#!/usr/bin/env python
#
# Copyright 2008, Google Inc. All rights reserved.
#
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# modification, are permitted provided that the following conditions are
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#
#     * Redistributions of source code must retain the above copyright
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

"""Runs specified tests for Google Test.

SYNOPSIS
       run_tests.py [OPTION]... [BUILD_DIR]... [TEST]...

DESCRIPTION
       Runs the specified tests (either binary or Python), and prints a
       summary of the results. BUILD_DIRS will be used to search for the
       binaries. If no TESTs are specified, all binary tests found in
       BUILD_DIRs and all Python tests found in the directory test/ (in the
       gtest root) are run.

       TEST is a name of either a binary or a Python test. A binary test is
       an executable file named *_test or *_unittest (with the .exe
       extension on Windows) A Python test is a script named *_test.py or
       *_unittest.py.

OPTIONS
       -c CONFIGURATIONS
              Specify build directories via build configurations.
              CONFIGURATIONS is either a comma-separated list of build
              configurations or 'all'. Each configuration is equivalent to
              adding 'scons/build/<configuration>/scons' to BUILD_DIRs.
              Specifying -c=all is equivalent to providing all directories
              listed in KNOWN BUILD DIRECTORIES section below.

       -a
             Equivalent to -c=all

       -b
             Equivalent to -c=all with the exception that the script will not
             fail if some of the KNOWN BUILD DIRECTORIES do not exists; the
             script will simply not run the tests there. 'b' stands for
             'built directories'.

RETURN VALUE
       Returns 0 if all tests are successful; otherwise returns 1.

EXAMPLES
       run_tests.py
              Runs all tests for the default build configuration.

       run_tests.py -a
              Runs all tests with binaries in KNOWN BUILD DIRECTORIES.

       run_tests.py -b
              Runs all tests in KNOWN BUILD DIRECTORIES that have been
              built.

       run_tests.py foo/
              Runs all tests in the foo/ directory and all Python tests in
              the directory test. The Python tests are instructed to look
              for binaries in foo/.

       run_tests.py bar_test.exe test/baz_test.exe foo/ bar/
              Runs foo/bar_test.exe, bar/bar_test.exe, foo/baz_test.exe, and
              bar/baz_test.exe.

       run_tests.py foo bar test/foo_test.py
              Runs test/foo_test.py twice instructing it to look for its
              test binaries in the directories foo and bar,
              correspondingly.

KNOWN BUILD DIRECTORIES
      run_tests.py knows about directories where the SCons build script
      deposits its products. These are the directories where run_tests.py
      will be looking for its binaries. Currently, gtest's SConstruct file
      defines them as follows (the default build directory is the first one
      listed in each group):
      On Windows:
              <gtest root>/scons/build/win-dbg/scons/
              <gtest root>/scons/build/win-opt/scons/
              <gtest root>/scons/build/win-dbg8/scons/
              <gtest root>/scons/build/win-opt8/scons/
      On Mac:
              <gtest root>/scons/build/mac-dbg/scons/
              <gtest root>/scons/build/mac-opt/scons/
      On other platforms:
              <gtest root>/scons/build/dbg/scons/
              <gtest root>/scons/build/opt/scons/

AUTHOR
       Written by Zhanyong Wan (wan@google.com)
       and Vlad Losev(vladl@google.com).

REQUIREMENTS
       This script requires Python 2.3 or higher.
"""

import optparse
import os
import re
import sets
import sys

try:
  # subrocess module is a preferable way to invoke subprocesses but it may
  # not be available on MacOS X 10.4.
  import subprocess
except ImportError:
  subprocess = None

IS_WINDOWS = os.name == 'nt'
IS_MAC = os.name == 'posix' and os.uname()[0] == 'Darwin'

# Definition of CONFIGS must match that of the build directory names in the
# SConstruct script. The first list item is the default build configuration.
if IS_WINDOWS:
  CONFIGS = ('win-dbg', 'win-dbg8', 'win-opt', 'win-opt8')
elif IS_MAC:
  CONFIGS = ('mac-dbg', 'mac-opt')
else:
  CONFIGS = ('dbg', 'opt')

if IS_WINDOWS:
  PYTHON_TEST_REGEX = re.compile(r'_(unit)?test\.py$', re.IGNORECASE)
  BINARY_TEST_REGEX = re.compile(r'_(unit)?test(\.exe)?$', re.IGNORECASE)
else:
  PYTHON_TEST_REGEX = re.compile(r'_(unit)?test\.py$')
  BINARY_TEST_REGEX = re.compile(r'_(unit)?test$')

