index.test.ts

// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.

jest.mock('path');

import path from 'path';
import {replacePathSepForRegex} from '../index';

describe('replacePathSepForRegex()', () => {
  describe('posix', () => {
    beforeEach(() => ((path as any).sep = '/'));

    it('should return the path', () => {
      const expected = {};
      expect(replacePathSepForRegex(expected as any)).toBe(expected);
    });
  });

  describe('win32', () => {
    beforeEach(() => ((path as any).sep = '\\'));

    it('should replace POSIX path separators', () => {
      expect(replacePathSepForRegex('a/b/c')).toBe('a\\\\b\\\\c');

      // When a regular expression is created with a string, not enclosing
      // slashes like "/<pattern>/", the "/" character does not need to be
      // escaped as "\/". The result is the double path separator: "\\"
      expect(replacePathSepForRegex('a\\/b')).toBe('a\\\\\\\\b');
    });

    it('should escape Windows path separators', () => {
      expect(replacePathSepForRegex('a\\b\\c')).toBe('a\\\\b\\\\c');
    });

    it('should not escape an escaped dot', () => {
      expect(replacePathSepForRegex('a\\.dotfile')).toBe('a\\.dotfile');
      expect(replacePathSepForRegex('a\\\\\\.dotfile')).toBe('a\\\\\\.dotfile');
    });

    it('should not escape an escaped regexp symbol', () => {
      expect(replacePathSepForRegex('b\\(86')).toBe('b\\(86');
    });

    it('should escape Windows path separators inside groups', () => {
      expect(replacePathSepForRegex('[/\\\\]')).toBe('[\\\\\\\\]');
    });

    it('should escape Windows path separator at the beginning', () => {
      expect(replacePathSepForRegex('\\a')).toBe('\\\\a');
    });

    it('should not escape several already escaped path separators', () => {
      expect(replacePathSepForRegex('\\\\\\\\')).toBe('\\\\\\\\');
    });
  });
});