test_cache_wrapper.py 文件源码

def test_wrapper_incr_safety(self):
        # get the default cache
        cache = caches['default']

        # it should fail not because of our wrapper
        with assert_raises(ValueError) as ex:
            cache.incr('missing_key')

        # the error is not caused by our tracer
        eq_(ex.exception.args[0], "Key 'missing_key' not found")
        # an error trace must be sent
        spans = self.tracer.writer.pop()
        eq_(len(spans), 2)
        span = spans[0]
        eq_(span.resource, 'incr')
        eq_(span.name, 'django.cache')
        eq_(span.span_type, 'cache')
        eq_(span.error, 1)