Add an end-to-end test for symbolize_trace on macOS.

catapult_build/run_with_typ.py

 #!/usr/bin/env python
 # 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.
 
 """A wrapper around typ (test your projects)."""
 
 import os
 import sys
 
 
-def Run(top_level_dir, path=None):
+def Run(top_level_dir, path=None, suffixes=None):
   """Runs a set of Python tests using typ.
 
   Args:
     top_level_dir: Directory to look for Python unit tests in.
     path: A list of extra paths to add to sys.path when running the tests.
 
   Returns:
     An exit code (0 for success, otherwise non-zero).
   """
+  if not suffixes:
+    suffixes = ['*_test.py', '*_unittest.py']
   typ_path = os.path.abspath(os.path.join(
       os.path.dirname(__file__), os.path.pardir, 'third_party', 'typ'))
   _AddToPathIfNeeded(typ_path)
   import typ
   return typ.main(
       top_level_dir=top_level_dir,
       path=(path or []),
-      coverage_source=[top_level_dir])
+      coverage_source=[top_level_dir],
+      suffixes=suffixes)
 
 
 def _AddToPathIfNeeded(path):
   if path not in sys.path:
     sys.path.insert(0, path)