~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005 by Canonical Ltd

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Enhanced layer on unittest.

This does several things:

* nicer reporting as tests run

* test code can log messages into a buffer that is recorded to disk

  and displayed if the test fails

* tests can be run in a separate directory, which is useful for code that

  wants to create files

* utilities to run external commands and check their return code

  and/or output

Test cases should normally subclass TestBase.  The test runner should

call runsuite().

This is meant to become independent of bzr, though that's not quite

true yet.

"""  

from unittest import TestResult, TestCase

def _need_subprocess():

    sys.stderr.write("sorry, this test suite requires the subprocess module\n"

                     "this is shipped with python2.4 and available separately for 2.3\n")

class CommandFailed(Exception):

    pass

class TestSkipped(Exception):

    """Indicates that a test was intentionally skipped, rather than failing."""

    # XXX: Not used yet

class TestBase(TestCase):

    """Base class for bzr test cases.

    Just defines some useful helper functions; doesn't actually test

    anything.

    """

    # TODO: Special methods to invoke bzr, so that we can run it

    # through a specified Python intepreter

    OVERRIDE_PYTHON = None # to run with alternative python 'python'

    BZRPATH = 'bzr'

    _log_buf = ""

    def setUp(self):

        super(TestBase, self).setUp()

        self.log("%s setup" % self.id())

    def tearDown(self):

        super(TestBase, self).tearDown()

        self.log("%s teardown" % self.id())

        self.log('')

    def formcmd(self, cmd):

        if isinstance(cmd, basestring):

            cmd = cmd.split()

        if cmd[0] == 'bzr':

            cmd[0] = self.BZRPATH

            if self.OVERRIDE_PYTHON:

                cmd.insert(0, self.OVERRIDE_PYTHON)

        self.log('$ %r' % cmd)

        return cmd

    def runcmd(self, cmd, retcode=0):

        """Run one command and check the return code.

        Returns a tuple of (stdout,stderr) strings.

        If a single string is based, it is split into words.

        For commands that are not simple space-separated words, please

        pass a list instead."""

        try:

            import shutil

            from subprocess import call

        except ImportError, e:

            _need_subprocess()

            raise

        cmd = self.formcmd(cmd)

        self.log('$ ' + ' '.join(cmd))

        actual_retcode = call(cmd, stdout=self.TEST_LOG, stderr=self.TEST_LOG)

        if retcode != actual_retcode:

            raise CommandFailed("test failed: %r returned %d, expected %d"

                                % (cmd, actual_retcode, retcode))

    def backtick(self, cmd, retcode=0):

        """Run a command and return its output"""

        try:

            import shutil

            from subprocess import Popen, PIPE

        except ImportError, e:

            _need_subprocess()

            raise

        cmd = self.formcmd(cmd)

        child = Popen(cmd, stdout=PIPE, stderr=self.TEST_LOG)

        outd, errd = child.communicate()

        self.log(outd)

        actual_retcode = child.wait()

        outd = outd.replace('\r', '')

        if retcode != actual_retcode:

            raise CommandFailed("test failed: %r returned %d, expected %d"

                                % (cmd, actual_retcode, retcode))

        return outd

    def build_tree(self, shape):

        """Build a test tree according to a pattern.

        shape is a sequence of file specifications.  If the final

        character is '/', a directory is created.

        This doesn't add anything to a branch.

        """

        # XXX: It's OK to just create them using forward slashes on windows?

        import os

        for name in shape:

            assert isinstance(name, basestring)

            if name[-1] == '/':

                os.mkdir(name[:-1])

            else:

                f = file(name, 'wt')

                print >>f, "contents of", name

                f.close()

    def log(self, msg):

        """Log a message to a progress file"""

        self._log_buf = self._log_buf + str(msg) + '\n'

        print >>self.TEST_LOG, msg

    def check_inventory_shape(self, inv, shape):

        """

        Compare an inventory to a list of expected names.

        Fail if they are not precisely equal.

