diff --git a/include/gmock/internal/gmock-port.h b/include/gmock/internal/gmock-port.h
index 1bd455b..0cff73f 100644
--- a/include/gmock/internal/gmock-port.h
+++ b/include/gmock/internal/gmock-port.h
@@ -81,39 +81,22 @@
 #error "At least Visual C++ 2003 (7.1) is required to compile Google Mock."
 #endif
 
-// Use implicit_cast as a safe version of static_cast or const_cast
-// for upcasting in the type hierarchy (i.e. casting a pointer to Foo
-// to a pointer to SuperclassOfFoo or casting a pointer to Foo to
-// a const pointer to Foo).
-// When you use implicit_cast, the compiler checks that the cast is safe.
-// Such explicit implicit_casts are necessary in surprisingly many
-// situations where C++ demands an exact type match instead of an
-// argument type convertable to a target type.
+// Use implicit_cast as a safe version of static_cast for upcasting in
+// the type hierarchy (e.g. casting a Foo* to a SuperclassOfFoo* or a
+// const Foo*).  When you use implicit_cast, the compiler checks that
+// the cast is safe.  Such explicit implicit_casts are necessary in
+// surprisingly many situations where C++ demands an exact type match
+// instead of an argument type convertable to a target type.
 //
-// The From type can be inferred, so the preferred syntax for using
-// implicit_cast is the same as for static_cast etc.:
+// The syntax for using implicit_cast is the same as for static_cast:
 //
 //   implicit_cast<ToType>(expr)
 //
 // implicit_cast would have been part of the C++ standard library,
 // but the proposal was submitted too late.  It will probably make
 // its way into the language in the future.
-template<typename To, typename From>
-inline To implicit_cast(const From& f) {
-  return f;
-}
-// Nokia's compiler can't tell which version of implicit_cast to use when
-// the source is a const, causing the compilation to fail with the error
-// "ambiguous access to overloaded function". So we only support the const
-// version of implicit_cast on Symbian.
-#if !GTEST_OS_SYMBIAN
-// This overload is needed in case the From type has a non-const type
-// conversion operator to type To.
-template<typename To, typename From>
-inline To implicit_cast(From& f) {
-  return f;
-}
-#endif
+template<typename To>
+inline To implicit_cast(To x) { return x; }
 
 // When you upcast (that is, cast a pointer from type Foo to type
 // SuperclassOfFoo), it's fine to use implicit_cast<>, since upcasts
@@ -139,7 +122,8 @@
   // optimized build at run-time, as it will be optimized away
   // completely.
   if (false) {
-    implicit_cast<From*, To>(0);
+    const To to = NULL;
+    implicit_cast<From*>(to);
   }
 
 #if GTEST_HAS_RTTI
diff --git a/run_tests.py b/run_tests.py
new file mode 100755
index 0000000..42dc14b
--- /dev/null
+++ b/run_tests.py
@@ -0,0 +1,82 @@
+#!/usr/bin/env python
+#
+# Copyright 2008, Google Inc. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Runs the specified tests for Google Mock.
+
+This script requires Python 2.3 or higher.  To learn the usage, run it
+with -h.
+"""
+
+__author__ = 'vladl@google.com (Vlad Losev)'
+
+
+import os
+import sys
+
+SCRIPT_DIR = os.path.dirname(__file__) or '.'
+
+# Path to the Google Test code this Google Mock will use.  We assume the
+# gtest/ directory is either a subdirectory (possibly via a symbolic link)
+# of gmock/ or a sibling.
+#
+# isdir resolves symbolic links.
+if os.path.isdir(os.path.join(SCRIPT_DIR, 'gtest/test')):
+  RUN_TESTS_UTIL_DIR = os.path.join(SCRIPT_DIR, 'gtest/test')
+else:
+  RUN_TESTS_UTIL_DIR = os.path.join(SCRIPT_DIR, '../gtest/test')
+
+sys.path.append(RUN_TESTS_UTIL_DIR)
+import run_tests_util
+
+def GetGmockBuildDir(injected_os, script_dir, config):
+  return injected_os.path.normpath(injected_os.path.join(script_dir,
+                                                         'scons/build',
+                                                         config,
+                                                         'gmock/scons'))
+
+
+def _Main():
+  """Runs all tests for Google Mock."""
+
+  options, args = run_tests_util.ParseArgs('gtest')
+  test_runner = run_tests_util.TestRunner(
+      script_dir=SCRIPT_DIR,
+      build_dir_var_name='GMOCK_BUILD_DIR',
+      injected_build_dir_finder=GetGmockBuildDir)
+  tests = test_runner.GetTestsToRun(args,
+                                    options.configurations,
+                                    options.built_configurations)
+  if not tests:
+    sys.exit(1)  # Incorrect parameters given, abort execution.
+
+  sys.exit(test_runner.RunTests(tests[0], tests[1]))
+
+if __name__ == '__main__':
+  _Main()
diff --git a/scripts/gmock_doctor.py b/scripts/gmock_doctor.py
index d21b9ee..74af108 100755
--- a/scripts/gmock_doctor.py
+++ b/scripts/gmock_doctor.py
@@ -340,11 +340,11 @@
   regex = ('instantiated from \'testing::internal::ReturnAction<R>'
            '::operator testing::Action<Func>\(\) const.*\n' +
            _FILE_LINE_RE + r'instantiated from here\n'
-           r'.*gmock-port\.h.*error: invalid conversion from '
-           r'\'long int\' to \'(?P<type>.+\*)')
+           r'.*error: no matching function for call to \'implicit_cast\('
+           r'long int&\)')
   diagnosis = """
 You are probably calling Return(NULL) and the compiler isn't sure how to turn
-NULL into a %(type)s*. Use ReturnNull() instead.
+NULL into the right type. Use ReturnNull() instead.
 Note: the line number may be off; please fix all instances of Return(NULL)."""
   return _GenericDiagnoser('NRNULL', 'Need to use ReturnNull',
                            regex, diagnosis, msg)
diff --git a/test/gmock-actions_test.cc b/test/gmock-actions_test.cc
index e2b1d05..1be4a16 100644
--- a/test/gmock-actions_test.cc
+++ b/test/gmock-actions_test.cc
@@ -545,9 +545,6 @@
                           << "when performed." ;
 }
 
