Review Request 57700: Modified a test to also check if the data was written to the volume.

[Anand Mazumdar]

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Review request for mesos and Gilbert Song.


Repository: mesos


Description
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Previously, it was possbile that the directory exists but does not
link to the persistent volume.


Diffs
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  src/tests/default_executor_tests.cpp b701e7d2f11af91a94d57db53ac2904e301996f1 


Diff: https://reviews.apache.org/r/57700/diff/1/


Testing
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make check


Thanks,

Anand Mazumdar