django1/django/test/runner.py

import collections
import logging
import os
import unittest
from importlib import import_module
from unittest import TestSuite, defaultTestLoader

from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.db import DEFAULT_DB_ALIAS, connections
from django.test import SimpleTestCase, TestCase
from django.test.utils import setup_test_environment, teardown_test_environment
from django.utils.datastructures import OrderedSet
from django.utils.six import StringIO


class DebugSQLTextTestResult(unittest.TextTestResult):
    def __init__(self, stream, descriptions, verbosity):
        self.logger = logging.getLogger('django.db.backends')
        self.logger.setLevel(logging.DEBUG)
        super(DebugSQLTextTestResult, self).__init__(stream, descriptions, verbosity)

    def startTest(self, test):
        self.debug_sql_stream = StringIO()
        self.handler = logging.StreamHandler(self.debug_sql_stream)
        self.logger.addHandler(self.handler)
        super(DebugSQLTextTestResult, self).startTest(test)

    def stopTest(self, test):
        super(DebugSQLTextTestResult, self).stopTest(test)
        self.logger.removeHandler(self.handler)
        if self.showAll:
            self.debug_sql_stream.seek(0)
            self.stream.write(self.debug_sql_stream.read())
            self.stream.writeln(self.separator2)

    def addError(self, test, err):
        super(DebugSQLTextTestResult, self).addError(test, err)
        self.debug_sql_stream.seek(0)
        self.errors[-1] = self.errors[-1] + (self.debug_sql_stream.read(),)

    def addFailure(self, test, err):
        super(DebugSQLTextTestResult, self).addFailure(test, err)
        self.debug_sql_stream.seek(0)
        self.failures[-1] = self.failures[-1] + (self.debug_sql_stream.read(),)

    def printErrorList(self, flavour, errors):
        for test, err, sql_debug in errors:
            self.stream.writeln(self.separator1)
            self.stream.writeln("%s: %s" % (flavour, self.getDescription(test)))
            self.stream.writeln(self.separator2)
            self.stream.writeln("%s" % err)
            self.stream.writeln(self.separator2)
            self.stream.writeln("%s" % sql_debug)


class DiscoverRunner(object):
    """
    A Django test runner that uses unittest2 test discovery.
    """

    test_suite = TestSuite
    test_runner = unittest.TextTestRunner
    test_loader = defaultTestLoader
    reorder_by = (TestCase, SimpleTestCase)

    def __init__(self, pattern=None, top_level=None, verbosity=1,
                 interactive=True, failfast=False, keepdb=False,
                 reverse=False, debug_sql=False, **kwargs):

        self.pattern = pattern
        self.top_level = top_level

        self.verbosity = verbosity
        self.interactive = interactive
        self.failfast = failfast
        self.keepdb = keepdb
        self.reverse = reverse
        self.debug_sql = debug_sql

    @classmethod
    def add_arguments(cls, parser):
        parser.add_argument('-t', '--top-level-directory',
            action='store', dest='top_level', default=None,
            help='Top level of project for unittest discovery.')
        parser.add_argument('-p', '--pattern', action='store', dest='pattern',
            default="test*.py",
            help='The test matching pattern. Defaults to test*.py.')
        parser.add_argument('-k', '--keepdb', action='store_true', dest='keepdb',
            default=False,
            help='Preserves the test DB between runs.')
        parser.add_argument('-r', '--reverse', action='store_true', dest='reverse',
            default=False,
            help='Reverses test cases order.')
        parser.add_argument('-d', '--debug-sql', action='store_true', dest='debug_sql',
            default=False,
            help='Prints logged SQL queries on failure.')

    def setup_test_environment(self, **kwargs):
        setup_test_environment()
        settings.DEBUG = False
        unittest.installHandler()

    def build_suite(self, test_labels=None, extra_tests=None, **kwargs):
        suite = self.test_suite()
        test_labels = test_labels or ['.']
        extra_tests = extra_tests or []

        discover_kwargs = {}
        if self.pattern is not None:
            discover_kwargs['pattern'] = self.pattern
        if self.top_level is not None:
            discover_kwargs['top_level_dir'] = self.top_level

        for label in test_labels:
            kwargs = discover_kwargs.copy()
            tests = None

            label_as_path = os.path.abspath(label)

            # if a module, or "module.ClassName[.method_name]", just run those
            if not os.path.exists(label_as_path):
                tests = self.test_loader.loadTestsFromName(label)
            elif os.path.isdir(label_as_path) and not self.top_level:
                # Try to be a bit smarter than unittest about finding the
                # default top-level for a given directory path, to avoid
                # breaking relative imports. (Unittest's default is to set
                # top-level equal to the path, which means relative imports
                # will result in "Attempted relative import in non-package.").

