Merge pull request #3124 from nicoddemus/logging-3013

Changes in the logging plugin for 3.4

_pytest/logging.py

@@ -2,7 +2,6 @@ from __future__ import absolute_import, division, print_function
 
 import logging
 from contextlib import closing, contextmanager
-import sys
 import six
 
 import pytest
@@ -48,6 +47,9 @@ def pytest_addoption(parser):
         '--log-date-format',
         dest='log_date_format', default=DEFAULT_LOG_DATE_FORMAT,
         help='log date format as used by the logging module.')
+    parser.addini(
+        'log_cli', default=False, type='bool',
+        help='enable log display during test run (also known as "live logging").')
     add_option_ini(
         '--log-cli-level',
         dest='log_cli_level', default=None,
@@ -79,13 +81,14 @@ def pytest_addoption(parser):
 
 
 @contextmanager
-def catching_logs(handler, formatter=None, level=logging.NOTSET):
+def catching_logs(handler, formatter=None, level=None):
     """Context manager that prepares the whole logging machinery properly."""
     root_logger = logging.getLogger()
 
     if formatter is not None:
         handler.setFormatter(formatter)
-    handler.setLevel(level)
+    if level is not None:
+        handler.setLevel(level)
 
     # Adding the same handler twice would confuse logging system.
     # Just don't do that.
@@ -93,12 +96,14 @@ def catching_logs(handler, formatter=None, level=logging.NOTSET):
 
     if add_new_handler:
         root_logger.addHandler(handler)
-    orig_level = root_logger.level
+    if level is not None:
-    root_logger.setLevel(min(orig_level, level))
+        orig_level = root_logger.level
+        root_logger.setLevel(level)
     try:
         yield handler
     finally:
-        root_logger.setLevel(orig_level)
+        if level is not None:
+            root_logger.setLevel(orig_level)
         if add_new_handler:
             root_logger.removeHandler(handler)
 
@@ -123,17 +128,39 @@ class LogCaptureFixture(object):
     def __init__(self, item):
         """Creates a new funcarg."""
         self._item = item
+        self._initial_log_levels = {}  # type: Dict[str, int] # dict of log name -> log level
+
+    def _finalize(self):
+        """Finalizes the fixture.
+
+        This restores the log levels changed by :meth:`set_level`.
+        """
+        # restore log levels
+        for logger_name, level in self._initial_log_levels.items():
+            logger = logging.getLogger(logger_name)
+            logger.setLevel(level)
 
     @property
     def handler(self):
         return self._item.catch_log_handler
 
-    def get_handler(self, when):
+    def get_records(self, when):
         """
-        Get the handler for a specified state of the tests.
+        Get the logging records for one of the possible test phases.
-        Valid values for the when parameter are: 'setup', 'call' and 'teardown'.
+
+        :param str when:
+            Which test phase to obtain the records from. Valid values are: "setup", "call" and "teardown".
+
+        :rtype: List[logging.LogRecord]
+        :return: the list of captured records at the given stage
+
+        .. versionadded:: 3.4
         """
-        return self._item.catch_log_handlers.get(when)
+        handler = self._item.catch_log_handlers.get(when)
+        if handler:
+            return handler.records
+        else:
+            return []
 
     @property
     def text(self):
@@ -161,31 +188,31 @@ class LogCaptureFixture(object):
         self.handler.records = []
 
     def set_level(self, level, logger=None):
-        """Sets the level for capturing of logs.
+        """Sets the level for capturing of logs. The level will be restored to its previous value at the end of
+        the test.
 
-        By default, the level is set on the handler used to capture
+        :param int level: the logger to level.
-        logs. Specify a logger name to instead set the level of any
+        :param str logger: the logger to update the level. If not given, the root logger level is updated.
-        logger.
+
+        .. versionchanged:: 3.4
+            The levels of the loggers changed by this function will be restored to their initial values at the
+            end of the test.
         """
-        if logger is None:
+        logger_name = logger
-            logger = self.handler
+        logger = logging.getLogger(logger_name)
-        else:
+        # save the original log-level to restore it during teardown
-            logger = logging.getLogger(logger)
+        self._initial_log_levels.setdefault(logger_name, logger.level)
         logger.setLevel(level)
 
     @contextmanager
     def at_level(self, level, logger=None):
-        """Context manager that sets the level for capturing of logs.
+        """Context manager that sets the level for capturing of logs. After the end of the 'with' statement the
+        level is restored to its original value.
 
