How should I verify that a log message did not trigger when testing Python code?

Question

This answer https://stackoverflow.com/a/34920727 deals with testing log outputs

But what if I want to test that messages did not trigger, how do I do that. I am using unittest. For example:

    def test_HandlerEnabled(self):
        with self.assertLogs(level='DEBUG') as fake_log:
            uut=myHandler.Setup(tag="foo", enabled=True, out_stream='log')
            uut.Debug("testing")
        self.assertEqual(fake_log.output, ["DEBUG:root:foo: testing"])

    def test_HandlerDisabled(self):
        with self.assertLogs(level='DEBUG') as fake_log:
            uut=myHandler.Setup(tag="foo", enabled=False, out_stream='log')
            uut.Debug("testing")

        self.AssertThatNoLogsTriggeredOnRoot(fake_log.output) # <<<<<<<<<< here

I hereby, confirm that I have attempted to find an answer to this question myself.

@zvone even if I were to use caplog from pytest, what method allows me to check that nothing triggered on the logs? — deadParrot
– deadParrot, Commented Sep 7, 2023 at 13:08
Adapt some of the code in plumberjack.blogspot.com/2010/09/unit-testing-and-logging.html — Vinay Sajip
– Vinay Sajip, Commented Sep 7, 2023 at 20:00

deadParrot · Accepted Answer · 2023-09-11 11:19:58Z

0

In my case, I had to upgrade to python 3.11 so I could use assertNoLogs:

def test_HandlerDisabled(self):
    with self.assertLogs(level='DEBUG') as fake_log:
        uut=myHandler.Setup(tag="foo", enabled=False, out_stream='log')
        uut.Debug("testing")
        self.assertNoLogs('root', level = 'DEBUG') #<<<<<< use this

For previous versions, as @frankfalse suggests, implement your own method. Example here: https://stackoverflow.com/a/61381576/9962617

answered Sep 11, 2023 at 11:19

deadParrot

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