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https://issues.apache.org/jira/browse/HADOOP-13793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15634713#comment-15634713
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Mingliang Liu commented on HADOOP-13793:
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Implementing an S3Client wrapper is more feasible than implementing an S3 
simulator, for the purpose of delaying request. In my prior experience, I 
hacked fake-s3 (one of S3 simulators) tool for some tests; we don't want to 
shadow all S3 changes by ourselves.

Mokito here may not be helpful either.

This is heavily needed for S3Guard testing I think. +1 for the proposal.


> s3guard: add inconsistency injection, integration tests
> -------------------------------------------------------
>
>                 Key: HADOOP-13793
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13793
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Aaron Fabbri
>
> Many of us share concerns that testing the consistency features of S3Guard 
> will be difficult if we depend on the rare and unpredictable occurrence of 
> actual inconsistency in S3 to exercise those code paths.
> I think we should have a mechanism for injecting failure to force exercising 
> of the consistency codepaths in S3Guard.
> Requirements:
> - Integration tests that cause S3A to see the types of inconsistency we 
> address with S3Guard.
> - These are deterministic integration tests.
> Unit tests are possible as well, if we were to stub out the S3Client.  That 
> may be less bang for the buck, though.



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