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# Copyright (c) 2017 Google Inc. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""
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_contain_all_lines(output, lines, ['title', find])
test.must_contain_any_line(output, lines, ['title', find])
test.must_exist('file1', ['file2', ...])
test.must_match('file', "expected contents\n")
test.must_not_be_writable('file1', ['file2', ...])
test.must_not_contain('file', 'banned text\n')
test.must_not_contain_any_line(output, lines, ['title', find])
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_prefix
TestCommon.shobj_suffix
TestCommon.lib_prefix
TestCommon.lib_suffix
TestCommon.dll_prefix
TestCommon.dll_suffix
"""
# Copyright 2000-2010 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.
from __future__ import print_function
__author__ = "Steven Knight <knight at baldmt dot com>"
__revision__ = "TestCommon.py 0.37.D001 2010/01/11 16:55:50 knight"
__version__ = "0.37"
import copy
import os
import os.path
import stat
import sys
try:
from UserList import UserList
except ImportError:
from collections import UserList
from TestCmd import *
from TestCmd import __all__
__all__.extend([ 'TestCommon',
'exe_suffix',
'obj_suffix',
'shobj_prefix',
'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'
shobj_prefix = ''
lib_prefix = ''
lib_suffix = '.lib'
dll_prefix = ''
dll_suffix = '.dll'
module_prefix = ''
module_suffix = '.dll'
elif sys.platform == 'cygwin':
exe_suffix = '.exe'
obj_suffix = '.o'
shobj_suffix = '.os'
shobj_prefix = ''
lib_prefix = 'lib'
lib_suffix = '.a'
dll_prefix = ''
dll_suffix = '.dll'
module_prefix = ''
module_suffix = '.dll'
elif sys.platform.find('irix') != -1:
exe_suffix = ''
obj_suffix = '.o'
shobj_suffix = '.o'
shobj_prefix = ''
lib_prefix = 'lib'
lib_suffix = '.a'
dll_prefix = 'lib'
dll_suffix = '.so'
module_prefix = 'lib'
module_prefix = '.so'
elif sys.platform.find('darwin') != -1:
exe_suffix = ''
obj_suffix = '.o'
shobj_suffix = '.os'
shobj_prefix = ''
lib_prefix = 'lib'
lib_suffix = '.a'
dll_prefix = 'lib'
dll_suffix = '.dylib'
module_prefix = ''
module_suffix = '.so'
elif sys.platform.find('sunos') != -1:
exe_suffix = ''
obj_suffix = '.o'
shobj_suffix = '.os'
shobj_prefix = 'so_'
lib_prefix = 'lib'
lib_suffix = '.a'
dll_prefix = 'lib'
dll_suffix = '.dylib'
module_prefix = ''
module_suffix = '.so'
else:
exe_suffix = ''
obj_suffix = '.o'
shobj_suffix = '.os'
shobj_prefix = ''
lib_prefix = 'lib'
lib_suffix = '.a'
dll_prefix = 'lib'
dll_suffix = '.so'
module_prefix = 'lib'
module_suffix = '.so'
def is_List(e):
return type(e) is list \
or isinstance(e, 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
def _failed(self, status = 0):
if self.status is None or status is None:
return None
try:
return _status(self) not in status
except TypeError:
# status wasn't an iterable
return _status(self) != 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');
def __init__(self, **kw):
"""Initialize a new TestCommon instance. This involves just
calling the base class initialization, and then changing directory
to the workdir.
"""
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: os.path.join(*x) if is_List(x) else x), files)
existing, missing = separate_files(files)
unwritable = [x for x in existing if not is_writable(x)]
if missing:
print("Missing files: `%s'" % "', `".join(missing))
if unwritable:
print("Unwritable files: `%s'" % "', `".join(unwritable))
self.fail_test(missing + unwritable)
def must_contain(self, file, required, mode = 'r'):
"""Ensures that the specified file contains the required text.
"""
file_contents = self.read(file, mode)
contains = (file_contents.find(required) != -1)
if not contains:
print("File `%s' does not contain required string." % file)
print(self.banner('Required string '))
print(required)
print(self.banner('%s contents ' % file))
print(file_contents)
self.fail_test(not contains)
def must_contain_all_lines(self, output, lines, title=None, find=None):
"""Ensures that the specified output string (first argument)
contains all of the specified lines (second argument).
An optional third argument can be used to describe the type
of output being searched, and only shows up in failure output.
An optional fourth argument can be used to supply a different
function, of the form "find(line, output), to use when searching
for lines in the output.
"""
if find is None:
find = lambda o, l: o.find(l) != -1
missing = []
for line in lines:
if not find(output, line):
missing.append(line)
if missing:
if title is None:
title = 'output'
sys.stdout.write("Missing expected lines from %s:\n" % title)
for line in missing:
sys.stdout.write(' ' + repr(line) + '\n')
sys.stdout.write(self.banner(title + ' '))
sys.stdout.write(output)
self.fail_test()
def must_contain_any_line(self, output, lines, title=None, find=None):
"""Ensures that the specified output string (first argument)
contains at least one of the specified lines (second argument).
An optional third argument can be used to describe the type
of output being searched, and only shows up in failure output.
An optional fourth argument can be used to supply a different
function, of the form "find(line, output), to use when searching
for lines in the output.
