Add a test to verify that the breakpad symbol-generating script actually exists.

Tools/Scripts/webkitpy/layout_tests/breakpad/dump_reader_multipart_unittest.py

 # Copyright (C) 2013 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
@@ skipping 12 matching lines @@
 # 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.
 
 import unittest
 
 import cgi
 
+from webkitpy.common.host import Host
 from webkitpy.common.host_mock import MockHost
 from webkitpy.common.system.executive_mock import MockExecutive
 from webkitpy.layout_tests.breakpad.dump_reader_multipart import DumpReaderMultipart
 
 
 class TestDumpReaderMultipart(unittest.TestCase):
     _MULTIPART_DUMP = [
         '--boundary',
         'Content-Disposition: form-data; name="prod"',
         '',
         'content_shell',
         '--boundary',
         'Content-Disposition: form-data; name="pid"',
         '',
         '4711',
         '--boundary',
         'Content-Disposition: form-data; name="upload_file_minidump"; filename="dump"',
         'Content-Type: application/octet-stream',
         '',
         'MDMP',
         '--boundary--',
     ]
 
+    def test_check_generate_breakpad_symbols_actually_exists(self):
+        host = Host()
+        dump_reader = DumpReaderMultipart(host, build_dir=None)
+        self.assertTrue(host.filesystem.exists(dump_reader._path_to_generate_breakpad_symbols()))
+
     def test_check_is_functional_breakpad_tools_not_found(self):
         host = MockHost()
 
         build_dir = "/mock-checkout/out/Debug"
         host.filesystem.maybe_make_directory(build_dir)
         dump_reader = DumpReaderMultipart(host, build_dir)
         dump_reader._file_extension = lambda: 'dmp'
         dump_reader._binaries_to_symbolize = lambda: ['content_shell']
 
         self.assertFalse(dump_reader.check_is_functional())
@@ skipping 34 matching lines @@
         dump_reader._file_extension = lambda: 'dmp'
         dump_reader._binaries_to_symbolize = lambda: ['content_shell']
 
         self.assertTrue(dump_reader.check_is_functional())
         self.assertEqual("MOCK output of child process", dump_reader._get_stack_from_dump(dump_file))
         self.assertEqual(2, len(host.executive.calls))
         cmd_line = " ".join(host.executive.calls[0])
         self.assertIn('generate_breakpad_symbols.py', cmd_line)
         cmd_line = " ".join(host.executive.calls[1])
         self.assertIn('minidump_stackwalk', cmd_line)