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import sys
from logging import FileHandler, Formatter, Handler, NullHandler, StreamHandler
import pytest
from loguru import logger
def test_stream_handler(capsys):
logger.add(StreamHandler(sys.stderr), format="{level} {message}")
logger.info("test")
logger.remove()
logger.warning("nope")
out, err = capsys.readouterr()
assert out == ""
assert err == "INFO test\n"
def test_file_handler(tmp_path):
file = tmp_path / "test.log"
logger.add(FileHandler(str(file)), format="{message} {level.name}")
logger.info("test")
logger.remove()
logger.warning("nope")
assert file.read_text() == "test INFO\n"
def test_null_handler(capsys):
logger.add(NullHandler())
logger.error("nope")
logger.remove()
out, err = capsys.readouterr()
assert out == ""
assert err == ""
def test_extra_dict(capsys):
handler = StreamHandler(sys.stdout)
formatter = Formatter("%(extra)s %(message)s")
handler.setFormatter(formatter)
logger.add(handler, format="<{extra[abc]}> {message}", catch=False)
logger.bind(abc=123).info("Extra!")
out, err = capsys.readouterr()
assert out == "{'abc': 123} <123> Extra!\n"
assert err == ""
def test_no_conflict_with_extra_dict(capsys):
handler = StreamHandler(sys.stdout)
logger.add(handler, format="{message}", catch=False)
logger.bind(args=True, name="foobar", message="Wut?").info("OK!")
out, err = capsys.readouterr()
assert out == "OK!\n"
assert err == ""
def test_no_exception():
result = None
class NoExceptionHandler(Handler):
def emit(self, record):
nonlocal result
result = bool(not record.exc_info)
logger.add(NoExceptionHandler())
try:
1 / 0 # noqa: B018
except ZeroDivisionError:
logger.exception("Error")
assert result is False
def test_exception(capsys):
result = None
class ExceptionHandler(Handler):
def emit(self, record):
nonlocal result
result = bool(record.exc_info)
logger.add(ExceptionHandler())
try:
1 / 0 # noqa: B018
except ZeroDivisionError:
logger.exception("Error")
assert result is True
def test_exception_formatting(tmp_path):
file = tmp_path / "test.log"
logger.add(FileHandler(str(file)), format="{message}")
try:
1 / 0 # noqa: B018
except ZeroDivisionError:
logger.exception("Error")
result = file.read_text()
lines = result.strip().splitlines()
error = "ZeroDivisionError: division by zero"
assert lines[1].startswith("Traceback")
assert lines[-1] == error
assert result.count(error) == 1
@pytest.mark.parametrize("dynamic_format", [False, True])
def test_standard_formatter(capsys, dynamic_format):
def format_(x):
return "{level.no} {message} [Not Chopped]"
if not dynamic_format:
format_ = format_(None)
handler = StreamHandler(sys.stdout)
formatter = Formatter("%(message)s %(levelname)s")
handler.setFormatter(formatter)
logger.add(handler, format=format_)
logger.info("Test")
out, err = capsys.readouterr()
assert out == "20 Test [Not Chopped] INFO\n"
assert err == ""
@pytest.mark.parametrize("dynamic_format", [False, True])
def test_standard_formatter_with_new_line(capsys, dynamic_format):
def format_(x):
return "{level.no} {message}\n"
if not dynamic_format:
format_ = format_(None)
handler = StreamHandler(sys.stdout)
formatter = Formatter("%(message)s %(levelname)s")
handler.setFormatter(formatter)
logger.add(handler, format=format_)
logger.info("Test")
out, err = capsys.readouterr()
assert out == "20 Test\n INFO\n"
assert err == ""
@pytest.mark.parametrize("dynamic_format", [False, True])
def test_raw_standard_formatter(capsys, dynamic_format):
def format_(x):
return "{level.no} {message} [Not Chopped]"
if not dynamic_format:
format_ = format_(None)
handler = StreamHandler(sys.stdout)
formatter = Formatter("%(message)s %(levelname)s")
handler.setFormatter(formatter)
logger.add(handler, format=format_)
logger.opt(raw=True).info("Test")
out, err = capsys.readouterr()
assert out == "Test INFO\n"
assert err == ""
@pytest.mark.parametrize("dynamic_format", [False, True])
def test_raw_standard_formatter_with_new_line(capsys, dynamic_format):
def format_(x):
return "{level.no} {message}\n"
if not dynamic_format:
format_ = format_(None)
handler = StreamHandler(sys.stdout)
formatter = Formatter("%(message)s %(levelname)s")
handler.setFormatter(formatter)
logger.add(handler, format=format_)
logger.opt(raw=True).info("Test")
out, err = capsys.readouterr()
assert out == "Test INFO\n"
assert err == ""
def test_standard_formatter_with_non_standard_level_name(capsys):
handler = StreamHandler(sys.stdout)
formatter = Formatter("%(levelno)s | %(levelname)s | %(message)s")
handler.setFormatter(formatter)
logger.add(handler, format="{message}")
logger.success("Test")
out, err = capsys.readouterr()
assert out == "25 | SUCCESS | Test\n"
assert err == ""
def test_standard_formatter_with_custom_level_name(capsys):
handler = StreamHandler(sys.stdout)
formatter = Formatter("%(levelno)s | %(levelname)s | %(message)s")
handler.setFormatter(formatter)
logger.add(handler, format="{message}")
logger.level("CUSTOM", no=35)
logger.log("CUSTOM", "Test")
out, err = capsys.readouterr()
assert out == "35 | CUSTOM | Test\n"
assert err == ""
def test_standard_formatter_with_unregistered_level(capsys):
handler = StreamHandler(sys.stdout)
formatter = Formatter("%(levelno)s | %(levelname)s | %(message)s")
handler.setFormatter(formatter)
logger.add(handler, format="{message}")
logger.log(45, "Test")
out, err = capsys.readouterr()
assert out == "45 | Level 45 | Test\n"
assert err == ""
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