testcmd.py

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"""
TestCmd.py:  a testing framework for commands and scripts.

The TestCmd module provides a framework for portable automated testing of
executable commands and scripts (in any language, not just Python), especially
commands and scripts that require file system interaction.

In addition to running tests and evaluating conditions, the TestCmd module
manages and cleans up one or more temporary workspace directories, and provides
methods for creating files and directories in those workspace directories from
in-line data, here-documents), allowing tests to be completely self-contained.

A TestCmd environment object is created via the usual invocation:

    test = TestCmd()

The TestCmd module provides pass_test(), fail_test(), and no_result() unbound
methods that report test results for use with the Aegis change management
system. These methods terminate the test immediately, reporting PASSED, FAILED
or NO RESULT respectively and exiting with status 0 (success), 1 or 2
respectively. This allows for a distinction between an actual failed test and a
test that could not be properly evaluated because of an external condition (such
as a full file system or incorrect permissions).
"""

# Copyright 2000 Steven Knight
# This module is free software, and you may redistribute it and/or modify
# it under the same terms as Python itself, so long as this copyright message
# and disclaimer are retained in their original form.
#
# IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
# SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF
# THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
# DAMAGE.
#
# THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE.  THE CODE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS,
# AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
# SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

# Copyright 2002-2003 Vladimir Prus.
# Copyright 2002-2003 Dave Abrahams.
# Copyright 2006 Rene Rivera.
# Distributed under the Boost Software License, Version 1.0.
#    (See accompanying file LICENSE_1_0.txt or copy at
#         http://www.boost.org/LICENSE_1_0.txt)


from string import join, split

__author__ = "Steven Knight <[e-mail]>"
__revision__ = "TestCmd.py 0.D002 2001/08/31 14:56:12 software"
__version__ = "0.02"

from types import *

import os
import os.path
import popen2
import re
import shutil
import stat
import sys
import tempfile
import traceback


tempfile.template = 'testcmd.'

_Cleanup = []

def _clean():
    global _Cleanup
    list = _Cleanup[:]
    _Cleanup = []
    list.reverse()
    for test in list:
        test.cleanup()

sys.exitfunc = _clean


def caller(tblist, skip):
    string = ""
    arr = []
    for file, line, name, text in tblist:
        if file[-10:] == "TestCmd.py":
                break
        arr = [(file, line, name, text)] + arr
    atfrom = "at"
    for file, line, name, text in arr[skip:]:
        if name == "?":
            name = ""
        else:
            name = " (" + name + ")"
        string = string + ("%s line %d of %s%s\n" % (atfrom, line, file, name))
        atfrom = "\tfrom"
    return string


def fail_test(self=None, condition=True, function=None, skip=0):
    """Cause the test to fail.

    By default, the fail_test() method reports that the test FAILED and exits
    with a status of 1. If a condition argument is supplied, the test fails only
    if the condition is true.
    """
    if not condition:
        return
    if not function is None:
        function()
    of = ""
    desc = ""
    sep = " "
    if not self is None:
        if self.program:
            of = " of " + join(self.program, " ")
            sep = "\n\t"
        if self.description:
            desc = " [" + self.description + "]"
            sep = "\n\t"

    at = caller(traceback.extract_stack(), skip)

    sys.stderr.write("FAILED test" + of + desc + sep + at + """
in directory: """ + os.getcwd() )
    sys.exit(1)


def no_result(self=None, condition=True, function=None, skip=0):
    """Causes a test to exit with no valid result.

    By default, the no_result() method reports NO RESULT for the test and exits
    with a status of 2. If a condition argument is supplied, the test fails only
    if the condition is true.
    """
    if not condition:
        return
    if not function is None:
        function()
    of = ""
    desc = ""
    sep = " "
    if not self is None:
        if self.program:
            of = " of " + self.program
            sep = "\n\t"
        if self.description:
            desc = " [" + self.description + "]"
            sep = "\n\t"

    at = caller(traceback.extract_stack(), skip)
    sys.stderr.write("NO RESULT for test" + of + desc + sep + at)
    sys.exit(2)


def pass_test(self=None, condition=True, function=None):
    """Causes a test to pass.

