Lib/test/regrtest.py

#! /usr/bin/env python

"""Regression test.

This will find all modules whose name is "test_*" in the test
directory, and run them.  Various command line options provide
additional facilities.

Command line options:

-v: verbose   -- run tests in verbose mode with output to stdout
-q: quiet     -- don't print anything except if a test fails
-g: generate  -- write the output file for a test instead of comparing it
-x: exclude   -- arguments are tests to *exclude*
-s: single    -- run only a single test (see below)
-r: random    -- randomize test execution order
-f: fromfile  -- read names of tests to run from a file (see below)
-l: findleaks -- if GC is available detect tests that leak memory
-u: use       -- specify which special resource intensive tests to run
-h: help      -- print this text and exit
-t: threshold -- call gc.set_threshold(N)

If non-option arguments are present, they are names for tests to run,
unless -x is given, in which case they are names for tests not to run.
If no test names are given, all tests are run.

-v is incompatible with -g and does not compare test output files.

-s means to run only a single test and exit.  This is useful when
doing memory analysis on the Python interpreter (which tend to consume
too many resources to run the full regression test non-stop).  The
file /tmp/pynexttest is read to find the next test to run.  If this
file is missing, the first test_*.py file in testdir or on the command
line is used.  (actually tempfile.gettempdir() is used instead of
/tmp).

-f reads the names of tests from the file given as f's argument, one
or more test names per line.  Whitespace is ignored.  Blank lines and
lines beginning with '#' are ignored.  This is especially useful for
whittling down failures involving interactions among tests.

-u is used to specify which special resource intensive tests to run,
such as those requiring large file support or network connectivity.
The argument is a comma-separated list of words indicating the
resources to test.  Currently only the following are defined:

    all -       Enable all special resources.

    curses -    Tests that use curses and will modify the terminal's
                state and output modes.

    largefile - It is okay to run some test that may create huge
                files.  These tests can take a long time and may
                consume >2GB of disk space temporarily.

    network -   It is okay to run tests that use external network
                resource, e.g. testing SSL support for sockets.
"""

import sys
import os
import getopt
import traceback
import random
import StringIO
import warnings
from sets import Set

# I see no other way to suppress these warnings;
# putting them in test_grammar.py has no effect:
warnings.filterwarnings("ignore", "hex/oct constants", FutureWarning,
                        ".*test.test_grammar$")

from test import test_support

RESOURCE_NAMES = ('curses', 'largefile', 'network')


def usage(code, msg=''):
    print __doc__
    if msg: print msg
    sys.exit(code)


def main(tests=None, testdir=None, verbose=0, quiet=0, generate=0,
         exclude=0, single=0, randomize=0, fromfile=None, findleaks=0,
         use_resources=None):
    """Execute a test suite.

    This also parses command-line options and modifies its behavior
    accordingly.

    tests -- a list of strings containing test names (optional)
    testdir -- the directory in which to look for tests (optional)

    Users other than the Python test suite will certainly want to
    specify testdir; if it's omitted, the directory containing the
    Python test suite is searched for.

    If the tests argument is omitted, the tests listed on the
    command-line will be used.  If that's empty, too, then all *.py
    files beginning with test_ will be used.

    The other default arguments (verbose, quiet, generate, exclude,
    single, randomize, findleaks, and use_resources) allow programmers
    calling main() directly to set the values that would normally be
    set by flags on the command line.

    """

    test_support.record_original_stdout(sys.stdout)
    try:
        opts, args = getopt.getopt(sys.argv[1:], 'hvgqxsrf:lu:t:',
                                   ['help', 'verbose', 'quiet', 'generate',
                                    'exclude', 'single', 'random', 'fromfile',
                                    'findleaks', 'use=', 'threshold='])
    except getopt.error, msg:
        usage(2, msg)