                # We'd be happy to skip this and require dotted module paths
                # (which don't cause this problem) instead of file paths (which
                # do), but in the case of a directory in the cwd, which would
                # be equally valid if considered as a top-level module or as a
                # directory path, unittest unfortunately prefers the latter.

                top_level = label_as_path
                while True:
                    init_py = os.path.join(top_level, '__init__.py')
                    if os.path.exists(init_py):
                        try_next = os.path.dirname(top_level)
                        if try_next == top_level:
                            # __init__.py all the way down? give up.
                            break
                        top_level = try_next
                        continue
                    break
                kwargs['top_level_dir'] = top_level

            if not (tests and tests.countTestCases()) and is_discoverable(label):
                # Try discovery if path is a package or directory
                tests = self.test_loader.discover(start_dir=label, **kwargs)

                # Make unittest forget the top-level dir it calculated from this
                # run, to support running tests from two different top-levels.
                self.test_loader._top_level_dir = None

            suite.addTests(tests)

        for test in extra_tests:
            suite.addTest(test)

        return reorder_suite(suite, self.reorder_by, self.reverse)

    def setup_databases(self, **kwargs):
        return setup_databases(
            self.verbosity, self.interactive, self.keepdb, self.debug_sql,
            **kwargs
        )

    def get_resultclass(self):
        return DebugSQLTextTestResult if self.debug_sql else None

    def run_suite(self, suite, **kwargs):
        resultclass = self.get_resultclass()
        return self.test_runner(
            verbosity=self.verbosity,
            failfast=self.failfast,
            resultclass=resultclass,
        ).run(suite)

    def teardown_databases(self, old_config, **kwargs):
        """
        Destroys all the non-mirror databases.
        """
        for connection, old_name, destroy in old_config:
            if destroy:
                connection.creation.destroy_test_db(old_name, self.verbosity, self.keepdb)

    def teardown_test_environment(self, **kwargs):
        unittest.removeHandler()
        teardown_test_environment()

    def suite_result(self, suite, result, **kwargs):
        return len(result.failures) + len(result.errors)

    def run_tests(self, test_labels, extra_tests=None, **kwargs):
        """
        Run the unit tests for all the test labels in the provided list.

        Test labels should be dotted Python paths to test modules, test
        classes, or test methods.

        A list of 'extra' tests may also be provided; these tests
        will be added to the test suite.

        Returns the number of tests that failed.
        """
        self.setup_test_environment()
        suite = self.build_suite(test_labels, extra_tests)
        old_config = self.setup_databases()
        result = self.run_suite(suite)
        self.teardown_databases(old_config)
        self.teardown_test_environment()
        return self.suite_result(suite, result)


def is_discoverable(label):
    """
    Check if a test label points to a python package or file directory.

    Relative labels like "." and ".." are seen as directories.
    """
    try:
        mod = import_module(label)
    except (ImportError, TypeError):
        pass
    else:
        return hasattr(mod, '__path__')

    return os.path.isdir(os.path.abspath(label))


def dependency_ordered(test_databases, dependencies):
    """
    Reorder test_databases into an order that honors the dependencies
    described in TEST[DEPENDENCIES].
    """
    ordered_test_databases = []
    resolved_databases = set()

    # Maps db signature to dependencies of all it's aliases
    dependencies_map = {}

    # sanity check - no DB can depend on its own alias
    for sig, (_, aliases) in test_databases:
        all_deps = set()
        for alias in aliases:
            all_deps.update(dependencies.get(alias, []))
        if not all_deps.isdisjoint(aliases):
            raise ImproperlyConfigured(
                "Circular dependency: databases %r depend on each other, "
                "but are aliases." % aliases)
        dependencies_map[sig] = all_deps

    while test_databases:
        changed = False
        deferred = []

        # Try to find a DB that has all it's dependencies met
        for signature, (db_name, aliases) in test_databases:
            if dependencies_map[signature].issubset(resolved_databases):
                resolved_databases.update(aliases)
                ordered_test_databases.append((signature, (db_name, aliases)))
                changed = True
            else:
                deferred.append((signature, (db_name, aliases)))

        if not changed:
            raise ImproperlyConfigured(
                "Circular dependency in TEST[DEPENDENCIES]")
        test_databases = deferred
    return ordered_test_databases


def reorder_suite(suite, classes, reverse=False):
    """
    Reorders a test suite by test type.

