Add local pytest plugin for --with-xunit and --logging-level

The --with-xunit option ihas the same behavior as in nosetests:
it's an alias for pytest's --junitxml=nosetests.py

The --logging-level option enables direct IPA logging to stdout.

https://fedorahosted.org/freeipa/ticket/4610

Reviewed-By: Tomas Babej <tbabej@redhat.com>

ipatests/pytest.ini

@@ -7,6 +7,8 @@
 [pytest]
 python_classes = test_ Test
 addopts = --doctest-modules
+          --junit-prefix ipa
+          -p ipatests.pytest_plugins.nose_compat
           -p ipatests.pytest_plugins.declarative
           -p ipatests.pytest_plugins.ordering
             # Ignore files for doc tests.

ipatests/pytest_plugins/nose_compat.py

@@ -0,0 +1,73 @@
+# Authors:
+#   Petr Viktorin <pviktori@redhat.com>
+#
+# Copyright (C) 2014  Red Hat
+# see file 'COPYING' for use and warranty information
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Provides command-line options for very limited Nose compatibility"""
+
+import os
+import sys
+import logging
+
+from ipapython.ipa_log_manager import log_mgr
+
+
+def pytest_addoption(parser):
+    group = parser.getgroup("IPA nosetests compatibility shim")
+
+    group.addoption('--with-xunit', action="store_const",
+           dest="xmlpath", metavar="path",  default=None,
+           const=os.environ.get('IPATEST_XUNIT_PATH', './nosetests.xml'),
+           help="create junit-xml style report file at $IPATEST_XUNIT_PATH,"
+                "or nosetests.xml by default")
+
+    group.addoption('--logging-level', action="store",
+           dest="logging_level", metavar="level", default='CRITICAL',
+           help="level for logging to stderr. "
+                "Bypasses pytest logging redirection."
+                "May be used to show progress of long-running tests.")
+
+
+def pytest_configure(config):
+    if config.getoption('logging_level'):
+        # Forward IPA logging to a normal Python logger. Nose's logcapture plugin
+        # can't work with IPA-managed loggers
+        class LogHandler(logging.Handler):
+            name = 'forwarding log handler'
+            logger = logging.getLogger('IPA')
+
+            def emit(self, record):
+                capture = config.pluginmanager.getplugin('capturemanager')
+                orig_stdout, orig_stderr = sys.stdout, sys.stderr
+                if capture:
+                    capture._capturing.suspend_capturing()
+                sys.stderr.write(self.format(record))
+                sys.stderr.write('\n')
+                if capture:
+                    capture._capturing.resume_capturing()
+                sys.stdout, sys.stderr = orig_stdout, orig_stderr
+
+        log_mgr.configure(
+            {
+                'default_level': config.getoption('logging_level'),
+                'handlers': [{'log_handler': LogHandler(),
+                            'format': '[%(name)s] %(message)s',
+                            'level': 'debug'},
+                            {'level': 'debug',
+                            'name': 'real_stderr',
+                            'stream': sys.stderr}]},
+            configure_state='tests')