-        By default, the level is set on the handler used to capture
+        :param int level: the logger to level.
-        logs. Specify a logger name to instead set the level of any
+        :param str logger: the logger to update the level. If not given, the root logger level is updated.
-        logger.
         """
-        if logger is None:
+        logger = logging.getLogger(logger)
-            logger = self.handler
-        else:
-            logger = logging.getLogger(logger)
-
         orig_level = logger.level
         logger.setLevel(level)
         try:
@@ -204,7 +231,9 @@ def caplog(request):
     * caplog.records()       -> list of logging.LogRecord instances
     * caplog.record_tuples() -> list of (logger_name, level, message) tuples
     """
-    return LogCaptureFixture(request.node)
+    result = LogCaptureFixture(request.node)
+    yield result
+    result._finalize()
 
 
 def get_actual_log_level(config, *setting_names):
@@ -234,8 +263,12 @@ def get_actual_log_level(config, *setting_names):
 
 
 def pytest_configure(config):
-    config.pluginmanager.register(LoggingPlugin(config),
+    config.pluginmanager.register(LoggingPlugin(config), 'logging-plugin')
-                                  'logging-plugin')
+
+
+@contextmanager
+def _dummy_context_manager():
+    yield
 
 
 class LoggingPlugin(object):
@@ -248,52 +281,42 @@ class LoggingPlugin(object):
         The formatter can be safely shared across all handlers so
         create a single one for the entire test session here.
         """
-        self.log_cli_level = get_actual_log_level(
+        self._config = config
-            config, 'log_cli_level', 'log_level') or logging.WARNING
+
+        # enable verbose output automatically if live logging is enabled
+        if self._config.getini('log_cli') and not config.getoption('verbose'):
+            # sanity check: terminal reporter should not have been loaded at this point
+            assert self._config.pluginmanager.get_plugin('terminalreporter') is None
+            config.option.verbose = 1
 
         self.print_logs = get_option_ini(config, 'log_print')
-        self.formatter = logging.Formatter(
+        self.formatter = logging.Formatter(get_option_ini(config, 'log_format'),
-            get_option_ini(config, 'log_format'),
+                                           get_option_ini(config, 'log_date_format'))
-            get_option_ini(config, 'log_date_format'))
+        self.log_level = get_actual_log_level(config, 'log_level')
-
-        log_cli_handler = logging.StreamHandler(sys.stderr)
-        log_cli_format = get_option_ini(
-            config, 'log_cli_format', 'log_format')
-        log_cli_date_format = get_option_ini(
-            config, 'log_cli_date_format', 'log_date_format')
-        log_cli_formatter = logging.Formatter(
-            log_cli_format,
-            datefmt=log_cli_date_format)
-        self.log_cli_handler = log_cli_handler  # needed for a single unittest
-        self.live_logs = catching_logs(log_cli_handler,
-                                       formatter=log_cli_formatter,
-                                       level=self.log_cli_level)
 
         log_file = get_option_ini(config, 'log_file')
         if log_file:
-            self.log_file_level = get_actual_log_level(
+            self.log_file_level = get_actual_log_level(config, 'log_file_level')
-                config, 'log_file_level') or logging.WARNING
 
-            log_file_format = get_option_ini(
+            log_file_format = get_option_ini(config, 'log_file_format', 'log_format')
-                config, 'log_file_format', 'log_format')
+            log_file_date_format = get_option_ini(config, 'log_file_date_format', 'log_date_format')
-            log_file_date_format = get_option_ini(
+            # Each pytest runtests session will write to a clean logfile
-                config, 'log_file_date_format', 'log_date_format')
+            self.log_file_handler = logging.FileHandler(log_file, mode='w')
-            self.log_file_handler = logging.FileHandler(
+            log_file_formatter = logging.Formatter(log_file_format, datefmt=log_file_date_format)
-                log_file,
-                # Each pytest runtests session will write to a clean logfile
-                mode='w')
-            log_file_formatter = logging.Formatter(
-                log_file_format,
-                datefmt=log_file_date_format)
             self.log_file_handler.setFormatter(log_file_formatter)
         else:
             self.log_file_handler = None
 
+        # initialized during pytest_runtestloop
+        self.log_cli_handler = None
+
     @contextmanager
     def _runtest_for(self, item, when):
         """Implements the internals of pytest_runtest_xxx() hook."""
         with catching_logs(LogCaptureHandler(),
-                           formatter=self.formatter) as log_handler:
+                           formatter=self.formatter, level=self.log_level) as log_handler:
+            if self.log_cli_handler:
+                self.log_cli_handler.set_when(when)
             if not hasattr(item, 'catch_log_handlers'):
                 item.catch_log_handlers = {}
             item.catch_log_handlers[when] = log_handler
@@ -325,10 +348,15 @@ class LoggingPlugin(object):
         with self._runtest_for(item, 'teardown'):
             yield
 
