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# Copyright 2016 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 tempfile
import unittest
#from .log import *
#from .parsed_trace_events import *
from log import *
from parsed_trace_events import *
class TraceTest(unittest.TestCase):
def __init__(self, *args):
"""
Infrastructure for running tests of the tracing system.
Does not actually run any tests. Look at subclasses for those.
"""
unittest.TestCase.__init__(self, *args)
self._file = None
def go(self, cb):
"""
Enables tracing, runs the provided callback, and if successful, returns a
TraceEvents object with the results.
"""
self._file = tempfile.NamedTemporaryFile()
trace_enable(open(self._file.name, 'a+'))
try:
cb()
finally:
trace_disable()
e = ParsedTraceEvents(trace_filename = self._file.name)
self._file.close()
self._file = None
return e
@property
def trace_filename(self):
return self._file.name
def tearDown(self):
if trace_is_enabled():
trace_disable()
if self._file:
self._file.close()
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