Various minor improvements to recipe_simulation_test.py.

scripts/slave/unittests/expect_tests/main.py

 # Copyright 2014 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.
 
 import argparse
 import multiprocessing
 import sys
 
 from .cover import CoverageContext
 
@@ skipping 44 matching lines @@
           help='run N jobs in parallel (default %(default)s)')
 
     sp.add_argument(
         '--test_list', metavar='FILE',
         help='take the list of test globs from the FILE (use "-" for stdin)')
 
     sp.add_argument(
         'test_glob', nargs='*', help=(
             'glob to filter the tests acted on. If the glob begins with "-" '
             'then it acts as a negation glob and anything which matches it '
-            'will be skipped.'))
+            'will be skipped. If a glob doesn\'t have "*" in it, "*" will be '
+            'implicitly appended to the end'))
 
   opts = parser.parse_args(args)
 
   if not hasattr(opts, 'jobs'):
     opts.jobs = 0
   elif opts.jobs < 1:
     parser.error('--jobs was less than 1')
 
   if opts.test_list:
     fh = sys.stdin if opts.test_list == '-' else open(opts.test_list, 'rb')
@@ skipping 42 matching lines @@
                                 opts)
 
     cover_ctx.cleanup()
     if not killed and not opts.test_glob:
       if not cover_ctx.report(opts.verbose):
         sys.exit(2)
 
     sys.exit(error or killed)
   except KeyboardInterrupt:
     pass