Method logs_present

python/python3/tornado/test/log_test.py:199–215

(self, statement, args=None)

    """Test the ability to enable and disable Tornado's logging hooks."""

    def logs_present(self, statement, args=None):
        # Each test may manipulate and/or parse the options and then logs
        # a line at the 'info' level.  This level is ignored in the
        # logging module by default, but Tornado turns it on by default
        # so it is the easiest way to tell whether tornado's logging hooks
        # ran.
        IMPORT = "from tornado.options import options, parse_command_line"
        LOG_INFO = 'import logging; logging.info("hello")'
        program = ";".join([IMPORT, statement, LOG_INFO])
        proc = subprocess.Popen(
            [sys.executable, "-c", program] + (args or []),
            stdout=subprocess.PIPE,
            stderr=subprocess.STDOUT,
        )
        stdout, stderr = proc.communicate()
        self.assertEqual(proc.returncode, 0, "process failed: %r" % stdout)
        return b"hello" in stdout

    def test_default(self):
        self.assertFalse(self.logs_present("pass"))