-// We do not support non-const type conversions on Symbian. See
-// definition of implicit_cast in gmock-port.h for more information.
-#if !GTEST_OS_SYMBIAN
 class DestinationType {};
 
 class SourceType {
@@ -560,7 +557,6 @@
   SourceType s;
   Action<DestinationType()> action(Return(s));
 }
-#endif  // !GTEST_OS_SYMBIAN
 
 // Tests that ReturnNull() returns NULL in a pointer-returning function.
 TEST(ReturnNullTest, WorksInPointerReturningFunction) {
diff --git a/test/gmock-port_test.cc b/test/gmock-port_test.cc
index 3d983d5..b2afb93 100644
--- a/test/gmock-port_test.cc
+++ b/test/gmock-port_test.cc
@@ -76,10 +76,6 @@
   EXPECT_EQ(derived.member(), base.member());
 }
 
-// The non-const version is not enabled for Symbian since the Nokia compiler
-// cannot decide which version of the overloaded implicit_cast method to use
-// when the source is a const.
-#if !GTEST_OS_SYMBIAN
 class Castable {
  public:
   Castable(bool* converted) : converted_(converted) {}
@@ -98,7 +94,6 @@
   Base base = ::testing::internal::implicit_cast<Base>(castable);
   EXPECT_TRUE(converted);
 }
-#endif  // !GTEST_OS_SYMBIAN
 
 class ConstCastable {
  public:
@@ -119,10 +114,6 @@
   EXPECT_TRUE(converted);
 }
 
-// The non-const version is not enabled for Symbian since the Nokia compiler
-// cannot decide which version of the overloaded implicit_cast method to use
-// when the source is a const.
-#if !GTEST_OS_SYMBIAN
 class ConstAndNonConstCastable {
  public:
   ConstAndNonConstCastable(bool* converted, bool* const_converted)
@@ -156,7 +147,6 @@
   EXPECT_FALSE(converted);
   EXPECT_TRUE(const_converted);
 }
-#endif  // !GTEST_OS_SYMBIAN
 
 class To {
  public:
diff --git a/test/gmock_leak_test.py b/test/gmock_leak_test.py
index 1337e0b..429cc6a 100755
--- a/test/gmock_leak_test.py
+++ b/test/gmock_leak_test.py
@@ -33,51 +33,59 @@
 
 __author__ = 'wan@google.com (Zhanyong Wan)'
 
-import gmock_test_utils
 import os
 import unittest
 
-IS_WINDOWS = os.name == 'nt'
+import gmock_test_utils
 
-if IS_WINDOWS:
-  # TODO(wan@google.com): test the opt build too.  We should do it
-  # when Vlad Losev's work on Google Test's Python test driver is
-  # done, such that we can reuse the work.
-  PROGRAM = r'..\build.dbg\gmock_leak_test_.exe'
-else:
-  PROGRAM = 'gmock_leak_test_'
 
