[Android] Converts host driven tests to common test_dispatcher

build/android/pylib/host_driven/python_test_caller.py

-# Copyright (c) 2012 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.
-
-"""Helper module for calling python-based tests."""
-
-
-import logging
-import sys
-import time
-import traceback
-
-from pylib.base import base_test_result
-from pylib.instrumentation import test_result
-
-
-class PythonExceptionTestResult(test_result.InstrumentationTestResult):
-  """Helper class for creating a test result from python exception."""
-
-  def __init__(self, test_name, start_date_ms, exc_info):
-    """Constructs an PythonExceptionTestResult object.
-
-    Args:
-      test_name: name of the test which raised an exception.
-      start_date_ms: the starting time for the test.
-      exc_info: exception info, ostensibly from sys.exc_info().
-    """
-    exc_type, exc_value, exc_traceback = exc_info
-    trace_info = ''.join(traceback.format_exception(exc_type, exc_value,
-                                                    exc_traceback))
-    log_msg = 'Exception:\n' + trace_info
-    duration_ms = (int(time.time()) * 1000) - start_date_ms
-
-    super(PythonExceptionTestResult, self).__init__(
-        'PythonWrapper#' + test_name,
-        base_test_result.ResultType.FAIL,
-        start_date_ms,
-        duration_ms,
-        log=str(exc_type) + ' ' + log_msg)
-
-
-def CallPythonTest(test, options):
-  """Invokes a test function and translates Python exceptions into test results.
-
-  This method invokes SetUp()/TearDown() on the test. It is intended to be
-  resilient to exceptions in SetUp(), the test itself, and TearDown(). Any
-  Python exception means the test is marked as failed, and the test result will
-  contain information about the exception.
-
-  If SetUp() raises an exception, the test is not run.
-
-  If TearDown() raises an exception, the test is treated as a failure. However,
-  if the test itself raised an exception beforehand, that stack trace will take
-  precedence whether or not TearDown() also raised an exception.
-
-  shard_index is not applicable in single-device scenarios, when test execution
-  is serial rather than parallel. Tests can use this to bring up servers with
-  unique port numbers, for example. See also python_test_sharder.
-
-  Args:
-    test: an object which is ostensibly a subclass of PythonTestBase.
-    options: Options to use for setting up tests.
-
-  Returns:
-    A TestRunResults object which contains any results produced by the test or,
-    in the case of a Python exception, the Python exception info.
-  """
-
-  start_date_ms = int(time.time()) * 1000
-  failed = False
-
-  try:
-    test.SetUp(options)
-  except Exception:
-    failed = True
-    logging.exception(
-        'Caught exception while trying to run SetUp() for test: ' +
-        test.qualified_name)
-    # Tests whose SetUp() method has failed are likely to fail, or at least
-    # yield invalid results.
-    exc_info = sys.exc_info()
-    results = base_test_result.TestRunResults()
-    results.AddResult(PythonExceptionTestResult(
-        test.qualified_name, start_date_ms, exc_info))
-    return results
-
-  try:
-    results = test.Run()
-  except Exception:
-    # Setting this lets TearDown() avoid stomping on our stack trace from Run()
-    # should TearDown() also raise an exception.
-    failed = True
-    logging.exception('Caught exception while trying to run test: ' +
-                      test.qualified_name)
-    exc_info = sys.exc_info()
-    results = base_test_result.TestRunResults()
-    results.AddResult(PythonExceptionTestResult(
-        test.qualified_name, start_date_ms, exc_info))
-
-  try:
-    test.TearDown()
-  except Exception:
-    logging.exception(
-        'Caught exception while trying run TearDown() for test: ' +
-        test.qualified_name)
-    if not failed:
-      # Don't stomp the error during the test if TearDown blows up. This is a
-      # trade-off: if the test fails, this will mask any problem with TearDown
-      # until the test is fixed.
-      exc_info = sys.exc_info()
-      results = base_test_result.TestRunResults()
-      results.AddResult(PythonExceptionTestResult(
-          test.qualified_name, start_date_ms, exc_info))
-
-  return results