GTEST_BUILD_DIR = 'GTEST_BUILD_DIR'

def ScriptDir():
  """Returns the directory containing this script file."""

  my_path = sys.argv[0]
  my_dir = os.path.dirname(my_path)
  if not my_dir or __name__ != '__main__':
    my_dir = '.'
  return my_dir


MY_DIR = ScriptDir()


def GetBuildDirForConfig(config):
  """Returns the build directory for a given configuration."""

  return 'scons/build/%s/scons' % config


class TestRunner(object):
  """Provides facilities for running Python and binary tests for Google Test."""

  def __init__(self, injected_os=os, injected_subprocess=subprocess):
    self.os = injected_os
    self.subprocess = injected_subprocess

  def Run(self, args):
    """Runs the executable with given args (args[0] is the executable name).

    Args:
      args: Command line arguments for the process.

    Returns:
      Process's exit code if it exits normally, or -signal if the process is
      killed by a signal.
    """

    if self.subprocess:
      return self.subprocess.Popen(args).wait()
    else:
      return self.os.spawnv(self.os.P_WAIT, args[0], args)

  def RunBinaryTest(self, test):
    """Runs the binary test script given its path relative to the gtest root.

    Args:
      test: Path to the test binary relative to the location of this script.

    Returns:
      Process's exit code if it exits normally, or -signal if the process is
      killed by a signal.
    """

    return self.Run([self.os.path.abspath(self.os.path.join(MY_DIR, test))])

  def RunPythonTest(self, test, build_dir):
    """Runs the Python test script with the specified build directory.

    Args:
      test: Name of the test's Python script.
      build_dir: Path to the directory where the test binary is to be found.

    Returns:
      Process's exit code if it exits normally, or -signal if the process is
      killed by a signal.
    """

    old_build_dir = self.os.environ.get(GTEST_BUILD_DIR)

    try:
      self.os.environ[GTEST_BUILD_DIR] = build_dir

      # If this script is run on a Windows machine that has no association
      # between the .py extension and a python interpreter, simply passing
      # the script name into subprocess.Popen/os.spawn will not work.
      script = self.os.path.join(MY_DIR, test)
      print 'Running %s . . .' % (script,)
      return self.Run([sys.executable, script])

    finally:
      if old_build_dir is None:
        del self.os.environ[GTEST_BUILD_DIR]
      else:
        self.os.environ[GTEST_BUILD_DIR] = old_build_dir

  def FindFilesByRegex(self, directory, regex):
    """Returns files in a directory whose names match a regular expression.

    Args:
      directory: Path to the directory to search for files.
      regex: Regular expression to filter file names.

    Returns:
      The list of the paths to the files in the directory.
    """

    return [self.os.path.join(directory, file_name)
            for file_name in self.os.listdir(directory)
            if re.search(regex, file_name)]

  # TODO(vladl@google.com): Implement parsing of scons/SConscript to run all
  # tests defined there when no tests are specified.
  # TODO(vladl@google.com): Update the docstring after the code is changed to
  # try to test all builds defined in scons/SConscript.
  def GetTestsToRun(self,
                    args,
                    named_configurations,
                    built_configurations,
                    available_configurations=CONFIGS):
    """Determines what tests should be run.

    Args:
      args: The list of non-option arguments from the command line.
      named_configurations: The list of configurations specified via -c or -a.
      built_configurations: True if -b has been specified.
      available_configurations: a list of configurations available on the
                                current platform, injectable for testing.

    Returns:
      A tuple with 2 elements: the list of Python tests to run and the list of
      binary tests to run.
    """

    if named_configurations == 'all':
      named_configurations = ','.join(available_configurations)

    # A final list of build directories which will be searched for the test
    # binaries. First, add directories specified directly on the command
    # line.
    build_dirs = [arg for arg in args if self.os.path.isdir(arg)]

    # Adds build directories specified via their build configurations using
    # the -c or -a options.
    if named_configurations:
      build_dirs += [GetBuildDirForConfig(config)
                     for config in named_configurations.split(',')]

    # Adds KNOWN BUILD DIRECTORIES if -b is specified.
    if built_configurations:
      build_dirs += [GetBuildDirForConfig(config)
                     for config in available_configurations
                     if self.os.path.isdir(GetBuildDirForConfig(config))]

    # If no directories were specified either via -a, -b, -c, or directly, use
    # the default configuration.
    elif not build_dirs:
      build_dirs = [GetBuildDirForConfig(config)
                    for config in available_configurations[0:1]]

    # Makes sure there are no duplications.
    build_dirs = sets.Set(build_dirs)

    errors_found = False
    listed_python_tests = []  # All Python tests listed on the command line.
    listed_binary_tests = []  # All binary tests listed on the command line.