-PROGRAM_PATH = os.path.join(gmock_test_utils.GetBuildDir(), PROGRAM)
-TEST_WITH_EXPECT_CALL = PROGRAM_PATH + ' --gtest_filter=*ExpectCall*'
-TEST_WITH_ON_CALL = PROGRAM_PATH + ' --gtest_filter=*OnCall*'
-TEST_MULTIPLE_LEAKS = PROGRAM_PATH + ' --gtest_filter=*MultipleLeaked*'
+PROGRAM_PATH = gmock_test_utils.GetTestExecutablePath('gmock_leak_test_')
+TEST_WITH_EXPECT_CALL = [PROGRAM_PATH, '--gtest_filter=*ExpectCall*']
+TEST_WITH_ON_CALL = [PROGRAM_PATH, '--gtest_filter=*OnCall*']
+TEST_MULTIPLE_LEAKS = [PROGRAM_PATH, '--gtest_filter=*MultipleLeaked*']
 
 
 class GMockLeakTest(unittest.TestCase):
 
   def testCatchesLeakedMockByDefault(self):
-    self.assertNotEqual(os.system(TEST_WITH_EXPECT_CALL), 0)
-    self.assertNotEqual(os.system(TEST_WITH_ON_CALL), 0)
+    self.assertNotEqual(
+        0,
+        gmock_test_utils.Subprocess(TEST_WITH_EXPECT_CALL).exit_code)
+    self.assertNotEqual(
+        0,
+        gmock_test_utils.Subprocess(TEST_WITH_ON_CALL).exit_code)
 
   def testDoesNotCatchLeakedMockWhenDisabled(self):
     self.assertEquals(
-        0, os.system(TEST_WITH_EXPECT_CALL + ' --gmock_catch_leaked_mocks=0'))
+        0,
+        gmock_test_utils.Subprocess(TEST_WITH_EXPECT_CALL +
+                                    ['--gmock_catch_leaked_mocks=0']).exit_code)
     self.assertEquals(
-        0, os.system(TEST_WITH_ON_CALL + ' --gmock_catch_leaked_mocks=0'))
+        0,
+        gmock_test_utils.Subprocess(TEST_WITH_ON_CALL +
+                                    ['--gmock_catch_leaked_mocks=0']).exit_code)
 
   def testCatchesLeakedMockWhenEnabled(self):
     self.assertNotEqual(
-        os.system(TEST_WITH_EXPECT_CALL + ' --gmock_catch_leaked_mocks'), 0)
+        0,
+        gmock_test_utils.Subprocess(TEST_WITH_EXPECT_CALL +
+                                    ['--gmock_catch_leaked_mocks']).exit_code)
     self.assertNotEqual(
-        os.system(TEST_WITH_ON_CALL + ' --gmock_catch_leaked_mocks'), 0)
+        0,
+        gmock_test_utils.Subprocess(TEST_WITH_ON_CALL +
+                                    ['--gmock_catch_leaked_mocks']).exit_code)
 
   def testCatchesLeakedMockWhenEnabledWithExplictFlagValue(self):
     self.assertNotEqual(
-        os.system(TEST_WITH_EXPECT_CALL + ' --gmock_catch_leaked_mocks=1'), 0)
+        0,
+        gmock_test_utils.Subprocess(TEST_WITH_EXPECT_CALL +
+                                    ['--gmock_catch_leaked_mocks=1']).exit_code)
 
   def testCatchesMultipleLeakedMocks(self):
     self.assertNotEqual(
-        os.system(TEST_MULTIPLE_LEAKS + ' --gmock_catch_leaked_mocks'), 0)
+        0,
+        gmock_test_utils.Subprocess(TEST_MULTIPLE_LEAKS +
+                                    ['--gmock_catch_leaked_mocks']).exit_code)
 
 
 if __name__ == '__main__':
diff --git a/test/gmock_output_test.py b/test/gmock_output_test.py
index f43f707..c5f05b3 100755
--- a/test/gmock_output_test.py
+++ b/test/gmock_output_test.py
@@ -40,29 +40,21 @@
 
 __author__ = 'wan@google.com (Zhanyong Wan)'
 
-import gmock_test_utils
 import os
 import re
-import string
 import sys
 import unittest
 
+import gmock_test_utils
+
 
 # The flag for generating the golden file
 GENGOLDEN_FLAG = '--gengolden'
 
-IS_WINDOWS = os.name == 'nt'
-
-if IS_WINDOWS:
-  PROGRAM = r'..\build.dbg\gmock_output_test_.exe'
-else:
-  PROGRAM = 'gmock_output_test_'
-
-PROGRAM_PATH = os.path.join(gmock_test_utils.GetBuildDir(), PROGRAM)
-COMMAND = PROGRAM_PATH + ' --gtest_stack_trace_depth=0 --gtest_print_time=0'
+PROGRAM_PATH = gmock_test_utils.GetTestExecutablePath('gmock_output_test_')
+COMMAND = [PROGRAM_PATH, '--gtest_stack_trace_depth=0', '--gtest_print_time=0']
 GOLDEN_NAME = 'gmock_output_test_golden.txt'
-GOLDEN_PATH = os.path.join(gmock_test_utils.GetSourceDir(),
-                           GOLDEN_NAME)
+GOLDEN_PATH = os.path.join(gmock_test_utils.GetSourceDir(), GOLDEN_NAME)
 
 
 def ToUnixLineEnding(s):
@@ -144,51 +136,10 @@
   return (RemoveTestNamesOfLeakedMocks(output), GetLeakyTests(output))
 
 
-def IterShellCommandOutput(cmd, stdin_string=None):
-  """Runs a command in a sub-process, and iterates the lines in its STDOUT.
+def GetShellCommandOutput(cmd):
+  """Runs a command in a sub-process, and returns its STDOUT in a string."""
 
