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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { assertEquals, assertThrows, fail } from "@std/assert/mod.ts";
import { ftruncate, ftruncateSync } from "node:fs";
Deno.test({
name: "ASYNC: no callback function results in Error",
fn() {
assertThrows(
() => {
// @ts-expect-error Argument of type 'number' is not assignable to parameter of type 'NoParamCallback'
ftruncate(123, 0);
},
Error,
"No callback function supplied",
);
},
});
Deno.test({
name: "ASYNC: truncate entire file contents",
async fn() {
const filePath = Deno.makeTempFileSync();
await Deno.writeTextFile(filePath, "hello world");
using file = await Deno.open(filePath, {
read: true,
write: true,
create: true,
});
await new Promise<void>((resolve, reject) => {
ftruncate(file.rid, (err: Error | null) => {
if (err !== null) reject();
else resolve();
});
})
.then(
() => {
const fileInfo: Deno.FileInfo = Deno.lstatSync(filePath);
assertEquals(fileInfo.size, 0);
},
() => {
fail("No error expected");
},
)
.finally(() => {
Deno.removeSync(filePath);
});
},
});
Deno.test({
name: "ASYNC: truncate file to a size of precisely len bytes",
async fn() {
const filePath = Deno.makeTempFileSync();
await Deno.writeTextFile(filePath, "hello world");
using file = await Deno.open(filePath, {
read: true,
write: true,
create: true,
});
await new Promise<void>((resolve, reject) => {
ftruncate(file.rid, 3, (err: Error | null) => {
if (err !== null) reject();
else resolve();
});
})
.then(
() => {
const fileInfo: Deno.FileInfo = Deno.lstatSync(filePath);
assertEquals(fileInfo.size, 3);
},
() => {
fail("No error expected");
},
)
.finally(() => {
Deno.removeSync(filePath);
});
},
});
Deno.test({
name: "SYNC: truncate entire file contents",
fn() {
const filePath = Deno.makeTempFileSync();
Deno.writeFileSync(filePath, new TextEncoder().encode("hello world"));
using file = Deno.openSync(filePath, {
read: true,
write: true,
create: true,
});
try {
ftruncateSync(file.rid);
const fileInfo: Deno.FileInfo = Deno.lstatSync(filePath);
assertEquals(fileInfo.size, 0);
} finally {
Deno.removeSync(filePath);
}
},
});
Deno.test({
name: "SYNC: truncate file to a size of precisely len bytes",
fn() {
const filePath = Deno.makeTempFileSync();
Deno.writeFileSync(filePath, new TextEncoder().encode("hello world"));
using file = Deno.openSync(filePath, {
read: true,
write: true,
create: true,
});
try {
ftruncateSync(file.rid, 3);
const fileInfo: Deno.FileInfo = Deno.lstatSync(filePath);
assertEquals(fileInfo.size, 3);
} finally {
Deno.removeSync(filePath);
}
},
});
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