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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.import { assertEquals, assertThrows, fail } from "../../testing/asserts.ts";import { ftruncate, ftruncateSync } from "./_fs_ftruncate.ts";
Deno.test({  name: "ASYNC: no callback function results in Error",  fn() {    assertThrows(      () => {        ftruncate(123, 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"));    const { rid } = await Deno.open(file, {      read: true,      write: true,      create: true,    });
    await new Promise<void>((resolve, reject) => {      ftruncate(rid, (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.close(rid);      });  },});
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"));    const { rid } = await Deno.open(file, {      read: true,      write: true,      create: true,    });
    await new Promise<void>((resolve, reject) => {      ftruncate(rid, 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.close(rid);      });  },});
Deno.test({  name: "SYNC: truncate entire file contents",  fn() {    const file: string = Deno.makeTempFileSync();    Deno.writeFileSync(file, new TextEncoder().encode("hello world"));    const { rid } = Deno.openSync(file, {      read: true,      write: true,      create: true,    });
    try {      ftruncateSync(rid);      const fileInfo: Deno.FileInfo = Deno.lstatSync(file);      assertEquals(fileInfo.size, 0);    } finally {      Deno.removeSync(file);      Deno.close(rid);    }  },});
Deno.test({  name: "SYNC: truncate file to a size of precisely len bytes",  fn() {    const file: string = Deno.makeTempFileSync();    Deno.writeFileSync(file, new TextEncoder().encode("hello world"));    const { rid } = Deno.openSync(file, {      read: true,      write: true,      create: true,    });
    try {      ftruncateSync(rid, 3);      const fileInfo: Deno.FileInfo = Deno.lstatSync(file);      assertEquals(fileInfo.size, 3);    } finally {      Deno.removeSync(file);      Deno.close(rid);    }  },});