+    def pytest_runtest_logstart(self):
+        if self.log_cli_handler:
+            self.log_cli_handler.reset()
+
     @pytest.hookimpl(hookwrapper=True)
     def pytest_runtestloop(self, session):
         """Runs all collected test items."""
-        with self.live_logs:
+        self._setup_cli_logging()
+        with self.live_logs_context:
             if self.log_file_handler is not None:
                 with closing(self.log_file_handler):
                     with catching_logs(self.log_file_handler,
@@ -336,3 +364,65 @@ class LoggingPlugin(object):
                         yield  # run all the tests
             else:
                 yield  # run all the tests
+
+    def _setup_cli_logging(self):
+        """Sets up the handler and logger for the Live Logs feature, if enabled.
+
+        This must be done right before starting the loop so we can access the terminal reporter plugin.
+        """
+        terminal_reporter = self._config.pluginmanager.get_plugin('terminalreporter')
+        if self._config.getini('log_cli') and terminal_reporter is not None:
+            capture_manager = self._config.pluginmanager.get_plugin('capturemanager')
+            log_cli_handler = _LiveLoggingStreamHandler(terminal_reporter, capture_manager)
+            log_cli_format = get_option_ini(self._config, 'log_cli_format', 'log_format')
+            log_cli_date_format = get_option_ini(self._config, 'log_cli_date_format', 'log_date_format')
+            log_cli_formatter = logging.Formatter(log_cli_format, datefmt=log_cli_date_format)
+            log_cli_level = get_actual_log_level(self._config, 'log_cli_level', 'log_level')
+            self.log_cli_handler = log_cli_handler
+            self.live_logs_context = catching_logs(log_cli_handler, formatter=log_cli_formatter, level=log_cli_level)
+        else:
+            self.live_logs_context = _dummy_context_manager()
+
+
+class _LiveLoggingStreamHandler(logging.StreamHandler):
+    """
+    Custom StreamHandler used by the live logging feature: it will write a newline before the first log message
+    in each test.
+
+    During live logging we must also explicitly disable stdout/stderr capturing otherwise it will get captured
+    and won't appear in the terminal.
+    """
+
+    def __init__(self, terminal_reporter, capture_manager):
+        """
+        :param _pytest.terminal.TerminalReporter terminal_reporter:
+        :param _pytest.capture.CaptureManager capture_manager:
+        """
+        logging.StreamHandler.__init__(self, stream=terminal_reporter)
+        self.capture_manager = capture_manager
+        self.reset()
+        self.set_when(None)
+
+    def reset(self):
+        """Reset the handler; should be called before the start of each test"""
+        self._first_record_emitted = False
+
+    def set_when(self, when):
+        """Prepares for the given test phase (setup/call/teardown)"""
+        self._when = when
+        self._section_name_shown = False
+
+    def emit(self, record):
+        if self.capture_manager is not None:
+            self.capture_manager.suspend_global_capture()
+        try:
+            if not self._first_record_emitted or self._when == 'teardown':
+                self.stream.write('\n')
+                self._first_record_emitted = True
+            if not self._section_name_shown:
+                self.stream.section('live log ' + self._when, sep='-', bold=True)
+                self._section_name_shown = True
+            logging.StreamHandler.emit(self, record)
+        finally:
+            if self.capture_manager is not None:
+                self.capture_manager.resume_global_capture()

changelog/3013.feature

@@ -0,0 +1 @@
+**Incompatible change**: after community feedback the `logging <https://docs.pytest.org/en/latest/logging.html>`_ functionality has undergone some changes. Please consult the `logging documentation <https://docs.pytest.org/en/latest/logging.html#incompatible-changes-in-pytest-3-4>`_ for details.

changelog/3117.feature

@@ -1 +1 @@
-New ``caplog.get_handler(when)`` method which provides access to the underlying ``Handler`` class used to capture logging during each testing stage, allowing users to obtain the captured records during ``"setup"`` and ``"teardown"`` stages.
+New ``caplog.get_records(when)`` method which provides access the captured records during each testing stage: ``"setup"``, ``"call"`` and ``"teardown"`` stages.

doc/en/logging.rst

@@ -3,24 +3,11 @@
 Logging
 -------
 
-.. versionadded 3.3.0
+.. versionadded:: 3.3
+.. versionchanged:: 3.4
 
-.. note::
+pytest captures log messages of level ``WARNING`` or above automatically and displays them in their own section
-
+for each failed test in the same manner as captured stdout and stderr.
-   This feature is a drop-in replacement for the `pytest-catchlog
-   <https://pypi.org/project/pytest-catchlog/>`_ plugin and they will conflict
-   with each other. The backward compatibility API with ``pytest-capturelog``
-   has been dropped when this feature was introduced, so if for that reason you
-   still need ``pytest-catchlog`` you can disable the internal feature by
-   adding to your ``pytest.ini``:
-
-   .. code-block:: ini
-
-       [pytest]
-           addopts=-p no:logging
-
-Log messages are captured by default and for each failed test will be shown in
-the same manner as captured stdout and stderr.
 
