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/usr/lib/python2.7/dist-packages/setuptest/setuptest.py is in python-django-setuptest 0.2.1-2.

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import argparse
import django
import pep8
import sys
import time
import traceback
import unittest

from coverage import coverage, misc
from distutils import log
from django.utils.six import StringIO


class LabelException(Exception):
    pass


class SetupTestSuite(unittest.TestSuite):
    """
    Test Suite configuring Django settings and using
    DiscoverRunner or DjangoTestSuiteRunner as the test runner.
    Also runs PEP8 and Coverage checks.
    """
    def __init__(self, *args, **kwargs):
        self.cov = coverage()
        self.cov.start()
        self.configure()
        self.packages = self.resolve_packages()

        parser = argparse.ArgumentParser()
        parser.add_argument('-a', '--autoreload', dest='autoreload',
                action='store_const', const=True, default=False,)
        parser.add_argument('-f', '--failfast', dest='failfast',
                action='store_const', const=True, default=False,)
        parser.add_argument('-l', '--label', dest='label')
        self.options = vars(parser.parse_args(sys.argv[2:]))
        sys.argv = sys.argv[:2]

        runner_options = {
            'verbosity': 1,
            'interactive': True,
            'failfast': False,
        }

        if django.VERSION >= (1, 8):
            from django.test.runner import DiscoverRunner
            self.test_runner = DiscoverRunner(**runner_options)
            tests = self.test_runner.build_suite()
        else:
            from django.test.simple import DjangoTestSuiteRunner
            self.test_runner = DjangoTestSuiteRunner(**runner_options)
            tests = self.build_tests()

        super(SetupTestSuite, self).__init__(tests=tests, *args, **kwargs)

        # South patches the test management command to handle the
        # SOUTH_TESTS_MIGRATE setting. Apply that patch if South is installed.
        if django.VERSION < (1,7):
            try:
                from south.management.commands import patch_for_test_db_setup
                patch_for_test_db_setup()
            except ImportError:
                pass
        self.test_runner.setup_test_environment()
        self.old_config = self.test_runner.setup_databases()

    def handle_label_exception(self, exception):
        """
        Check whether or not the exception was caused due to a bad label
        being provided. If so raise LabelException which will cause an exit,
        otherwise continue.

        The check looks for particular error messages, which obviously sucks.
        TODO: Implement a cleaner test.
        """
        markers = [
            'no such test method',
            'should be of the form app.TestCase or app.TestCase.test_method',
            'App with label',
            'does not refer to a test',
        ]
        if any(marker in exception.message for marker in markers):
            log.info(exception)
            raise LabelException(exception)
        else:
            raise exception

    def build_tests(self):
        """
        Build tests for inclusion in suite from resolved packages for <= 1.8
        TODO: Cleanup/simplify this method, flow too complex,
        too much duplication.
        """
        from django.core.exceptions import ImproperlyConfigured
        from django.test.simple import build_suite, build_test
        try:
            from django.apps import apps
            get_app = apps.get_app_config
        except ImportError:
            from django.db.models import get_app
        tests = []
        packages = [self.options['label'], ] if \
                self.options['label'] else self.packages
        for package in packages:
            try:
                if not self.options['autoreload']:
                    if self.options['label']:
                        try:
                            tests.append(build_test(package))
                        except (ImproperlyConfigured, ValueError) as e:
                            self.handle_label_exception(e)
                    else:
                        app = get_app(package)
                        tests.append(build_suite(app))
                else:
                    # Wait for exceptions to be resolved.
                    exception = None
                    while True:
                        try:
                            if self.options['label']:
                                try:
                                    tests.append(build_test(package))
                                except (ImproperlyConfigured, ValueError) as e:
                                    self.handle_label_exception(e)
                            else:
                                app = get_app(package)
                                tests.append(build_suite(app))
                            break
                        except LabelException:
                            raise
                        except Exception as e:
                            if exception != str(e):
                                traceback.print_exc()
                            exception = str(e)
                            time.sleep(1)
            except ImproperlyConfigured as e:
                log.info("Warning: %s" % traceback.format_exc())
            except ImportError as e:
                log.info("Warning: %s" % traceback.format_exc())

        return tests

    def configure(self):
        """
        Configures Django settings.
        """

        import django
        from django.conf import settings
        try:
            from django.utils.importlib import import_module
        except ImportError:
            from importlib import import_module
        try:
            test_settings = import_module('test_settings')
        except ImportError as e:
            log.info('ImportError: Unable to import test settings: %s' % e)
            sys.exit(1)

        setting_attrs = {}
        for attr in dir(test_settings):
            if '__' not in attr:
                setting_attrs[attr] = getattr(test_settings, attr)

        if not settings.configured:
            settings.configure(**setting_attrs)

        if hasattr(django, 'setup'):
            django.setup()

    def coverage_report(self):
        """
        Outputs Coverage report to screen and coverage.xml.
        """
        verbose = '--quiet' not in sys.argv
        self.cov.stop()
        if verbose:
            log.info("\nCoverage Report:")
            try:
                include = ['%s*' % package for package in self.packages]
                omit = ['*tests*']
                self.cov.report(include=include, omit=omit)
                self.cov.save()
                self.cov.xml_report(include=include, omit=omit)
            except misc.CoverageException as e:
                log.info("Coverage Exception: %s" % e)

    def resolve_packages(self):
        """
        Frame hack to determine packages contained in module for testing.
        We ignore submodules (those containing '.')
        """
        f = sys._getframe()
        while f:
            if 'self' in f.f_locals:
                locals_self = f.f_locals['self']
                py_modules = getattr(locals_self, 'py_modules', None)
                packages = getattr(locals_self, 'packages', None)

                top_packages = []
                if py_modules or packages:
                    if py_modules:
                        for module in py_modules:
                            if '.' not in module:
                                top_packages.append(module)
                    if packages:
                        for package in packages:
                            if '.' not in package:
                                top_packages.append(package)

                    return list(set(top_packages))
            f = f.f_back

    def pep8_report(self):
        """
        Outputs PEP8 report to screen and pep8.txt.
        """
        verbose = '--quiet' not in sys.argv
        if verbose:
            # Hook into stdout.
            old_stdout = sys.stdout
            sys.stdout = mystdout = StringIO()

            # Run Pep8 checks, excluding South migrations.
            pep8_style = pep8.StyleGuide()
            pep8_style.options.exclude.append('migrations')
            pep8_style.options.exclude.append('south_migrations')
            pep8_style.check_files(self.packages)

            # Restore stdout.
            sys.stdout = old_stdout

            # Save result to pep8.txt.
            result = mystdout.getvalue()
            output = open('pep8.txt', 'w')
            output.write(result)
            output.close()

            # Return Pep8 result
            if result:
                log.info("\nPEP8 Report:")
                log.info(result)

    def run(self, result, *args, **kwargs):
        """
        Run the test, teardown the environment and generate reports.
        """
        result.failfast = self.options['failfast']
        result = super(SetupTestSuite, self).run(result, *args, **kwargs)
        self.test_runner.teardown_databases(self.old_config)
        self.test_runner.teardown_test_environment()
        self.coverage_report()
        self.pep8_report()
        return result