    # Defaults
    if use_resources is None:
        use_resources = []
    for o, a in opts:
        if o in ('-h', '--help'):
            usage(0)
        elif o in ('-v', '--verbose'):
            verbose += 1
        elif o in ('-q', '--quiet'):
            quiet = 1;
            verbose = 0
        elif o in ('-g', '--generate'):
            generate = 1
        elif o in ('-x', '--exclude'):
            exclude = 1
        elif o in ('-s', '--single'):
            single = 1
        elif o in ('-r', '--randomize'):
            randomize = 1
        elif o in ('-f', '--fromfile'):
            fromfile = a
        elif o in ('-l', '--findleaks'):
            findleaks = 1
        elif o in ('-t', '--threshold'):
            import gc
            gc.set_threshold(int(a))
        elif o in ('-u', '--use'):
            u = [x.lower() for x in a.split(',')]
            for r in u:
                if r == 'all':
                    use_resources = RESOURCE_NAMES
                    break
                if r not in RESOURCE_NAMES:
                    usage(1, 'Invalid -u/--use option: ' + a)
                if r not in use_resources:
                    use_resources.append(r)
    if generate and verbose:
        usage(2, "-g and -v don't go together!")
    if single and fromfile:
        usage(2, "-s and -f don't go together!")

    good = []
    bad = []
    skipped = []

    if findleaks:
        try:
            import gc
        except ImportError:
            print 'No GC available, disabling findleaks.'
            findleaks = 0
        else:
            # Uncomment the line below to report garbage that is not
            # freeable by reference counting alone.  By default only
            # garbage that is not collectable by the GC is reported.
            #gc.set_debug(gc.DEBUG_SAVEALL)
            found_garbage = []

    if single:
        from tempfile import gettempdir
        filename = os.path.join(gettempdir(), 'pynexttest')
        try:
            fp = open(filename, 'r')
            next = fp.read().strip()
            tests = [next]
            fp.close()
        except IOError:
            pass

    if fromfile:
        tests = []
        fp = open(fromfile)
        for line in fp:
            guts = line.split() # assuming no test has whitespace in its name
            if guts and not guts[0].startswith('#'):
                tests.extend(guts)
        fp.close()

    # Strip .py extensions.
    if args:
        args = map(removepy, args)
    if tests:
        tests = map(removepy, tests)

    stdtests = STDTESTS[:]
    nottests = NOTTESTS[:]
    if exclude:
        for arg in args:
            if arg in stdtests:
                stdtests.remove(arg)
        nottests[:0] = args
        args = []
    tests = tests or args or findtests(testdir, stdtests, nottests)
    if single:
        tests = tests[:1]
    if randomize:
        random.shuffle(tests)
    test_support.verbose = verbose      # Tell tests to be moderately quiet
    test_support.use_resources = use_resources
    save_modules = sys.modules.keys()
    for test in tests:
        if not quiet:
            print test
            sys.stdout.flush()
        ok = runtest(test, generate, verbose, quiet, testdir)
        if ok > 0:
            good.append(test)
        elif ok == 0:
            bad.append(test)
        else:
            skipped.append(test)
        if findleaks:
            gc.collect()
            if gc.garbage:
                print "Warning: test created", len(gc.garbage),
                print "uncollectable object(s)."
                # move the uncollectable objects somewhere so we don't see
                # them again
                found_garbage.extend(gc.garbage)
                del gc.garbage[:]
        # Unload the newly imported modules (best effort finalization)
        for module in sys.modules.keys():
            if module not in save_modules and module.startswith("test."):
                test_support.unload(module)

    # The lists won't be sorted if running with -r
    good.sort()
    bad.sort()
    skipped.sort()

    if good and not quiet:
        if not bad and not skipped and len(good) > 1:
            print "All",
        print count(len(good), "test"), "OK."
        if verbose:
            print "CAUTION:  stdout isn't compared in verbose mode:"
            print "a test that passes in verbose mode may fail without it."
    if bad:
        print count(len(bad), "test"), "failed:"
        printlist(bad)
    if skipped and not quiet:
        print count(len(skipped), "test"), "skipped:"
        printlist(skipped)

        e = _ExpectedSkips()
        plat = sys.platform
        if e.isvalid():
            surprise = Set(skipped) - e.getexpected()
            if surprise:
                print count(len(surprise), "skip"), \
                      "unexpected on", plat + ":"
                printlist(surprise)
            else:
                print "Those skips are all expected on", plat + "."
        else:
            print "Ask someone to teach regrtest.py about which tests are"
            print "expected to get skipped on", plat + "."

