Fix crash in source_package.py

lib/naclports/tests/test_source_package.py

 # Copyright 2014 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from mock import patch, Mock
 import mock
 import tempfile
 import textwrap
 import shutil
 import os
@@ skipping 79 matching lines @@
     root = self.CreateTestPackage('foo')
     pkg = source_package.SourcePackage(root)
     pkg.Build(True)
 
   def testSourcePackageIterator(self):
     self.CreateTestPackage('foo')
     pkgs = [p for p in source_package.SourcePackageIterator()]
     self.assertEqual(len(pkgs), 1)
     self.assertEqual(pkgs[0].NAME, 'foo')
 
+  def testGetInstalledPackage(self):
+    root = self.CreateTestPackage('foo')
+    pkg = source_package.SourcePackage(root)
+    with self.assertRaisesRegexp(error.Error, 'package not installed: foo'):
+      pkg.GetInstalledPackage()
+
   def testGetBuildLocation(self):
     root = self.CreateTestPackage('foo')
     pkg = source_package.SourcePackage(root)
     location = pkg.GetBuildLocation()
     self.assertTrue(location.startswith(paths.BUILD_ROOT))
     self.assertEqual(os.path.basename(location), '%s-%s' %
                      (pkg.NAME, pkg.VERSION))
 
   @patch('naclports.util.Log', Mock())
   def testExtract(self):
@@ skipping 159 matching lines @@
     expected_filename = os.path.join(paths.CACHE_ROOT, 'bar.tar.gz')
     mock_download.assert_called_once_with(expected_filename, mock.ANY)
     mock_verify.assert_called_once_with(expected_filename, 'X123')
 
   @patch('naclports.util.DownloadFile')
   def testDownloadMissingSHA1(self, mock_download):
     self.CreateTestPackage('foo', 'URL=foo/bar')
     pkg = source_package.CreatePackage('foo')
     with self.assertRaisesRegexp(error.Error, 'missing SHA1 attribute'):
       pkg.Download()