test_du_diskcollector fails on macOS

                         def _run_collector_tests(collector, target, wait):
                           assert collector.value == 0

                           collector.sample()
                           wait()
                           assert collector.value == 0

                           f1 = make_file(TEST_AMOUNT_1, dir=target)
                           wait()
                     >     assert collector.value >= TEST_AMOUNT_1.as_(Data.BYTES)
                     E     assert 96468992 >= 104857600.0
                     E      +  where 96468992 = <apache.thermos.monitoring.disk.DiskCollector object at 0x112323290>.value
                     E      +  and   104857600.0 = <bound method Amount.as_ of Amount(100, MB)>(<twitter.common.quantity.Data object at 0x111119e90>)
                     E      +    where <bound method Amount.as_ of Amount(100, MB)> = Amount(100, MB).as_
...skipping...
                     E      +    and   <twitter.common.quantity.Data object at 0x111119e90> = Data.BYTES