Docserver: Add FileSystem.Exists method and start sanity checking path format

chrome/common/extensions/docs/server2/file_system_test.py

 #!/usr/bin/env python
 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import unittest
 
 from test_file_system import TestFileSystem
 
 file_system = TestFileSystem({
+  'file.txt': '',
   'templates': {
+    'README': '',
     'public': {
       'apps': {
         '404.html': '',
         'a11y.html': ''
       },
       'extensions': {
         '404.html': '',
         'cookies.html': ''
       },
       'redirects.json': 'redirect'
     },
     'json': {
       'manifest.json': 'manifest'
     }
   }
 })
 
 class FileSystemTest(unittest.TestCase):
   def testWalk(self):
-    expected_files = set([
+    expected_files = [
+      '^/file.txt',
+      'templates/README',
       'templates/public/apps/404.html',
       'templates/public/apps/a11y.html',
       'templates/public/extensions/404.html',
       'templates/public/extensions/cookies.html',
       'templates/public/redirects.json',
       'templates/json/manifest.json'
-    ])
+    ]
 
-    expected_dirs = set([
-      '/templates/',
+    expected_dirs = [
+      '^/templates/',
       'templates/public/',
       'templates/public/apps/',
       'templates/public/extensions/',
       'templates/json/'
-    ])
+    ]
 
-    all_files = set()
-    all_dirs = set()
+    all_files = []
+    all_dirs = []
     for root, dirs, files in file_system.Walk(''):
-      all_files.update(root + '/' + name for name in files)
-      all_dirs.update(root + '/' + name for name in dirs)
+      if not root: root = '^'
+      all_files += [root + '/' + name for name in files]
+      all_dirs += [root + '/' + name for name in dirs]
 
-    self.assertEqual(expected_files, all_files)
-    self.assertEqual(expected_dirs, all_dirs)
+    self.assertEqual(sorted(expected_files), sorted(all_files))
+    self.assertEqual(sorted(expected_dirs), sorted(all_dirs))
 
   def testSubWalk(self):
     expected_files = set([
       '/redirects.json',
       'apps/404.html',
       'apps/a11y.html',
       'extensions/404.html',
       'extensions/cookies.html'
     ])
 
     all_files = set()
-    for root, dirs, files in file_system.Walk('templates/public'):
+    for root, dirs, files in file_system.Walk('templates/public/'):
       all_files.update(root + '/' + name for name in files)
 
     self.assertEqual(expected_files, all_files)
 
+  def testExists(self):
+    def exists(path):
+      return file_system.Exists(path).Get()
+
+    # Root directory.
+    self.assertTrue(exists(''))
+
+    # Directories (are not files).
+    self.assertFalse(exists('templates'))
+    self.assertTrue(exists('templates/'))
+    self.assertFalse(exists('templates/public'))
+    self.assertTrue(exists('templates/public/'))
+    self.assertFalse(exists('templates/public/apps'))
+    self.assertTrue(exists('templates/public/apps/'))
+
+    # Files (are not directories).
+    self.assertTrue(exists('file.txt'))
+    self.assertFalse(exists('file.txt/'))
+    self.assertTrue(exists('templates/README'))
+    self.assertFalse(exists('templates/README/'))
+    self.assertTrue(exists('templates/public/redirects.json'))
+    self.assertFalse(exists('templates/public/redirects.json/'))
+    self.assertTrue(exists('templates/public/apps/a11y.html'))
+    self.assertFalse(exists('templates/public/apps/a11y.html/'))
+
+
 if __name__ == '__main__':
   unittest.main()