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_fs_truncate_test.ts
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_fs_truncate_test.ts
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { assertEquals, assertThrows, fail } from "../../testing/asserts.ts";
import { truncate, truncateSync } from "./_fs_truncate.ts";
Deno.test({
name: "ASYNC: no callback function results in Error",
fn() {
assertThrows(
() => {
truncate("some/path", 0);
},
Error,
"No callback function supplied",
);
},
});
Deno.test({
name: "ASYNC: truncate entire file contents",
async fn() {
const file: string = Deno.makeTempFileSync();
await Deno.writeFile(file, new TextEncoder().encode("hello world"));
await new Promise<void>((resolve, reject) => {
truncate(file, (err: Error | null) => {
if (err !== null) reject();
else resolve();
});
})
.then(
() => {
const fileInfo: Deno.FileInfo = Deno.lstatSync(file);
assertEquals(fileInfo.size, 0);
},
() => {
fail("No error expected");
},
)
.finally(() => Deno.removeSync(file));
},
});
Deno.test({
name: "ASYNC: truncate file to a size of precisely len bytes",
async fn() {
const file: string = Deno.makeTempFileSync();
await Deno.writeFile(file, new TextEncoder().encode("hello world"));
await new Promise<void>((resolve, reject) => {
truncate(file, 3, (err: Error | null) => {
if (err !== null) reject();
else resolve();
});
})
.then(
() => {
const fileInfo: Deno.FileInfo = Deno.lstatSync(file);
assertEquals(fileInfo.size, 3);
},
() => {
fail("No error expected");
},
)
.finally(() => Deno.removeSync(file));
},
});
Deno.test({
name: "SYNC: truncate entire file contents",
fn() {
const file: string = Deno.makeTempFileSync();
try {
truncateSync(file);
const fileInfo: Deno.FileInfo = Deno.lstatSync(file);
assertEquals(fileInfo.size, 0);
} finally {
Deno.removeSync(file);
}
},
});
Deno.test({
name: "SYNC: truncate file to a size of precisely len bytes",
fn() {
const file: string = Deno.makeTempFileSync();
try {
truncateSync(file, 3);
const fileInfo: Deno.FileInfo = Deno.lstatSync(file);
assertEquals(fileInfo.size, 3);
} finally {
Deno.removeSync(file);
}
},
});