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"""
TestCommon.py: a testing framework for commands and scripts
with commonly useful error handling
The TestCommon module provides a simple, high-level interface for writing
tests of executable commands and scripts, especially commands and scripts
that interact with the file system. All methods throw exceptions and
exit on failure, with useful error messages. This makes a number of
explicit checks unnecessary, making the test scripts themselves simpler
to write and easier to read.
The TestCommon class is a subclass of the TestCmd class. In essence,
TestCommon is a wrapper that handles common TestCmd error conditions in
useful ways. You can use TestCommon directly, or subclass it for your
program and add additional (or override) methods to tailor it to your
program's specific needs. Alternatively, the TestCommon class serves
as a useful example of how to define your own TestCmd subclass.
As a subclass of TestCmd, TestCommon provides access to all of the
variables and methods from the TestCmd module. Consequently, you can
use any variable or method documented in the TestCmd module without
having to explicitly import TestCmd.
A TestCommon environment object is created via the usual invocation:
import TestCommon
test = TestCommon.TestCommon()
You can use all of the TestCmd keyword arguments when instantiating a
TestCommon object; see the TestCmd documentation for details.
Here is an overview of the methods and keyword arguments that are
provided by the TestCommon class:
test.must_be_writable('file1', ['file2', ...])
test.must_contain('file', 'required text\n')
test.must_exist('file1', ['file2', ...])
test.must_match('file', "expected contents\n")
test.must_not_be_writable('file1', ['file2', ...])
test.must_not_exist('file1', ['file2', ...])
test.run(options = "options to be prepended to arguments",
stdout = "expected standard output from the program",
stderr = "expected error output from the program",
status = expected_status,
match = match_function)
The TestCommon module also provides the following variables
TestCommon.python_executable
TestCommon.exe_suffix
TestCommon.obj_suffix
TestCommon.shobj_suffix
TestCommon.lib_prefix
TestCommon.lib_suffix
TestCommon.dll_prefix
TestCommon.dll_suffix
"""
# Copyright 2000, 2001, 2002, 2003, 2004 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.
__author__ = "Steven Knight <knight at baldmt dot com>"
__revision__ = "TestCommon.py 0.14.D001 2005/08/15 23:02:35 knight"
__version__ = "0.14"
import os
import os.path
import stat
import string
import sys
import types
import UserList
from TestCmd import *
from TestCmd import __all__
__all__.extend([ 'TestCommon',
'exe_suffix',
'obj_suffix',
'shobj_suffix',
'lib_prefix',
'lib_suffix',
'dll_prefix',
'dll_suffix',
])
# Variables that describe the prefixes and suffixes on this system.
if sys.platform == 'win32':
exe_suffix = '.exe'
obj_suffix = '.obj'
shobj_suffix = '.obj'
lib_prefix = ''
lib_suffix = '.lib'
dll_prefix = ''
dll_suffix = '.dll'
elif sys.platform == 'cygwin':
exe_suffix = '.exe'
obj_suffix = '.o'
shobj_suffix = '.os'
lib_prefix = 'lib'
lib_suffix = '.a'
dll_prefix = ''
dll_suffix = '.dll'
elif string.find(sys.platform, 'irix') != -1:
exe_suffix = ''
obj_suffix = '.o'
shobj_suffix = '.o'
lib_prefix = 'lib'
lib_suffix = '.a'
dll_prefix = 'lib'
dll_suffix = '.so'
elif string.find(sys.platform, 'darwin') != -1:
exe_suffix = ''
obj_suffix = '.o'
shobj_suffix = '.os'
lib_prefix = 'lib'
lib_suffix = '.a'
dll_prefix = 'lib'
dll_suffix = '.dylib'
else:
exe_suffix = ''
obj_suffix = '.o'
shobj_suffix = '.os'
lib_prefix = 'lib'
lib_suffix = '.a'
dll_prefix = 'lib'
dll_suffix = '.so'
def is_List(e):
return type(e) is types.ListType \
or isinstance(e, UserList.UserList)
def is_writable(f):
mode = os.stat(f)[stat.ST_MODE]
return mode & stat.S_IWUSR
def separate_files(flist):
existing = []
missing = []
for f in flist:
if os.path.exists(f):
existing.append(f)
else:
missing.append(f)
return existing, missing
class TestFailed(Exception):
def __init__(self, args=None):
self.args = args
class TestNoResult(Exception):
def __init__(self, args=None):
self.args = args
if os.name == 'posix':
def _failed(self, status = 0):
if self.status is None or status is None:
return None
if os.WIFSIGNALED(self.status):
return None
return _status(self) != status
def _status(self):
if os.WIFEXITED(self.status):
return os.WEXITSTATUS(self.status)
else:
return None
elif os.name == 'nt':
def _failed(self, status = 0):
return not (self.status is None or status is None) and \
self.status != status
def _status(self):
return self.status
class TestCommon(TestCmd):
# Additional methods from the Perl Test::Cmd::Common module
# that we may wish to add in the future:
#
# $test->subdir('subdir', ...);
#
# $test->copy('src_file', 'dst_file');
#
# $test->chmod($mode, 'file', ...);
#
# $test->touch('file', ...);
def __init__(self, **kw):
"""Initialize a new TestCommon instance. This involves just
calling the base class initialization, and then changing directory
to the workdir.