    if single:
        alltests = findtests(testdir, stdtests, nottests)
        for i in range(len(alltests)):
            if tests[0] == alltests[i]:
                if i == len(alltests) - 1:
                    os.unlink(filename)
                else:
                    fp = open(filename, 'w')
                    fp.write(alltests[i+1] + '\n')
                    fp.close()
                break
        else:
            os.unlink(filename)

    sys.exit(len(bad) > 0)


STDTESTS = [
    'test_grammar',
    'test_opcodes',
    'test_operations',
    'test_builtin',
    'test_exceptions',
    'test_types',
   ]

NOTTESTS = [
    'test_support',
    'test_b1',
    'test_b2',
    'test_future1',
    'test_future2',
    'test_future3',
    ]

def findtests(testdir=None, stdtests=STDTESTS, nottests=NOTTESTS):
    """Return a list of all applicable test modules."""
    if not testdir: testdir = findtestdir()
    names = os.listdir(testdir)
    tests = []
    for name in names:
        if name[:5] == "test_" and name[-3:] == os.extsep+"py":
            modname = name[:-3]
            if modname not in stdtests and modname not in nottests:
                tests.append(modname)
    tests.sort()
    return stdtests + tests

def runtest(test, generate, verbose, quiet, testdir = None):
    """Run a single test.
    test -- the name of the test
    generate -- if true, generate output, instead of running the test
    and comparing it to a previously created output file
    verbose -- if true, print more messages
    quiet -- if true, don't print 'skipped' messages (probably redundant)
    testdir -- test directory
    """
    test_support.unload(test)
    if not testdir: testdir = findtestdir()
    outputdir = os.path.join(testdir, "output")
    outputfile = os.path.join(outputdir, test)
    if verbose:
        cfp = None
    else:
        cfp = StringIO.StringIO()
    try:
        save_stdout = sys.stdout
        try:
            if cfp:
                sys.stdout = cfp
                print test              # Output file starts with test name
            if test.startswith('test.'):
                abstest = test
            else:
                # Always import it from the test package
                abstest = 'test.' + test
            the_package = __import__(abstest, globals(), locals(), [])
            the_module = getattr(the_package, test)
            # Most tests run to completion simply as a side-effect of
            # being imported.  For the benefit of tests that can't run
            # that way (like test_threaded_import), explicitly invoke
            # their test_main() function (if it exists).
            indirect_test = getattr(the_module, "test_main", None)
            if indirect_test is not None:
                indirect_test()
        finally:
            sys.stdout = save_stdout
    except (ImportError, test_support.TestSkipped), msg:
        if not quiet:
            print "test", test, "skipped --", msg
            sys.stdout.flush()
        return -1
    except KeyboardInterrupt:
        raise
    except test_support.TestFailed, msg:
        print "test", test, "failed --", msg
        sys.stdout.flush()
        return 0
    except:
        type, value = sys.exc_info()[:2]
        print "test", test, "crashed --", str(type) + ":", value
        sys.stdout.flush()
        if verbose:
            traceback.print_exc(file=sys.stdout)
            sys.stdout.flush()
        return 0
    else:
        if not cfp:
            return 1
        output = cfp.getvalue()
        if generate:
            if output == test + "\n":
                if os.path.exists(outputfile):
                    # Write it since it already exists (and the contents
                    # may have changed), but let the user know it isn't
                    # needed:
                    print "output file", outputfile, \
                          "is no longer needed; consider removing it"
                else:
                    # We don't need it, so don't create it.
                    return 1
            fp = open(outputfile, "w")
            fp.write(output)
            fp.close()
            return 1
        if os.path.exists(outputfile):
            fp = open(outputfile, "r")
            expected = fp.read()
            fp.close()
        else:
            expected = test + "\n"
        if output == expected:
            return 1
        print "test", test, "produced unexpected output:"
        sys.stdout.flush()
        reportdiff(expected, output)
        sys.stdout.flush()
        return 0