-  Args:
-
-    cmd:           The shell command.
-    stdin_string:  The string to be fed to the STDIN of the sub-process;
-                   If None, the sub-process will inherit the STDIN
-                   from the parent process.
-  """
-
-  # Spawns cmd in a sub-process, and gets its standard I/O file objects.
-  stdin_file, stdout_file = os.popen2(cmd, 'b')
-
-  # If the caller didn't specify a string for STDIN, gets it from the
-  # parent process.
-  if stdin_string is None:
-    stdin_string = sys.stdin.read()
-
-  # Feeds the STDIN string to the sub-process.
-  stdin_file.write(stdin_string)
-  stdin_file.close()
-
-  while True:
-    line = stdout_file.readline()
-    if not line:  # EOF
-      stdout_file.close()
-      break
-
-    yield line
-
-
-def GetShellCommandOutput(cmd, stdin_string=None):
-  """Runs a command in a sub-process, and returns its STDOUT in a string.
-
-  Args:
-
-    cmd:           The shell command.
-    stdin_string:  The string to be fed to the STDIN of the sub-process;
-                   If None, the sub-process will inherit the STDIN
-                   from the parent process.
-  """
-
-  lines = list(IterShellCommandOutput(cmd, stdin_string))
-  return string.join(lines, '')
+  return gmock_test_utils.Subprocess(cmd, capture_stderr=False).output
 
 
 def GetNormalizedCommandOutputAndLeakyTests(cmd):
@@ -200,7 +151,7 @@
 
   # Disables exception pop-ups on Windows.
   os.environ['GTEST_CATCH_EXCEPTIONS'] = '1'
-  return GetNormalizedOutputAndLeakyTests(GetShellCommandOutput(cmd, ''))
+  return GetNormalizedOutputAndLeakyTests(GetShellCommandOutput(cmd))
 
 
 class GMockOutputTest(unittest.TestCase):
diff --git a/test/gmock_test_utils.py b/test/gmock_test_utils.py
index 2fda138..ae15a10 100755
--- a/test/gmock_test_utils.py
+++ b/test/gmock_test_utils.py
@@ -35,7 +35,19 @@
 
 import os
 import sys
-import unittest
+
+# Determines path to gtest_test_utils and imports it.
+SCRIPT_DIR = os.path.dirname(__file__) or '.'
+
+# isdir resolves symbolic links.
+gtest_tests_util_dir = os.path.join(SCRIPT_DIR, '../gtest/test')
+if os.path.isdir(gtest_tests_util_dir):
+  GTEST_TESTS_UTIL_DIR = gtest_tests_util_dir
+else:
+  GTEST_TESTS_UTIL_DIR = os.path.join(SCRIPT_DIR, '../../gtest/test')
+
+sys.path.append(GTEST_TESTS_UTIL_DIR)
+import gtest_test_utils  # pylint: disable-msg=C6204
 
 
 # Initially maps a flag to its default value.  After
@@ -96,6 +108,22 @@
   return os.path.abspath(GetFlag('gmock_build_dir'))
 
 
+def GetTestExecutablePath(executable_name):
+  """Returns the absolute path of the test binary given its name.
+
+  The function will print a message and abort the program if the resulting file
+  doesn't exist.
+
+  Args:
+    executable_name: name of the test binary that the test script runs.
+
+  Returns:
+    The absolute path of the test binary.
+  """
+
+  return gtest_test_utils.GetTestExecutablePath(executable_name, GetBuildDir())
+
+
 def GetExitStatus(exit_code):
   """Returns the argument to exit(), or -1 if exit() wasn't called.
 
@@ -116,11 +144,15 @@
       return -1
 
 
+# Exposes Subprocess from gtest_test_utils.
+Subprocess = gtest_test_utils.Subprocess  # pylint: disable-msg=C6409
+
+
 def Main():
   """Runs the unit test."""
 
   # We must call _ParseAndStripGMockFlags() before calling
-  # unittest.main().  Otherwise the latter will be confused by the
-  # --gmock_* flags.
+  # gtest_test_utils.Main().  Otherwise unittest.main it calls will be
+  # confused by the --gmock_* flags.
   _ParseAndStripGMockFlags(sys.argv)
-  unittest.main()
+  gtest_test_utils.Main()