"""
apply(TestCmd.__init__, [self], kw)
os.chdir(self.workdir)
def must_be_writable(self, *files):
"""Ensures that the specified file(s) exist and are writable.
An individual file can be specified as a list of directory names,
in which case the pathname will be constructed by concatenating
them. Exits FAILED if any of the files does not exist or is
not writable.
"""
files = map(lambda x: is_List(x) and apply(os.path.join, x) or x, files)
existing, missing = separate_files(files)
unwritable = filter(lambda x, iw=is_writable: not iw(x), existing)
if missing:
print "Missing files: `%s'" % string.join(missing, "', `")
if unwritable:
print "Unwritable files: `%s'" % string.join(unwritable, "', `")
self.fail_test(missing + unwritable)
def must_contain(self, file, required, mode = 'rb'):
"""Ensures that the specified file contains the required text.
"""
file_contents = self.read(file, mode)
contains = (string.find(file_contents, required) != -1)
if not contains:
print "File `%s' does not contain required string." % file
print "Required string ====="
print required
print "%s contents =====" % file
print file_contents
self.fail_test(not contains)
def must_exist(self, *files):
"""Ensures that the specified file(s) must exist. An individual
file be specified as a list of directory names, in which case the
pathname will be constructed by concatenating them. Exits FAILED
if any of the files does not exist.
"""
files = map(lambda x: is_List(x) and apply(os.path.join, x) or x, files)
missing = filter(lambda x: not os.path.exists(x), files)
if missing:
print "Missing files: `%s'" % string.join(missing, "', `")
self.fail_test(missing)
def must_match(self, file, expect, mode = 'rb'):
"""Matches the contents of the specified file (first argument)
against the expected contents (second argument). The expected
contents are a list of lines or a string which will be split
on newlines.
"""
file_contents = self.read(file, mode)
try:
self.fail_test(not self.match(file_contents, expect))
except KeyboardInterrupt:
raise
except:
print "Unexpected contents of `%s'" % file
print "EXPECTED contents ======"
print expect
print "ACTUAL contents ========"
print file_contents
raise
def must_not_exist(self, *files):
"""Ensures that the specified file(s) must not exist.
An individual file be specified as a list of directory names, in
which case the pathname will be constructed by concatenating them.
Exits FAILED if any of the files exists.
"""
files = map(lambda x: is_List(x) and apply(os.path.join, x) or x, files)
existing = filter(os.path.exists, files)
if existing:
print "Unexpected files exist: `%s'" % string.join(existing, "', `")
self.fail_test(existing)
def must_not_be_writable(self, *files):
"""Ensures that the specified file(s) exist and are not writable.
An individual file can be specified as a list of directory names,
in which case the pathname will be constructed by concatenating
them. Exits FAILED if any of the files does not exist or is
writable.
"""
files = map(lambda x: is_List(x) and apply(os.path.join, x) or x, files)
existing, missing = separate_files(files)
writable = filter(is_writable, existing)
if missing:
print "Missing files: `%s'" % string.join(missing, "', `")
if writable:
print "Writable files: `%s'" % string.join(writable, "', `")
self.fail_test(missing + writable)
def run(self, options = None, arguments = None,
stdout = None, stderr = '', status = 0, **kw):
"""Runs the program under test, checking that the test succeeded.
The arguments are the same as the base TestCmd.run() method,
with the addition of:
options Extra options that get appended to the beginning
of the arguments.
stdout The expected standard output from
the command. A value of None means
don't test standard output.
stderr The expected error output from
the command. A value of None means
don't test error output.
status The expected exit status from the
command. A value of None means don't
test exit status.
By default, this expects a successful exit (status = 0), does
not test standard output (stdout = None), and expects that error
output is empty (stderr = "").
"""
if options:
if arguments is None:
arguments = options
else:
arguments = options + " " + arguments
kw['arguments'] = arguments
try:
match = kw['match']
del kw['match']
except KeyError:
match = self.match
try:
apply(TestCmd.run, [self], kw)
except KeyboardInterrupt:
raise
except:
print "STDOUT ============"
print self.stdout()
print "STDERR ============"
print self.stderr()
raise
if _failed(self, status):
expect = ''
if status != 0:
expect = " (expected %s)" % str(status)
print "%s returned %s%s" % (self.program, str(_status(self)), expect)
print "STDOUT ============"
print self.stdout()
print "STDERR ============"
print self.stderr()
raise TestFailed
if not stdout is None and not match(self.stdout(), stdout):
print "Expected STDOUT =========="
print stdout
print "Actual STDOUT ============"
print self.stdout()
stderr = self.stderr()
if stderr:
print "STDERR ==================="
print stderr
raise TestFailed
if not stderr is None and not match(self.stderr(), stderr):
print "STDOUT ==================="
print self.stdout()
print "Expected STDERR =========="
print stderr
print "Actual STDERR ============"
print self.stderr()
raise TestFailed
|