Extensions Docs Server: Internal file system

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

+#!/usr/bin/env python
+# Copyright (c) 2012 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 os
+import unittest
+
+import appengine_memcache as memcache
+from in_memory_memcache import InMemoryMemcache
+from local_file_system import LocalFileSystem
+from memcache_file_system import MemcacheFileSystem
+
+class LocalFileSystemTest(unittest.TestCase):
+  def setUp(self):
+    self._file_system = MemcacheFileSystem(
+        LocalFileSystem(os.path.join('test_data', 'file_system')),
+        InMemoryMemcache())
+
+  def testReadFiles(self):
+    expected = {
+      'test1.txt': 'test1\n',
+      'test2.txt': 'test2\n',
+      'test3.txt': 'test3\n',
+    }
+    self.assertEqual(
+        expected,
+        self._file_system.Read(['test1.txt', 'test2.txt', 'test3.txt']).Get())
+
+  def testListDir(self):
+    expected = ['dir/']
+    for i in range(7):
+      expected.append('file%d.html' % i)
+    self.assertEqual(
+        expected,
+        sorted(self._file_system.Read(['list/']).Get()['list/']))
+    (self._file_system._memcache._cache[memcache.MEMCACHE_FILE_SYSTEM_READ]

[not at google - send to devlin, 2012/07/19 03:55:19]

Shoudn't need to access local variables like this. That's why we would hold onto
the memcache ourselves locally, in setUp():

self._memcache = InMemoryMemcache()
self._file_system = ..

then use _memcache here.

However, likewise, don't access private members of it. Either add test-friendly
methods to it, or utilise its interface methods; I think the latter would work
fine in this particular case?

expected.remove('file0.html')
self._memcache.Set('list/', expected, memcache.MEMCACHE_FILE_SYSTEM_READ)

etc.

[cduvall, 2012/07/19 17:18:28]

Done.

+        ['list/'][0].remove('file0.html'))
+    expected.remove('file0.html')
+    self.assertEqual(
+        expected,
+        sorted(self._file_system.Read(['list/']).Get()['list/']))
+

[not at google - send to devlin, 2012/07/19 03:55:19]

In any case, these tests don't really test the point of MemcacheFileSystem, in
that it's supposed to be efficient.

Like, test that if Stat returns the same thing, Read doesn't get called.

For that you might want more of a Mock object, or at least, an object that
records how many times "read" has been called or something.

But I think you should add those kind of tests after we resolve what the
interface to Stat should be.

[cduvall, 2012/07/19 17:18:28]

Ok, sounds good.

+if __name__ == '__main__':
+  unittest.main()