        """

        extras = []

        shape = list(shape)             # copy

        for path, ie in inv.entries():

            name = path.replace('\\', '/')

            if ie.kind == 'dir':

                name = name + '/'

            if name in shape:

                shape.remove(name)

            else:

                extras.append(name)

        if shape:

            self.fail("expected paths not found in inventory: %r" % shape)

        if extras:

            self.fail("unexpected paths found in inventory: %r" % extras)

    def check_file_contents(self, filename, expect):

        self.log("check contents of file %s" % filename)

        contents = file(filename, 'r').read()

        if contents != expect:

            self.log("expected: %r" % expected)

            self.log("actually: %r" % contents)

            self.fail("contents of %s not as expected")

class InTempDir(TestBase):

    """Base class for tests run in a temporary branch."""

    def setUp(self):

        import os

        self.test_dir = os.path.join(self.TEST_ROOT, self.__class__.__name__)

        os.mkdir(self.test_dir)

        os.chdir(self.test_dir)

    def tearDown(self):

        import os

        os.chdir(self.TEST_ROOT)

class _MyResult(TestResult):

    """

    Custom TestResult.

    No special behaviour for now.

    """

    def __init__(self, out):

        self.out = out

        TestResult.__init__(self)

    def startTest(self, test):

        # TODO: Maybe show test.shortDescription somewhere?

        what = test.id()

        # python2.3 has the bad habit of just "runit" for doctests

        if what == 'runit':

            what = test.shortDescription()

        print >>self.out, '%-60.60s' % what,

        self.out.flush()

        TestResult.startTest(self, test)

    def stopTest(self, test):

        # print

        TestResult.stopTest(self, test)

    def addError(self, test, err):

        print >>self.out, 'ERROR'

        TestResult.addError(self, test, err)

        _show_test_failure('error', test, err, self.out)

    def addFailure(self, test, err):

        print >>self.out, 'FAILURE'

        TestResult.addFailure(self, test, err)

        _show_test_failure('failure', test, err, self.out)

    def addSuccess(self, test):

        print >>self.out, 'OK'

        TestResult.addSuccess(self, test)

def run_suite(suite, name="test"):

    import os

    import shutil

    import time

    import sys

    _setup_test_log(name)

    _setup_test_dir(name)

    print

    # save stdout & stderr so there's no leakage from code-under-test

    real_stdout = sys.stdout

    real_stderr = sys.stderr

    sys.stdout = sys.stderr = TestBase.TEST_LOG

    try:

        result = _MyResult(real_stdout)

        suite.run(result)

    finally:

        sys.stdout = real_stdout

        sys.stderr = real_stderr

    _show_results(result)

    return result.wasSuccessful()

def _setup_test_log(name):

    import time

    import os

    log_filename = os.path.abspath(name + '.log')

    TestBase.TEST_LOG = open(log_filename, 'wt', buffering=1) # line buffered

    print >>TestBase.TEST_LOG, "tests run at " + time.ctime()

    print '%-30s %s' % ('test log', log_filename)

def _setup_test_dir(name):

    import os

    import shutil

    TestBase.ORIG_DIR = os.getcwdu()

    TestBase.TEST_ROOT = os.path.abspath(name + '.tmp')

    print '%-30s %s' % ('running tests in', TestBase.TEST_ROOT)

    if os.path.exists(TestBase.TEST_ROOT):

        shutil.rmtree(TestBase.TEST_ROOT)

    os.mkdir(TestBase.TEST_ROOT)

    os.chdir(TestBase.TEST_ROOT)

    # make a fake bzr directory there to prevent any tests propagating

    # up onto the source directory's real branch

    os.mkdir(os.path.join(TestBase.TEST_ROOT, '.bzr'))

def _show_results(result):

     print

     print '%4d tests run' % result.testsRun

     print '%4d errors' % len(result.errors)

     print '%4d failures' % len(result.failures)

def _show_test_failure(kind, case, exc_info, out):

    from traceback import print_exception

    print >>out, '-' * 60

    print >>out, case

    desc = case.shortDescription()

    if desc:

        print >>out, '   (%s)' % desc

    print_exception(exc_info[0], exc_info[1], exc_info[2], None, out)

    if isinstance(case, TestBase):

        print >>out

        print >>out, 'log from this test:'

        print >>out, case._log_buf

    print >>out, '-' * 60