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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { testPerm, assertEquals, assert } from "./test_util.ts";
function readDataSync(name: string): string {
const data = Deno.readFileSync(name);
const decoder = new TextDecoder("utf-8");
const text = decoder.decode(data);
return text;
}
async function readData(name: string): Promise<string> {
const data = await Deno.readFile(name);
const decoder = new TextDecoder("utf-8");
const text = decoder.decode(data);
return text;
}
testPerm({ read: true, write: true }, function truncateSyncSuccess(): void {
const enc = new TextEncoder();
const d = enc.encode("Hello");
const filename = Deno.makeTempDirSync() + "/test_truncateSync.txt";
Deno.writeFileSync(filename, d);
Deno.truncateSync(filename, 20);
let data = readDataSync(filename);
assertEquals(data.length, 20);
Deno.truncateSync(filename, 5);
data = readDataSync(filename);
assertEquals(data.length, 5);
Deno.truncateSync(filename, -5);
data = readDataSync(filename);
assertEquals(data.length, 0);
Deno.removeSync(filename);
});
testPerm({ read: true, write: true }, async function truncateSuccess(): Promise<
void
> {
const enc = new TextEncoder();
const d = enc.encode("Hello");
const filename = Deno.makeTempDirSync() + "/test_truncate.txt";
await Deno.writeFile(filename, d);
await Deno.truncate(filename, 20);
let data = await readData(filename);
assertEquals(data.length, 20);
await Deno.truncate(filename, 5);
data = await readData(filename);
assertEquals(data.length, 5);
await Deno.truncate(filename, -5);
data = await readData(filename);
assertEquals(data.length, 0);
await Deno.remove(filename);
});
testPerm({ write: false }, function truncateSyncPerm(): void {
let err;
try {
Deno.mkdirSync("/test_truncateSyncPermission.txt");
} catch (e) {
err = e;
}
assert(err instanceof Deno.errors.PermissionDenied);
assertEquals(err.name, "PermissionDenied");
});
testPerm({ write: false }, async function truncatePerm(): Promise<void> {
let err;
try {
await Deno.mkdir("/test_truncatePermission.txt");
} catch (e) {
err = e;
}
assert(err instanceof Deno.errors.PermissionDenied);
assertEquals(err.name, "PermissionDenied");
});
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