 Running without options::
 
@@ -29,7 +16,7 @@ Running without options::
 Shows failed tests like so::
 
     ----------------------- Captured stdlog call ----------------------
-    test_reporting.py    26 INFO     text going to logger
+    test_reporting.py    26 WARNING  text going to logger
     ----------------------- Captured stdout call ----------------------
     text going to stdout
     ----------------------- Captured stderr call ----------------------
@@ -37,11 +24,10 @@ Shows failed tests like so::
     ==================== 2 failed in 0.02 seconds =====================
 
 By default each captured log message shows the module, line number, log level
-and message.  Showing the exact module and line number is useful for testing and
+and message.
-debugging.  If desired the log format and date format can be specified to
-anything that the logging module supports.
 
-Running pytest specifying formatting options::
+If desired the log and date format can be specified to
+anything that the logging module supports by passing specific formatting options::
 
     pytest --log-format="%(asctime)s %(levelname)s %(message)s" \
             --log-date-format="%Y-%m-%d %H:%M:%S"
@@ -49,14 +35,14 @@ Running pytest specifying formatting options::
 Shows failed tests like so::
 
     ----------------------- Captured stdlog call ----------------------
-    2010-04-10 14:48:44 INFO text going to logger
+    2010-04-10 14:48:44 WARNING text going to logger
     ----------------------- Captured stdout call ----------------------
     text going to stdout
     ----------------------- Captured stderr call ----------------------
     text going to stderr
     ==================== 2 failed in 0.02 seconds =====================
 
-These options can also be customized through a configuration file:
+These options can also be customized through ``pytest.ini`` file:
 
 .. code-block:: ini
 
@@ -69,7 +55,7 @@ with::
 
     pytest --no-print-logs
 
-Or in you ``pytest.ini``:
+Or in the ``pytest.ini`` file:
 
 .. code-block:: ini
 
@@ -85,6 +71,10 @@ Shows failed tests in the normal manner as no logs were captured::
     text going to stderr
     ==================== 2 failed in 0.02 seconds =====================
 
+
+caplog fixture
+^^^^^^^^^^^^^^
+
 Inside tests it is possible to change the log level for the captured log
 messages.  This is supported by the ``caplog`` fixture::
 
@@ -92,7 +82,7 @@ messages.  This is supported by the ``caplog`` fixture::
         caplog.set_level(logging.INFO)
         pass
 
-By default the level is set on the handler used to catch the log messages,
+By default the level is set on the root logger,
 however as a convenience it is also possible to set the log level of any
 logger::
 
@@ -100,14 +90,16 @@ logger::
         caplog.set_level(logging.CRITICAL, logger='root.baz')
         pass
 
+The log levels set are restored automatically at the end of the test.
+
 It is also possible to use a context manager to temporarily change the log
-level::
+level inside a ``with`` block::
 
     def test_bar(caplog):
         with caplog.at_level(logging.INFO):
             pass
 
-Again, by default the level of the handler is affected but the level of any
+Again, by default the level of the root logger is affected but the level of any
 logger can be changed instead with::
 
     def test_bar(caplog):
@@ -115,7 +107,7 @@ logger can be changed instead with::
             pass
 
 Lastly all the logs sent to the logger during the test run are made available on
-the fixture in the form of both the LogRecord instances and the final log text.
+the fixture in the form of both the ``logging.LogRecord`` instances and the final log text.
 This is useful for when you want to assert on the contents of a message::
 
     def test_baz(caplog):
@@ -146,12 +138,41 @@ You can call ``caplog.clear()`` to reset the captured log records in a test::
         your_test_method()
         assert ['Foo'] == [rec.message for rec in caplog.records]
 
+
+The ``caplop.records`` attribute contains records from the current stage only, so
+inside the ``setup`` phase it contains only setup logs, same with the ``call`` and
+``teardown`` phases.
+
+To access logs from other stages, use the ``caplog.get_records(when)`` method. As an example,
+if you want to make sure that tests which use a certain fixture never log any warnings, you can inspect
+the records for the ``setup`` and ``call`` stages during teardown like so:
+
+.. code-block:: python
+
+
+    @pytest.fixture
+    def window(caplog):
+        window = create_window()
+        yield window
+        for when in ('setup', 'call'):
+            messages = [x.message for x in caplog.get_records(when) if x.level == logging.WARNING]
+            if messages:
+                pytest.fail('warning messages encountered during testing: {}'.format(messages))
+
+
+caplog fixture API
+~~~~~~~~~~~~~~~~~~
+
+.. autoclass:: _pytest.logging.LogCaptureFixture
+    :members:
+
+.. _live_logs:
+
 Live Logs
 ^^^^^^^^^
 
-By default, pytest will output any logging records with a level higher or
+By setting the :confval:`log_cli` configuration option to ``true``, pytest will output
-equal to WARNING. In order to actually see these logs in the console you have to
+logging records as they are emitted directly into the console.
-disable pytest output capture by passing ``-s``.
 
