Fix errors in MB when run for the first time on a new builder.

tools/mb/mb_unittest.py

 # Copyright 2015 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.
 
 """Tests for mb.py."""
 
 import json
 import sys
 import unittest
 
 import mb
 
 
 class FakeMBW(mb.MetaBuildWrapper):
   def __init__(self):
     super(FakeMBW, self).__init__()
     self.files = {}
     self.calls = []
+    self.cmds = []

[Dirk Pranke, 2015/06/23 19:54:37]

the stuff related to self.cmds and TempFile() are fixes for unrelated lint
errors.

     self.out = ''
     self.err = ''
     self.platform = 'linux2'
     self.chromium_src_dir = '/fake_src'
     self.default_config = '/fake_src/tools/mb/mb_config.pyl'
 
   def ExpandUser(self, path):
     return '$HOME/%s' % path
 
   def Exists(self, path):
     return self.files.get(path) is not None
 
+  def MaybeMakeDirectory(self, path):
+    pass
+
   def ReadFile(self, path):
     return self.files[path]
 
   def WriteFile(self, path, contents):
     self.files[path] = contents
 
   def Call(self, cmd):
     self.calls.append(cmd)
+    if self.cmds:
+      return self.cmds.pop(0)
     return 0, '', ''
 
   def Print(self, *args, **kwargs):
     sep = kwargs.get('sep', ' ')
     end = kwargs.get('end', '\n')
     f = kwargs.get('file', sys.stdout)
     if f == sys.stderr:
       self.err += sep.join(args) + end
     else:
       self.out += sep.join(args) + end
 
-  def TempFile(self):
+  def TempFile(self, mode='w'):
     return FakeFile(self.files)
 
   def RemoveFile(self, path):
     del self.files[path]
 
 
 class FakeFile(object):
   def __init__(self, files):
     self.name = '/tmp/file'
     self.buf = ''
@@ skipping 117 matching lines @@
     files = {'/tmp/in.json': """{\
                "files": ["foo/foo_unittest.cc"],
                "targets": ["bar_unittests"]
              }"""}
     mbw = self.fake_mbw(files)
     mbw.cmds = [
         (0, '', ''),
         (1, 'The input matches no targets, configs, or files\n', ''),
         (1, 'The input matches no targets, configs, or files\n', ''),
     ]
-    mbw.Call = lambda cmd: mbw.cmds.pop(0)
 
     self.check(['analyze', '-c', 'gn_debug', '//out/Default',
                 '/tmp/in.json', '/tmp/out.json'], mbw=mbw, ret=0)
     out = json.loads(mbw.files['/tmp/out.json'])
     self.assertEqual(out, {
       'build_targets': [],
       'targets': [],
       'status': 'No dependency',
     })
 
@@ skipping 28 matching lines @@
 
   def test_lookup(self):
     self.check(['lookup', '-c', 'gn_debug'], ret=0)
 
   def test_validate(self):
     self.check(['validate'], ret=0)
 
 
 if __name__ == '__main__':
   unittest.main()