    # Sifts through non-directory arguments fishing for any Python or binary
    # tests and detecting errors.
    for argument in sets.Set(args) - build_dirs:
      if re.search(PYTHON_TEST_REGEX, argument):
        python_path = self.os.path.join('test', self.os.path.basename(argument))
        if self.os.path.isfile(self.os.path.join(MY_DIR, python_path)):
          listed_python_tests.append(python_path)
        else:
          sys.stderr.write('Unable to find Python test %s' % argument)
          errors_found = True
      elif re.search(BINARY_TEST_REGEX, argument):
        # This script also accepts binary test names prefixed with test/ for
        # the convenience of typing them (can use path completions in the
        # shell).  Strips test/ prefix from the binary test names.
        listed_binary_tests.append(self.os.path.basename(argument))
      else:
        sys.stderr.write('%s is neither test nor build directory' % argument)
        errors_found = True

    if errors_found:
      return None

    user_has_listed_tests = listed_python_tests or listed_binary_tests

    if user_has_listed_tests:
      selected_python_tests = listed_python_tests
    else:
      selected_python_tests = self.FindFilesByRegex('test', PYTHON_TEST_REGEX)

    # TODO(vladl@google.com): skip unbuilt Python tests when -b is specified.
    python_test_pairs = []
    for directory in build_dirs:
      for test in selected_python_tests:
        python_test_pairs.append((directory, test))

    binary_test_pairs = []
    for directory in build_dirs:
      if user_has_listed_tests:
        binary_test_pairs.extend(
            [(directory, self.os.path.join(directory, test))
             for test in listed_binary_tests])
      else:
        tests = self.FindFilesByRegex(directory, BINARY_TEST_REGEX)
        binary_test_pairs.extend([(directory, test) for test in tests])

    return (python_test_pairs, binary_test_pairs)

  def RunTests(self, python_tests, binary_tests):
    """Runs Python and binary tests represented as pairs (work_dir, binary).

    Args:
      python_tests: List of Python tests to run in the form of tuples
                    (build directory, Python test script).
      binary_tests: List of binary tests to run in the form of tuples
                    (build directory, binary file).

    Returns:
      The exit code the program should pass into sys.exit().
    """

    if python_tests or binary_tests:
      results = []
      for directory, test in python_tests:
        results.append((directory,
                        test,
                        self.RunPythonTest(test, directory) == 0))
      for directory, test in binary_tests:
        results.append((directory,
                        self.os.path.basename(test),
                        self.RunBinaryTest(test) == 0))

      failed = [(directory, test)
                for (directory, test, success) in results
                if not success]
      print
      print '%d tests run.' % len(results)
      if failed:
        print 'The following %d tests failed:' % len(failed)
        for (directory, test) in failed:
          print '%s in %s' % (test, directory)
        return 1
      else:
        print 'All tests passed!'
    else:  # No tests defined
      print 'Nothing to test - no tests specified!'

    return 0


def _Main():
  """Runs all tests for Google Test."""

  parser = optparse.OptionParser()
  parser.add_option('-c',
                    action='store',
                    dest='configurations',
                    default=None,
                    help='Test in the specified build directories')
  parser.add_option('-a',
                    action='store_const',
                    dest='configurations',
                    default=None,
                    const='all',
                    help='Test in all default build directories')
  parser.add_option('-b',
                    action='store_const',
                    dest='built_configurations',
                    default=False,
                    const=True,
                    help=('Test in all default build directories, do not fail'
                          'if some of them do not exist'))
  (options, args) = parser.parse_args()

  test_runner = TestRunner()
  tests = test_runner.GetTestsToRun(args,
                                    options.configurations,
                                    options.built_configurations)
  if not tests:
    sys.exit(1)  # Incorrect parameters given, abort execution.

  sys.exit(test_runner.RunTests(tests[0], tests[1]))

if __name__ == '__main__':
  _Main()