How to mock the self. update in unit test

[umaparvat]

how to write a unit test for this .

@celery.task(bind=True)
def long_task(self):
    """Background task that runs a long function with progress reports."""
    verb = ['Starting up', 'Booting', 'Repairing', 'Loading', 'Checking']
    adjective = ['master', 'radiant', 'silent', 'harmonic', 'fast']
    noun = ['solar array', 'particle reshaper', 'cosmic ray', 'orbiter', 'bit']
    message = ''
    total = random.randint(10, 50)
    for i in range(total):
        if not message or random.random() < 0.25:
            message = '{0} {1} {2}...'.format(random.choice(verb),
                                              random.choice(adjective),
                                              random.choice(noun))
        self.update_state(state='PROGRESS',
                          meta={'current': i, 'total': total,
                                'status': message})
        time.sleep(1)
    return {'current': 100, 'total': 100, 'status': 'Task completed!',
            'result': 42}

When i write a unit test, it fails at unable to open the database file. fails at update_state line.

def test_long_task(self, mocker):
        s = mocker.patch('service.random.randint')
        s.return_value = 5
        res = service.long_task()
        assert res == {'current': 100, 'total': 100, 'status': 'Task completed!',
            'result': 42}

PS: i've used the same code and must to write a unit test for sonarqube coverage and for my CI/CD pipeline. There it fails with error as unable to connect with database. i've used sqlite for celery backend instead of redis.

[miguelgrinberg]

What's the error that you are getting? Copy the entire thing, including the stack trace please.