 You can specify the logging level for which log records with equal or higher
 level are printed to the console by passing ``--log-cli-level``. This setting
@@ -191,11 +212,48 @@ option names are:
 * ``log_file_format``
 * ``log_file_date_format``
 
-Accessing logs from other test stages
+.. _log_release_notes:
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-The ``caplop.records`` fixture contains records from the current stage only. So
+Release notes
-inside the setup phase it contains only setup logs, same with the call and
+^^^^^^^^^^^^^
-teardown phases. To access logs from other stages you can use
+
-``caplog.get_handler('setup').records``. Valid stages are ``setup``, ``call``
+This feature was introduced as a drop-in replacement for the `pytest-catchlog
-and ``teardown``.
+<https://pypi.org/project/pytest-catchlog/>`_ plugin and they conflict
+with each other. The backward compatibility API with ``pytest-capturelog``
+has been dropped when this feature was introduced, so if for that reason you
+still need ``pytest-catchlog`` you can disable the internal feature by
+adding to your ``pytest.ini``:
+
+.. code-block:: ini
+
+   [pytest]
+       addopts=-p no:logging
+
+
+.. _log_changes_3_4:
+
+Incompatible changes in pytest 3.4
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+This feature was introduced in ``3.3`` and some **incompatible changes** have been
+made in ``3.4`` after community feedback:
+
+* Log levels are no longer changed unless explicitly requested by the :confval:`log_level` configuration
+  or ``--log-level`` command-line options. This allows users to configure logger objects themselves.
+* :ref:`Live Logs <live_logs>` is now disabled by default and can be enabled setting the
+  :confval:`log_cli` configuration option to ``true``. When enabled, the verbosity is increased so logging for each
+  test is visible.
+* :ref:`Live Logs <live_logs>` are now sent to ``sys.stdout`` and no longer require the ``-s`` command-line option
+  to work.
+
+If you want to partially restore the logging behavior of version ``3.3``, you can add this options to your ``ini``
+file:
+
+.. code-block:: ini
+
+    [pytest]
+    log_cli=true
+    log_level=NOTSET
+
+More details about the discussion that lead to this changes can be read in
+issue `#3013 <https://github.com/pytest-dev/pytest/issues/3013>`_.

testing/logging/test_fixture.py

@@ -27,6 +27,30 @@ def test_change_level(caplog):
     assert 'CRITICAL' in caplog.text
 
 
+def test_change_level_undo(testdir):
+    """Ensure that 'set_level' is undone after the end of the test"""
+    testdir.makepyfile('''
+        import logging
+
+        def test1(caplog):
+            caplog.set_level(logging.INFO)
+            # using + operator here so fnmatch_lines doesn't match the code in the traceback
+            logging.info('log from ' + 'test1')
+            assert 0
+
+        def test2(caplog):
+            # using + operator here so fnmatch_lines doesn't match the code in the traceback
+            logging.info('log from ' + 'test2')
+            assert 0
+    ''')
+    result = testdir.runpytest_subprocess()
+    result.stdout.fnmatch_lines([
+        '*log from test1*',
+        '*2 failed in *',
+    ])
+    assert 'log from test2' not in result.stdout.str()
+
+
 def test_with_statement(caplog):
     with caplog.at_level(logging.INFO):
         logger.debug('handler DEBUG level')
@@ -43,6 +67,7 @@ def test_with_statement(caplog):
 
 
 def test_log_access(caplog):
+    caplog.set_level(logging.INFO)
     logger.info('boo %s', 'arg')
     assert caplog.records[0].levelname == 'INFO'
     assert caplog.records[0].msg == 'boo %s'
@@ -50,6 +75,7 @@ def test_log_access(caplog):
 
 
 def test_record_tuples(caplog):
+    caplog.set_level(logging.INFO)
     logger.info('boo %s', 'arg')
 
     assert caplog.record_tuples == [
@@ -58,6 +84,7 @@ def test_record_tuples(caplog):
 
 
 def test_unicode(caplog):
+    caplog.set_level(logging.INFO)
     logger.info(u'bū')
     assert caplog.records[0].levelname == 'INFO'
     assert caplog.records[0].msg == u'bū'
@@ -65,6 +92,7 @@ def test_unicode(caplog):
 
 
 def test_clear(caplog):
+    caplog.set_level(logging.INFO)
     logger.info(u'bū')
     assert len(caplog.records)
     caplog.clear()
@@ -73,19 +101,20 @@ def test_clear(caplog):
 