    `classes` is a sequence of types

    All tests of type classes[0] are placed first, then tests of type
    classes[1], etc. Tests with no match in classes are placed last.

    If `reverse` is True, tests within classes are sorted in opposite order,
    but test classes are not reversed.
    """
    class_count = len(classes)
    suite_class = type(suite)
    bins = [OrderedSet() for i in range(class_count + 1)]
    partition_suite(suite, classes, bins, reverse=reverse)
    reordered_suite = suite_class()
    for i in range(class_count + 1):
        reordered_suite.addTests(bins[i])
    return reordered_suite


def partition_suite(suite, classes, bins, reverse=False):
    """
    Partitions a test suite by test type. Also prevents duplicated tests.

    classes is a sequence of types
    bins is a sequence of TestSuites, one more than classes
    reverse changes the ordering of tests within bins

    Tests of type classes[i] are added to bins[i],
    tests with no match found in classes are place in bins[-1]
    """
    suite_class = type(suite)
    if reverse:
        suite = reversed(tuple(suite))
    for test in suite:
        if isinstance(test, suite_class):
            partition_suite(test, classes, bins, reverse=reverse)
        else:
            for i in range(len(classes)):
                if isinstance(test, classes[i]):
                    bins[i].add(test)
                    break
            else:
                bins[-1].add(test)


def get_unique_databases():
    """
    Figure out which databases actually need to be created.

    Deduplicate entries in DATABASES that correspond the same database or are
    configured as test mirrors.

    Returns an ordered mapping of signatures to (name, list of aliases)
    where all aliases share the same unerlying database.
    """
    test_databases = {}
    dependencies = {}
    default_sig = connections[DEFAULT_DB_ALIAS].creation.test_db_signature()

    for alias in connections:
        connection = connections[alias]
        test_settings = connection.settings_dict['TEST']

        if test_settings['MIRROR']:
            target = test_settings['MIRROR']
            signature = connections[target].creation.test_db_signature()

        else:
            signature = connection.creation.test_db_signature()

            if 'DEPENDENCIES' in test_settings:
                dependencies[alias] = test_settings['DEPENDENCIES']
            elif alias != DEFAULT_DB_ALIAS and signature != default_sig:
                dependencies[alias] = test_settings.get('DEPENDENCIES', [DEFAULT_DB_ALIAS])

        # Store a tuple with DB parameters that uniquely identify it.
        # If we have two aliases with the same values for that tuple,
        # we only need to create the test database once.
        item = test_databases.setdefault(
            signature, (connection.settings_dict['NAME'], set()))
        item[1].add(alias)

    test_databases = dependency_ordered(test_databases.items(), dependencies)
    test_databases = collections.OrderedDict(test_databases)
    return test_databases


def setup_databases(verbosity, interactive, keepdb=False, debug_sql=False, **kwargs):
    """
    Creates the test databases.
    """
    test_databases = get_unique_databases()

    old_names = []

    for signature, (db_name, aliases) in test_databases.items():
        first_alias = None
        for alias in aliases:
            connection = connections[alias]
            old_names.append((connection, db_name, first_alias is None))

            # Actually create the database for the first connection
            if first_alias is None:
                first_alias = alias
                connection.creation.create_test_db(
                    verbosity,
                    autoclobber=not interactive,
                    keepdb=keepdb,
                    serialize=connection.settings_dict.get("TEST", {}).get("SERIALIZE", True),
                )
            # Configure all other connections as mirrors of the first one
            else:
                connections[alias].creation.set_as_test_mirror(
                    connections[first_alias].settings_dict)

    if debug_sql:
        for alias in connections:
            connections[alias].force_debug_cursor = True

    return old_names