    By default, the pass_test() method reports PASSED for the test and exits
    with a status of 0. If a condition argument is supplied, the test passes
    only if the condition is true.
    """
    if not condition:
        return
    if not function is None:
        function()
    sys.stderr.write("PASSED\n")
    sys.exit(0)


def match_exact(lines=None, matches=None):
    """Returns whether the given lists or strings containing lines separated
    using newline characters contain exactly the same data.
    """
    if not type(lines) is ListType:
        lines = split(lines, "\n")
    if not type(matches) is ListType:
        matches = split(matches, "\n")
    if len(lines) != len(matches):
        return
    for i in range(len(lines)):
        if lines[i] != matches[i]:
            return
    return 1


def match_re(lines=None, res=None):
    """Given lists or strings contain lines separated using newline characters.
    This function matches those lines one by one, interpreting the lines in the
    res parameter as regular expressions.
    """
    if not type(lines) is ListType:
        lines = split(lines, "\n")
    if not type(res) is ListType:
        res = split(res, "\n")
    if len(lines) != len(res):
        return
    for i in range(len(lines)):
        if not re.compile("^" + res[i] + "$").search(lines[i]):
            return
    return 1


class TestCmd:
    """Class TestCmd.
    """

    def __init__(self, description=None, program=None, workdir=None,
        subdir=None, verbose=False, match=None, inpath=None):

        self._cwd = os.getcwd()
        self.description_set(description)
        if inpath:
            self.program = program
        else:
            self.program_set(program)
        self.verbose_set(verbose)
        if not match is None:
            self.match_func = match
        else:
            self.match_func = match_re
        self._dirlist = []
        self._preserve = {'pass_test': 0, 'fail_test': 0, 'no_result': 0}
        if os.environ.has_key('PRESERVE') and not os.environ['PRESERVE'] is '':
            self._preserve['pass_test'] = os.environ['PRESERVE']
            self._preserve['fail_test'] = os.environ['PRESERVE']
            self._preserve['no_result'] = os.environ['PRESERVE']
        else:
            try:
                self._preserve['pass_test'] = os.environ['PRESERVE_PASS']
            except KeyError:
                pass
            try:
                self._preserve['fail_test'] = os.environ['PRESERVE_FAIL']
            except KeyError:
                pass
            try:
                self._preserve['no_result'] = os.environ['PRESERVE_NO_RESULT']
            except KeyError:
                pass
        self._stdout = []
        self._stderr = []
        self.status = None
        self.condition = 'no_result'
        self.workdir_set(workdir)
        self.subdir(subdir)

    def __del__(self):
        self.cleanup()

    def __repr__(self):
        return "%x" % id(self)

    def cleanup(self, condition=None):
        """Removes any temporary working directories for the specified TestCmd
        environment. If the environment variable PRESERVE was set when the
        TestCmd environment was created, temporary working directories are not
        removed. If any of the environment variables PRESERVE_PASS,
        PRESERVE_FAIL or PRESERVE_NO_RESULT were set when the TestCmd
        environment was created, then temporary working directories are not
        removed if the test passed, failed or had no result, respectively.
        Temporary working directories are also preserved for conditions
        specified via the preserve method.

        Typically, this method is not called directly, but is used when the
        script exits to clean up temporary working directories as appropriate
        for the exit status.
        """
        if not self._dirlist:
            return
        if condition is None:
            condition = self.condition
        if self._preserve[condition]:
            for dir in self._dirlist:
                print "Preserved directory", dir
        else:
            list = self._dirlist[:]
            list.reverse()
            for dir in list:
                self.writable(dir, 1)
                shutil.rmtree(dir, ignore_errors = 1)

        self._dirlist = []
        self.workdir = None
        os.chdir(self._cwd)
        try:
            global _Cleanup
            _Cleanup.remove(self)
        except (AttributeError, ValueError):
            pass

    def description_set(self, description):
        """Set the description of the functionality being tested.
        """
        self.description = description

    def fail_test(self, condition=True, function=None, skip=0):
        """Cause the test to fail.
        """
        if not condition:
            return
        self.condition = 'fail_test'
        fail_test(self = self,
                  condition = condition,
                  function = function,
                  skip = skip)

    def match(self, lines, matches):
        """Compare actual and expected file contents.
        """
        return self.match_func(lines, matches)

    def match_exact(self, lines, matches):
        """Compare actual and expected file contents.
        """
        return match_exact(lines, matches)

    def match_re(self, lines, res):
        """Compare actual and expected file contents.
        """
        return match_re(lines, res)

    def no_result(self, condition=True, function=None, skip=0):
        """Report that the test could not be run.