 @pytest.fixture
 def logging_during_setup_and_teardown(caplog):
+    caplog.set_level('INFO')
     logger.info('a_setup_log')
     yield
     logger.info('a_teardown_log')
-    assert [x.message for x in caplog.get_handler('teardown').records] == ['a_teardown_log']
+    assert [x.message for x in caplog.get_records('teardown')] == ['a_teardown_log']
 
 
 def test_caplog_captures_for_all_stages(caplog, logging_during_setup_and_teardown):
     assert not caplog.records
-    assert not caplog.get_handler('call').records
+    assert not caplog.get_records('call')
     logger.info('a_call_log')
-    assert [x.message for x in caplog.get_handler('call').records] == ['a_call_log']
+    assert [x.message for x in caplog.get_records('call')] == ['a_call_log']
 
-    assert [x.message for x in caplog.get_handler('setup').records] == ['a_setup_log']
+    assert [x.message for x in caplog.get_records('setup')] == ['a_setup_log']
 
     # This reachers into private API, don't use this type of thing in real tests!
     assert set(caplog._item.catch_log_handlers.keys()) == {'setup', 'call'}

testing/logging/test_reporting.py

@@ -1,5 +1,8 @@
 # -*- coding: utf-8 -*-
 import os
+
+import six
+
 import pytest
 
 
@@ -35,7 +38,7 @@ def test_messages_logged(testdir):
             logger.info('text going to logger')
             assert False
         ''')
-    result = testdir.runpytest()
+    result = testdir.runpytest('--log-level=INFO')
     assert result.ret == 1
     result.stdout.fnmatch_lines(['*- Captured *log call -*',
                                  '*text going to logger*'])
@@ -58,7 +61,7 @@ def test_setup_logging(testdir):
             logger.info('text going to logger from call')
             assert False
         ''')
-    result = testdir.runpytest()
+    result = testdir.runpytest('--log-level=INFO')
     assert result.ret == 1
     result.stdout.fnmatch_lines(['*- Captured *log setup -*',
                                  '*text going to logger from setup*',
@@ -79,7 +82,7 @@ def test_teardown_logging(testdir):
             logger.info('text going to logger from teardown')
             assert False
         ''')
-    result = testdir.runpytest()
+    result = testdir.runpytest('--log-level=INFO')
     assert result.ret == 1
     result.stdout.fnmatch_lines(['*- Captured *log call -*',
                                  '*text going to logger from call*',
@@ -141,6 +144,30 @@ def test_disable_log_capturing_ini(testdir):
         result.stdout.fnmatch_lines(['*- Captured *log call -*'])
 
 
+@pytest.mark.parametrize('enabled', [True, False])
+def test_log_cli_enabled_disabled(testdir, enabled):
+    msg = 'critical message logged by test'
+    testdir.makepyfile('''
+        import logging
+        def test_log_cli():
+            logging.critical("{}")
+    '''.format(msg))
+    if enabled:
+        testdir.makeini('''
+            [pytest]
+            log_cli=true
+        ''')
+    result = testdir.runpytest()
+    if enabled:
+        result.stdout.fnmatch_lines([
+            'test_log_cli_enabled_disabled.py::test_log_cli ',
+            'test_log_cli_enabled_disabled.py* CRITICAL critical message logged by test',
+            'PASSED*',
+        ])
+    else:
+        assert msg not in result.stdout.str()
+
+
 def test_log_cli_default_level(testdir):
     # Default log file level
     testdir.makepyfile('''
@@ -148,32 +175,103 @@ def test_log_cli_default_level(testdir):
         import logging
         def test_log_cli(request):
             plugin = request.config.pluginmanager.getplugin('logging-plugin')
-            assert plugin.log_cli_handler.level == logging.WARNING
+            assert plugin.log_cli_handler.level == logging.NOTSET
-            logging.getLogger('catchlog').info("This log message won't be shown")
+            logging.getLogger('catchlog').info("INFO message won't be shown")
-            logging.getLogger('catchlog').warning("This log message will be shown")
+            logging.getLogger('catchlog').warning("WARNING message will be shown")
-            print('PASSED')
+    ''')
+    testdir.makeini('''
+        [pytest]
+        log_cli=true
     ''')
 
-    result = testdir.runpytest('-s')
+    result = testdir.runpytest()
 
