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"""
Unit test library
"""
import os
import socket
import sys
import tempfile
import time
try:
import configparser
except ImportError:
import ConfigParser as configparser
from io import BytesIO, StringIO
__all__ = ['HOSTNAME', 'load_cfg', 'make_temp_filename', 'make_temp_file',
'make_temp_dir', 'CLI_main']
# Get machine short hostname
HOSTNAME = socket.gethostname().split('.', 1)[0]
class TBytesIO(BytesIO):
"""Standard stream of in memory bytes for testing purpose."""
def __init__(self, initial_bytes=None):
if initial_bytes and type(initial_bytes) is not bytes:
initial_bytes = initial_bytes.encode('ascii')
BytesIO.__init__(self, initial_bytes)
def write(self, b):
if type(b) is bytes:
BytesIO.write(self, b)
else:
BytesIO.write(self, b.encode('ascii'))
def isatty(self):
return False
def load_cfg(name):
"""Load test configuration file as a new ConfigParser"""
cfgparser = configparser.ConfigParser()
cfgparser.read([ \
os.path.expanduser('~/.clustershell/tests/%s' % name),
'/etc/clustershell/tests/%s' % name])
return cfgparser
#
# Temp files and directories
#
def make_temp_filename(suffix=''):
"""Return a temporary name for a file."""
if len(suffix) > 0 and suffix[0] != '-':
suffix = '-' + suffix
fd, name = tempfile.mkstemp(suffix, prefix='cs-test-')
os.close(fd) # don't leak open fd
return name
def make_temp_file(text, suffix='', dir=None):
"""Create a temporary file with the provided text."""
assert type(text) is bytes
tmp = tempfile.NamedTemporaryFile(prefix='cs-test-',
suffix=suffix, dir=dir)
tmp.write(text)
tmp.flush()
return tmp
def make_temp_dir(suffix=''):
"""Create a temporary directory."""
if len(suffix) > 0 and suffix[0] != '-':
suffix = '-' + suffix
return tempfile.mkdtemp(suffix, prefix='cs-test-')
#
# CLI tests
#
def CLI_main(test, main, args, stdin, expected_stdout, expected_rc=0,
expected_stderr=None):
"""Generic CLI main() direct calling function that allows code coverage
checks."""
rc = -1
saved_stdin = sys.stdin
saved_stdout = sys.stdout
saved_stderr = sys.stderr
# Capture standard streams
# Input: if defined, stdin may either be a buffer or a string (with an
# encoding).
if stdin is not None:
if type(stdin) is bytes: # also works for str in Python 2
sys.stdin = TBytesIO(stdin)
else:
# If stdin is a string in Python 3, use StringIO as sys.stdin
# should be read in text mode for some tests.
sys.stdin = StringIO(stdin)
# Output: ClusterShell sends bytes to sys_stdout()/sys_stderr() and when
# print() is used, TBytesIO does a conversion to ascii.
sys.stdout = out = TBytesIO()
sys.stderr = err = TBytesIO()
sys.argv = args
try:
main()
except SystemExit as exc:
rc = int(str(exc))
finally:
sys.stdout = saved_stdout
sys.stderr = saved_stderr
sys.stdin = saved_stdin
try:
if expected_stdout is not None:
# expected_stdout might be a compiled regexp or a string
try:
if not expected_stdout.search(out.getvalue()):
# search failed; use assertEqual() to display
# expected/output
test.assertEqual(out.getvalue(), expected_stdout.pattern)
except AttributeError:
# not a regexp
test.assertEqual(out.getvalue(), expected_stdout)
if expected_stderr is not None:
# expected_stderr might be a compiled regexp or a string
try:
if not expected_stderr.match(err.getvalue()):
# match failed; use assertEqual() to display expected/output
test.assertEqual(err.getvalue(), expected_stderr.pattern)
except AttributeError:
# check the end as stderr messages are often prefixed with
# argv[0]
test.assertTrue(err.getvalue().endswith(expected_stderr),
err.getvalue() + b' != ' + expected_stderr)
if expected_rc is not None:
test.assertEqual(rc, expected_rc,
"rc=%d err=%s" % (rc, err.getvalue()))
finally:
out.close()
err.close()
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