def reportdiff(expected, output):
    import difflib
    print "*" * 70
    a = expected.splitlines(1)
    b = output.splitlines(1)
    sm = difflib.SequenceMatcher(a=a, b=b)
    tuples = sm.get_opcodes()

    def pair(x0, x1):
        # x0:x1 are 0-based slice indices; convert to 1-based line indices.
        x0 += 1
        if x0 >= x1:
            return "line " + str(x0)
        else:
            return "lines %d-%d" % (x0, x1)

    for op, a0, a1, b0, b1 in tuples:
        if op == 'equal':
            pass

        elif op == 'delete':
            print "***", pair(a0, a1), "of expected output missing:"
            for line in a[a0:a1]:
                print "-", line,

        elif op == 'replace':
            print "*** mismatch between", pair(a0, a1), "of expected", \
                  "output and", pair(b0, b1), "of actual output:"
            for line in difflib.ndiff(a[a0:a1], b[b0:b1]):
                print line,

        elif op == 'insert':
            print "***", pair(b0, b1), "of actual output doesn't appear", \
                  "in expected output after line", str(a1)+":"
            for line in b[b0:b1]:
                print "+", line,

        else:
            print "get_opcodes() returned bad tuple?!?!", (op, a0, a1, b0, b1)

    print "*" * 70

def findtestdir():
    if __name__ == '__main__':
        file = sys.argv[0]
    else:
        file = __file__
    testdir = os.path.dirname(file) or os.curdir
    return testdir

def removepy(name):
    if name.endswith(os.extsep + "py"):
        name = name[:-3]
    return name

def count(n, word):
    if n == 1:
        return "%d %s" % (n, word)
    else:
        return "%d %ss" % (n, word)

def printlist(x, width=70, indent=4):
    """Print the elements of iterable x to stdout.

    Optional arg width (default 70) is the maximum line length.
    Optional arg indent (default 4) is the number of blanks with which to
    begin each line.
    """

    from textwrap import fill
    blanks = ' ' * indent
    print fill(' '.join(map(str, x)), width,
               initial_indent=blanks, subsequent_indent=blanks)