     # fnmatch_lines does an assertion internally
     result.stdout.fnmatch_lines([
-        'test_log_cli_default_level.py PASSED',
+        'test_log_cli_default_level.py::test_log_cli ',
+        'test_log_cli_default_level.py*WARNING message will be shown*',
     ])
-    result.stderr.fnmatch_lines([
+    assert "INFO message won't be shown" not in result.stdout.str()
-        "* This log message will be shown"
-    ])
-    for line in result.errlines:
-        try:
-            assert "This log message won't be shown" in line
-            pytest.fail("A log message was shown and it shouldn't have been")
-        except AssertionError:
-            continue
-
     # make sure that that we get a '0' exit code for the testsuite
     assert result.ret == 0
 
 
+def test_log_cli_default_level_multiple_tests(testdir, request):
+    """Ensure we reset the first newline added by the live logger between tests"""
+    filename = request.node.name + '.py'
+    testdir.makepyfile('''
+        import logging
+
+        def test_log_1():
+            logging.warning("log message from test_log_1")
+
+        def test_log_2():
+            logging.warning("log message from test_log_2")
+    ''')
+    testdir.makeini('''
+        [pytest]
+        log_cli=true
+    ''')
+
+    result = testdir.runpytest()
+    result.stdout.fnmatch_lines([
+        '{}::test_log_1 '.format(filename),
+        '*WARNING*log message from test_log_1*',
+        'PASSED *50%*',
+        '{}::test_log_2 '.format(filename),
+        '*WARNING*log message from test_log_2*',
+        'PASSED *100%*',
+        '=* 2 passed in *=',
+    ])
+
+
+def test_log_cli_default_level_sections(testdir, request):
+    """Check that with live logging enable we are printing the correct headers during setup/call/teardown."""
+    filename = request.node.name + '.py'
+    testdir.makepyfile('''
+        import pytest
+        import logging
+
+        @pytest.fixture
+        def fix(request):
+            logging.warning("log message from setup of {}".format(request.node.name))
+            yield
+            logging.warning("log message from teardown of {}".format(request.node.name))
+
+        def test_log_1(fix):
+            logging.warning("log message from test_log_1")
+
+        def test_log_2(fix):
+            logging.warning("log message from test_log_2")
+    ''')
+    testdir.makeini('''
+        [pytest]
+        log_cli=true
+    ''')
+
+    result = testdir.runpytest()
+    result.stdout.fnmatch_lines([
+        '{}::test_log_1 '.format(filename),
+        '*-- live log setup --*',
+        '*WARNING*log message from setup of test_log_1*',
+        '*-- live log call --*',
+        '*WARNING*log message from test_log_1*',
+        'PASSED *50%*',
+        '*-- live log teardown --*',
+        '*WARNING*log message from teardown of test_log_1*',
+
+        '{}::test_log_2 '.format(filename),
+        '*-- live log setup --*',
+        '*WARNING*log message from setup of test_log_2*',
+        '*-- live log call --*',
+        '*WARNING*log message from test_log_2*',
+        'PASSED *100%*',
+        '*-- live log teardown --*',
+        '*WARNING*log message from teardown of test_log_2*',
+        '=* 2 passed in *=',
+    ])
+
+
 def test_log_cli_level(testdir):
     # Default log file level
     testdir.makepyfile('''
@@ -186,22 +284,19 @@ def test_log_cli_level(testdir):
             logging.getLogger('catchlog').info("This log message will be shown")
             print('PASSED')
     ''')
+    testdir.makeini('''
+        [pytest]
+        log_cli=true
+    ''')
 
     result = testdir.runpytest('-s', '--log-cli-level=INFO')
 
     # fnmatch_lines does an assertion internally
     result.stdout.fnmatch_lines([
-        'test_log_cli_level.py PASSED',
+        'test_log_cli_level.py*This log message will be shown',
+        'PASSED',  # 'PASSED' on its own line because the log message prints a new line
     ])
-    result.stderr.fnmatch_lines([
+    assert "This log message won't be shown" not in result.stdout.str()
-        "* This log message will be shown"
-    ])
-    for line in result.errlines:
-        try:
-            assert "This log message won't be shown" in line
-            pytest.fail("A log message was shown and it shouldn't have been")
-        except AssertionError:
-            continue
 
     # make sure that that we get a '0' exit code for the testsuite
     assert result.ret == 0
@@ -210,17 +305,10 @@ def test_log_cli_level(testdir):
 
     # fnmatch_lines does an assertion internally
     result.stdout.fnmatch_lines([
-        'test_log_cli_level.py PASSED',
+        'test_log_cli_level.py* This log message will be shown',
+        'PASSED',  # 'PASSED' on its own line because the log message prints a new line
     ])
-    result.stderr.fnmatch_lines([
+    assert "This log message won't be shown" not in result.stdout.str()
-        "* This log message will be shown"
-    ])
-    for line in result.errlines:
-        try:
-            assert "This log message won't be shown" in line
-            pytest.fail("A log message was shown and it shouldn't have been")
-        except AssertionError:
-            continue
 
