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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { unitTest, assertEquals, assert } from "./test_util.ts";
unitTest(
{ perms: { read: true, write: true } },
function truncateSyncSuccess(): void {
const filename = Deno.makeTempDirSync() + "/test_truncateSync.txt";
Deno.writeFileSync(filename, new Uint8Array(5));
Deno.truncateSync(filename, 20);
assertEquals(Deno.readFileSync(filename).byteLength, 20);
Deno.truncateSync(filename, 5);
assertEquals(Deno.readFileSync(filename).byteLength, 5);
Deno.truncateSync(filename, -5);
assertEquals(Deno.readFileSync(filename).byteLength, 0);
Deno.removeSync(filename);
}
);
unitTest(
{ perms: { read: true, write: true } },
async function truncateSuccess(): Promise<void> {
const filename = Deno.makeTempDirSync() + "/test_truncate.txt";
await Deno.writeFile(filename, new Uint8Array(5));
await Deno.truncate(filename, 20);
assertEquals((await Deno.readFile(filename)).byteLength, 20);
await Deno.truncate(filename, 5);
assertEquals((await Deno.readFile(filename)).byteLength, 5);
await Deno.truncate(filename, -5);
assertEquals((await Deno.readFile(filename)).byteLength, 0);
await Deno.remove(filename);
}
);
unitTest({ perms: { write: false } }, function truncateSyncPerm(): void {
let err;
try {
Deno.truncateSync("/test_truncateSyncPermission.txt");
} catch (e) {
err = e;
}
assert(err instanceof Deno.errors.PermissionDenied);
assertEquals(err.name, "PermissionDenied");
});
unitTest({ perms: { write: false } }, async function truncatePerm(): Promise<
void
> {
let err;
try {
await Deno.truncate("/test_truncatePermission.txt");
} catch (e) {
err = e;
}
assert(err instanceof Deno.errors.PermissionDenied);
assertEquals(err.name, "PermissionDenied");
});
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