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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// Copyright the Browserify authors. MIT License.// Ported from https://github.com/browserify/path-browserify/import { assertEquals } from "../testing/asserts.ts";import * as path from "./mod.ts";
const slashRE = /\//g;
const pairs = [  ["", ""],  ["/path/to/file", ""],  ["/path/to/file.ext", ".ext"],  ["/path.to/file.ext", ".ext"],  ["/path.to/file", ""],  ["/path.to/.file", ""],  ["/path.to/.file.ext", ".ext"],  ["/path/to/f.ext", ".ext"],  ["/path/to/..ext", ".ext"],  ["/path/to/..", ""],  ["file", ""],  ["file.ext", ".ext"],  [".file", ""],  [".file.ext", ".ext"],  ["/file", ""],  ["/file.ext", ".ext"],  ["/.file", ""],  ["/.file.ext", ".ext"],  [".path/file.ext", ".ext"],  ["file.ext.ext", ".ext"],  ["file.", "."],  [".", ""],  ["./", ""],  [".file.ext", ".ext"],  [".file", ""],  [".file.", "."],  [".file..", "."],  ["..", ""],  ["../", ""],  ["..file.ext", ".ext"],  ["..file", ".file"],  ["..file.", "."],  ["..file..", "."],  ["...", "."],  ["...ext", ".ext"],  ["....", "."],  ["file.ext/", ".ext"],  ["file.ext//", ".ext"],  ["file/", ""],  ["file//", ""],  ["file./", "."],  ["file.//", "."],];
Deno.test("extname", function () {  pairs.forEach(function (p) {    const input = p[0];    const expected = p[1];    assertEquals(expected, path.posix.extname(input));  });
  // On *nix, backslash is a valid name component like any other character.  assertEquals(path.posix.extname(".\\"), "");  assertEquals(path.posix.extname("..\\"), ".\\");  assertEquals(path.posix.extname("file.ext\\"), ".ext\\");  assertEquals(path.posix.extname("file.ext\\\\"), ".ext\\\\");  assertEquals(path.posix.extname("file\\"), "");  assertEquals(path.posix.extname("file\\\\"), "");  assertEquals(path.posix.extname("file.\\"), ".\\");  assertEquals(path.posix.extname("file.\\\\"), ".\\\\");});
Deno.test("extnameWin32", function () {  pairs.forEach(function (p) {    const input = p[0].replace(slashRE, "\\");    const expected = p[1];    assertEquals(expected, path.win32.extname(input));    assertEquals(expected, path.win32.extname("C:" + input));  });
  // On Windows, backslash is a path separator.  assertEquals(path.win32.extname(".\\"), "");  assertEquals(path.win32.extname("..\\"), "");  assertEquals(path.win32.extname("file.ext\\"), ".ext");  assertEquals(path.win32.extname("file.ext\\\\"), ".ext");  assertEquals(path.win32.extname("file\\"), "");  assertEquals(path.win32.extname("file\\\\"), "");  assertEquals(path.win32.extname("file.\\"), ".");  assertEquals(path.win32.extname("file.\\\\"), ".");});