     # make sure that that we get a '0' exit code for the testsuite
     assert result.ret == 0
@@ -230,6 +318,7 @@ def test_log_cli_ini_level(testdir):
     testdir.makeini(
         """
         [pytest]
+        log_cli=true
         log_cli_level = INFO
         """)
     testdir.makepyfile('''
@@ -247,17 +336,10 @@ def test_log_cli_ini_level(testdir):
 
     # fnmatch_lines does an assertion internally
     result.stdout.fnmatch_lines([
-        'test_log_cli_ini_level.py PASSED',
+        'test_log_cli_ini_level.py* This log message will be shown',
+        'PASSED',  # 'PASSED' on its own line because the log message prints a new line
     ])
-    result.stderr.fnmatch_lines([
+    assert "This log message won't be shown" not in result.stdout.str()
-        "* This log message will be shown"
-    ])
-    for line in result.errlines:
-        try:
-            assert "This log message won't be shown" in line
-            pytest.fail("A log message was shown and it shouldn't have been")
-        except AssertionError:
-            continue
 
     # make sure that that we get a '0' exit code for the testsuite
     assert result.ret == 0
@@ -278,7 +360,7 @@ def test_log_file_cli(testdir):
 
     log_file = testdir.tmpdir.join('pytest.log').strpath
 
-    result = testdir.runpytest('-s', '--log-file={0}'.format(log_file))
+    result = testdir.runpytest('-s', '--log-file={0}'.format(log_file), '--log-file-level=WARNING')
 
     # fnmatch_lines does an assertion internally
     result.stdout.fnmatch_lines([
@@ -327,6 +409,16 @@ def test_log_file_cli_level(testdir):
         assert "This log message won't be shown" not in contents
 
 
+def test_log_level_not_changed_by_default(testdir):
+    testdir.makepyfile('''
+        import logging
+        def test_log_file():
+            assert logging.getLogger().level == logging.WARNING
+    ''')
+    result = testdir.runpytest('-s')
+    result.stdout.fnmatch_lines('* 1 passed in *')
+
+
 def test_log_file_ini(testdir):
     log_file = testdir.tmpdir.join('pytest.log').strpath
 
@@ -334,6 +426,7 @@ def test_log_file_ini(testdir):
         """
         [pytest]
         log_file={0}
+        log_file_level=WARNING
         """.format(log_file))
     testdir.makepyfile('''
         import pytest
@@ -396,3 +489,53 @@ def test_log_file_ini_level(testdir):
         contents = rfh.read()
         assert "This log message will be shown" in contents
         assert "This log message won't be shown" not in contents
+
+
+@pytest.mark.parametrize('has_capture_manager', [True, False])
+def test_live_logging_suspends_capture(has_capture_manager, request):
+    """Test that capture manager is suspended when we emitting messages for live logging.
+
+    This tests the implementation calls instead of behavior because it is difficult/impossible to do it using
+    ``testdir`` facilities because they do their own capturing.
+
+    We parametrize the test to also make sure _LiveLoggingStreamHandler works correctly if no capture manager plugin
+    is installed.
+    """
+    import logging
+    from functools import partial
+    from _pytest.capture import CaptureManager
+    from _pytest.logging import _LiveLoggingStreamHandler
+
+    class MockCaptureManager:
+        calls = []
+
+        def suspend_global_capture(self):
+            self.calls.append('suspend_global_capture')
+
+        def resume_global_capture(self):
+            self.calls.append('resume_global_capture')
+
+    # sanity check
+    assert CaptureManager.suspend_capture_item
+    assert CaptureManager.resume_global_capture
+
+    class DummyTerminal(six.StringIO):
+
+        def section(self, *args, **kwargs):
+            pass
+
+    out_file = DummyTerminal()
+    capture_manager = MockCaptureManager() if has_capture_manager else None
+    handler = _LiveLoggingStreamHandler(out_file, capture_manager)
+    handler.set_when('call')
+
+    logger = logging.getLogger(__name__ + '.test_live_logging_suspends_capture')
+    logger.addHandler(handler)
+    request.addfinalizer(partial(logger.removeHandler, handler))
+
+    logger.critical('some message')
+    if has_capture_manager:
+        assert MockCaptureManager.calls == ['suspend_global_capture', 'resume_global_capture']
+    else:
+        assert MockCaptureManager.calls == []
+    assert out_file.getvalue() == '\nsome message\n'