"""
if find is None:
find = lambda o, l: o.find(l) != -1
for line in lines:
if find(output, line):
return
if title is None:
title = 'output'
sys.stdout.write("Missing any expected line from %s:\n" % title)
for line in lines:
sys.stdout.write(' ' + repr(line) + '\n')
sys.stdout.write(self.banner(title + ' '))
sys.stdout.write(output)
self.fail_test()
def must_contain_lines(self, lines, output, title=None):
# Deprecated; retain for backwards compatibility.
return self.must_contain_all_lines(output, lines, title)
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: os.path.join(*x) if is_List(x) else x), files)
missing = [f for f in files if not os.path.exists(f)]
if missing:
print("Missing files: `%s'" % "', `".join(missing))
self.fail_test(missing)
def must_match(self, file, expect, mode = 'r'):
"""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)
self.diff(expect, file_contents, 'contents ')
raise
def must_not_contain(self, file, banned, mode = 'r'):
"""Ensures that the specified file doesn't contain the banned text.
"""
file_contents = self.read(file, mode)
contains = (file_contents.find(banned) != -1)
if contains:
print("File `%s' contains banned string." % file)
print(self.banner('Banned string '))
print(banned)
print(self.banner('%s contents ' % file))
print(file_contents)
self.fail_test(contains)
def must_not_contain_any_line(self, output, lines, title=None, find=None):
"""Ensures that the specified output string (first argument)
does not contain any of the specified lines (second argument).
An optional third argument can be used to describe the type
of output being searched, and only shows up in failure output.
An optional fourth argument can be used to supply a different
function, of the form "find(line, output), to use when searching
for lines in the output.
"""
if find is None:
find = lambda o, l: o.find(l) != -1
unexpected = []
for line in lines:
if find(output, line):
unexpected.append(line)
if unexpected:
if title is None:
title = 'output'
sys.stdout.write("Unexpected lines in %s:\n" % title)
for line in unexpected:
sys.stdout.write(' ' + repr(line) + '\n')
sys.stdout.write(self.banner(title + ' '))
sys.stdout.write(output)
self.fail_test()
def must_not_contain_lines(self, lines, output, title=None):
return self.must_not_contain_any_line(output, lines, title)
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: os.path.join(*x) if is_List(x) else x), files)
existing = [f for f in files if os.path.exists(f)]
if existing:
print("Unexpected files exist: `%s'" % "', `".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: os.path.join(*x) if is_List(x) else x), files)
existing, missing = separate_files(files)
writable = [x for x in existing if is_writable(x)]
if missing:
print("Missing files: `%s'" % "', `".join(missing))
if writable:
print("Writable files: `%s'" % "', `".join(writable))
self.fail_test(missing + writable)
def _complete(self, actual_stdout, expected_stdout,
actual_stderr, expected_stderr, status, match):
"""
Post-processes running a subcommand, checking for failure
status and displaying output appropriately.
"""
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(self.banner('STDOUT '))
print(actual_stdout)
print(self.banner('STDERR '))
print(actual_stderr)
self.fail_test()
if not expected_stdout is None and not match(actual_stdout,
expected_stdout):
self.diff(expected_stdout, actual_stdout, 'STDOUT ')
if actual_stderr:
print(self.banner('STDERR '))
print(actual_stderr)
self.fail_test()
if not expected_stderr is None and not match(actual_stderr,
expected_stderr):
print(self.banner('STDOUT '))
print(actual_stdout)
self.diff(expected_stderr, actual_stderr, 'STDERR ')
self.fail_test()
def start(self, program = None,
interpreter = None,
arguments = None,
universal_newlines = None,
**kw):
"""
Starts a program or script for the test environment.
This handles the "options" keyword argument and exceptions.
"""
options = kw.pop('options', None)
if options:
if arguments is None:
arguments = options
else:
arguments = options + " " + arguments
try:
return TestCmd.start(self, program, interpreter, arguments,
universal_newlines, **kw)
except KeyboardInterrupt:
raise
except Exception as e:
print(self.banner('STDOUT '))
try:
print(self.stdout())
except IndexError:
pass
print(self.banner('STDERR '))
try:
print(self.stderr())
except IndexError:
pass
cmd_args = self.command_args(program, interpreter, arguments)
sys.stderr.write('Exception trying to execute: %s\n' % cmd_args)
raise e
def finish(self, popen, stdout = None, stderr = '', status = 0, **kw):
"""
Finishes and waits for the process being run under control of
the specified popen argument. Additional arguments are similar
to those of the run() method:
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.
"""
TestCmd.finish(self, popen, **kw)
match = kw.get('match', self.match)
self._complete(self.stdout(), stdout,
self.stderr(), stderr, status, match)
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
match = kw.pop('match', self.match)
TestCmd.run(self, **kw)
self._complete(self.stdout(), stdout,
self.stderr(), stderr, status, match)
def skip_test(self, message="Skipping test.\n"):
"""Skips a test.
Proper test-skipping behavior is dependent on the external
TESTCOMMON_PASS_SKIPS environment variable. If set, we treat
the skip as a PASS (exit 0), and otherwise treat it as NO RESULT.
In either case, we print the specified message as an indication
that the substance of the test was skipped.
(This was originally added to support development under Aegis.
Technically, skipping a test is a NO RESULT, but Aegis would
treat that as a test failure and prevent the change from going to
the next step. Since we ddn't want to force anyone using Aegis
to have to install absolutely every tool used by the tests, we
would actually report to Aegis that a skipped test has PASSED
so that the workflow isn't held up.)
"""
if message:
sys.stdout.write(message)
sys.stdout.flush()
pass_skips = os.environ.get('TESTCOMMON_PASS_SKIPS')
if pass_skips in [None, 0, '0']:
# skip=1 means skip this function when showing where this
# result came from. They only care about the line where the
# script called test.skip_test(), not the line number where
# we call test.no_result().
self.no_result(skip=1)
else:
# We're under the development directory for this change,
# so this is an Aegis invocation; pass the test (exit 0).
self.pass_test()
# Local Variables:
# tab-width:4
# indent-tabs-mode:nil
# End:
# vim: set expandtab tabstop=4 shiftwidth=4: