Move logging tests to dedicated test file

tests/test_log_setup.py

@@ -0,0 +1,130 @@
+import logging
+import sys
+from pathlib import Path
+
+import pytest
+
+from freqtrade.exceptions import OperationalException
+from freqtrade.loggers import (FTBufferingHandler, FTStdErrStreamHandler, _set_loggers,
+                               setup_logging, setup_logging_pre)
+
+
+def test_set_loggers() -> None:
+    # Reset Logging to Debug, otherwise this fails randomly as it's set globally
+    logging.getLogger('requests').setLevel(logging.DEBUG)
+    logging.getLogger("urllib3").setLevel(logging.DEBUG)
+    logging.getLogger('ccxt.base.exchange').setLevel(logging.DEBUG)
+    logging.getLogger('telegram').setLevel(logging.DEBUG)
+
+    previous_value1 = logging.getLogger('requests').level
+    previous_value2 = logging.getLogger('ccxt.base.exchange').level
+    previous_value3 = logging.getLogger('telegram').level
+
+    _set_loggers()
+
+    value1 = logging.getLogger('requests').level
+    assert previous_value1 is not value1
+    assert value1 is logging.INFO
+
+    value2 = logging.getLogger('ccxt.base.exchange').level
+    assert previous_value2 is not value2
+    assert value2 is logging.INFO
+
+    value3 = logging.getLogger('telegram').level
+    assert previous_value3 is not value3
+    assert value3 is logging.INFO
+
+    _set_loggers(verbosity=2)
+
+    assert logging.getLogger('requests').level is logging.DEBUG
+    assert logging.getLogger('ccxt.base.exchange').level is logging.INFO
+    assert logging.getLogger('telegram').level is logging.INFO
+    assert logging.getLogger('werkzeug').level is logging.INFO
+
+    _set_loggers(verbosity=3, api_verbosity='error')
+
+    assert logging.getLogger('requests').level is logging.DEBUG
+    assert logging.getLogger('ccxt.base.exchange').level is logging.DEBUG
+    assert logging.getLogger('telegram').level is logging.INFO
+    assert logging.getLogger('werkzeug').level is logging.ERROR
+
+
+@pytest.mark.skipif(sys.platform == "win32", reason="does not run on windows")
+def test_set_loggers_syslog():
+    logger = logging.getLogger()
+    orig_handlers = logger.handlers
+    logger.handlers = []
+
+    config = {'verbosity': 2,
+              'logfile': 'syslog:/dev/log',
+              }
+
+    setup_logging_pre()
+    setup_logging(config)
+    assert len(logger.handlers) == 3
+    assert [x for x in logger.handlers if type(x) == logging.handlers.SysLogHandler]
+    assert [x for x in logger.handlers if type(x) == FTStdErrStreamHandler]
+    assert [x for x in logger.handlers if type(x) == FTBufferingHandler]
+    # setting up logging again should NOT cause the loggers to be added a second time.
+    setup_logging(config)
+    assert len(logger.handlers) == 3
+    # reset handlers to not break pytest
+    logger.handlers = orig_handlers
+
+
+@pytest.mark.skipif(sys.platform == "win32", reason="does not run on windows")
+def test_set_loggers_Filehandler(tmpdir):
+    logger = logging.getLogger()
+    orig_handlers = logger.handlers
+    logger.handlers = []
+    logfile = Path(tmpdir) / 'ft_logfile.log'
+    config = {'verbosity': 2,
+              'logfile': str(logfile),
+              }
+
+    setup_logging_pre()
+    setup_logging(config)
+    assert len(logger.handlers) == 3
+    assert [x for x in logger.handlers if type(x) == logging.handlers.RotatingFileHandler]
+    assert [x for x in logger.handlers if type(x) == FTStdErrStreamHandler]
+    assert [x for x in logger.handlers if type(x) == FTBufferingHandler]
+    # setting up logging again should NOT cause the loggers to be added a second time.
+    setup_logging(config)
+    assert len(logger.handlers) == 3
+    # reset handlers to not break pytest
+    if logfile.exists:
+        logfile.unlink()
+    logger.handlers = orig_handlers
+
+
+@pytest.mark.skip(reason="systemd is not installed on every system, so we're not testing this.")
+def test_set_loggers_journald(mocker):
+    logger = logging.getLogger()
+    orig_handlers = logger.handlers
+    logger.handlers = []
+
+    config = {'verbosity': 2,
+              'logfile': 'journald',
+              }
+
+    setup_logging_pre()
+    setup_logging(config)
+    assert len(logger.handlers) == 3
+    assert [x for x in logger.handlers if type(x).__name__ == "JournaldLogHandler"]
+    assert [x for x in logger.handlers if type(x) == FTStdErrStreamHandler]
+    # reset handlers to not break pytest
+    logger.handlers = orig_handlers
+
+
+def test_set_loggers_journald_importerror(import_fails):
+    logger = logging.getLogger()
+    orig_handlers = logger.handlers
+    logger.handlers = []
+
+    config = {'verbosity': 2,
+              'logfile': 'journald',
+              }
+    with pytest.raises(OperationalException,
+                       match=r'You need the cysystemd python package.*'):
+        setup_logging(config)
+    logger.handlers = orig_handlers