reserved. MIT license.
import * as deno from "deno";
import { test, assert, assertEqual } from "./test_util.ts";
test(function filesStdioFileDescriptors() {
assertEqual(deno.stdin.rid, 0);
assertEqual(deno.stdout.rid, 1);
assertEqual(deno.stderr.rid, 2);
});
test(async function filesCopyToStdout() {
const filename = "package.json";
const file = await deno.open(filename);
assert(file.rid > 2);
const bytesWritten = await deno.copy(deno.stdout, file);
const fileSize = deno.statSync(filename).len;
assertEqual(bytesWritten, fileSize);
console.log("bytes written", bytesWritten);
});
test(async function filesToAsyncIterator() {
const filename = "tests/hello.txt";
const file = await deno.open(filename);
let totalSize = 0;
for await (const buf of deno.toAsyncIterator(file)) {
totalSize += buf.byteLength;
}
assertEqual(totalSize, 12);
});