# Map sys.platform to a string containing the basenames of tests
# expected to be skipped on that platform.

_expectations = {
    'win32':
        """
        test_al
        test_cd
        test_cl
        test_commands
        test_crypt
        test_curses
        test_dbm
        test_dl
        test_email_codecs
        test_fcntl
        test_fork1
        test_gdbm
        test_gl
        test_grp
        test_imgfile
        test_largefile
        test_linuxaudiodev
        test_mhlib
        test_mpz
        test_nis
        test_openpty
        test_poll
        test_pty
        test_pwd
        test_resource
        test_signal
        test_socket_ssl
        test_socketserver
        test_sunaudiodev
        test_timing
        """,
    'linux2':
        """
        test_al
        test_cd
        test_cl
        test_curses
        test_dl
        test_email_codecs
        test_gl
        test_imgfile
        test_largefile
        test_nis
        test_ntpath
        test_socket_ssl
        test_socketserver
        test_sunaudiodev
        test_unicode_file
        test_winreg
        test_winsound
        """,
   'mac':
        """
        test_al
        test_bsddb
        test_cd
        test_cl
        test_commands
        test_crypt
        test_curses
        test_dbm
        test_dl
        test_fcntl
        test_fork1
        test_gl
        test_grp
        test_imgfile
        test_largefile
        test_linuxaudiodev
        test_locale
        test_mmap
        test_nis
        test_ntpath
        test_openpty
        test_poll
        test_popen2
        test_pty
        test_pwd
        test_signal
        test_socket_ssl
        test_socketserver
        test_sunaudiodev
        test_sundry
        test_timing
        test_unicode_file
        test_winreg
        test_winsound
        """,
    'unixware5':
        """
        test_al
        test_bsddb
        test_cd
        test_cl
        test_dl
        test_gl
        test_imgfile
        test_largefile
        test_linuxaudiodev
        test_minidom
        test_nis
        test_ntpath
        test_openpty
        test_pyexpat
        test_sax
        test_socketserver
        test_sunaudiodev
        test_sundry
        test_unicode_file
        test_winreg
        test_winsound
        """,
    'riscos':
        """
        test_al
        test_asynchat
        test_bsddb
        test_cd
        test_cl
        test_commands
        test_crypt
        test_dbm
        test_dl
        test_fcntl
        test_fork1
        test_gdbm
        test_gl
        test_grp
        test_imgfile
        test_largefile
        test_linuxaudiodev
        test_locale
        test_mmap
        test_nis
        test_ntpath
        test_openpty
        test_poll
        test_popen2
        test_pty
        test_pwd
        test_socket_ssl
        test_socketserver
        test_strop
        test_sunaudiodev
        test_sundry
        test_thread
        test_threaded_import
        test_threadedtempfile
        test_threading
        test_timing
        test_unicode_file
        test_winreg
        test_winsound
        """,
    'darwin':
        """
        test_al
        test_cd
        test_cl
        test_curses
        test_dl
        test_gdbm
        test_gl
        test_imgfile
        test_largefile
        test_linuxaudiodev
        test_minidom
        test_nis
        test_ntpath
        test_poll
        test_socket_ssl
        test_socketserver
        test_sunaudiodev
        test_unicode_file
        test_winreg
        test_winsound
        """,
    'sunos5':
        """
        test_al
        test_bsddb
        test_cd
        test_cl
        test_curses
        test_dbm
        test_email_codecs
        test_gdbm
        test_gl
        test_gzip
        test_imgfile
        test_linuxaudiodev
        test_mpz
        test_openpty
        test_socket_ssl
        test_socketserver
        test_winreg
        test_winsound
        test_zipfile
        test_zlib
        """,
    'hp-ux11':
        """
        test_al
        test_bsddb
        test_cd
        test_cl
        test_curses
        test_dl
        test_gdbm
        test_gl
        test_gzip
        test_imgfile
        test_largefile
        test_linuxaudiodev
        test_locale
        test_minidom
        test_nis
        test_ntpath
        test_openpty
        test_pyexpat
        test_sax
        test_socket_ssl
        test_socketserver
        test_sunaudiodev
        test_unicode_file
        test_winreg
        test_winsound
        test_zipfile
        test_zlib
        """,
    'atheos':
        """
        test_al
        test_cd
        test_cl
        test_curses
        test_dl
        test_email_codecs
        test_gdbm
        test_gl
        test_imgfile
        test_largefile
        test_linuxaudiodev
        test_locale
        test_mhlib
        test_mmap
        test_mpz
        test_nis
        test_poll
        test_popen2
        test_resource
        test_socket_ssl
        test_socketserver
        test_sunaudiodev
        test_unicode_file
        test_winreg
        test_winsound
        """,
}

class _ExpectedSkips:
    def __init__(self):
        self.valid = False
        if sys.platform in _expectations:
            s = _expectations[sys.platform]
            self.expected = Set(s.split())
            self.valid = True

    def isvalid(self):
        "Return true iff _ExpectedSkips knows about the current platform."
        return self.valid

    def getexpected(self):
        """Return set of test names we expect to skip on current platform.

        self.isvalid() must be true.
        """

        assert self.isvalid()
        return self.expected

if __name__ == '__main__':
    # Remove regrtest.py's own directory from the module search path.  This
    # prevents relative imports from working, and relative imports will screw
    # up the testing framework.  E.g. if both test.test_support and
    # test_support are imported, they will not contain the same globals, and
    # much of the testing framework relies on the globals in the
    # test.test_support module.
    mydir = os.path.abspath(os.path.normpath(os.path.dirname(sys.argv[0])))
    i = pathlen = len(sys.path)
    while i >= 0:
        i -= 1
        if os.path.abspath(os.path.normpath(sys.path[i])) == mydir:
            del sys.path[i]
    if len(sys.path) == pathlen:
        print 'Could not find %r in sys.path to remove it' % mydir
    main()