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https://issues.apache.org/jira/browse/HDFS-13925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16647235#comment-16647235
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Konstantin Shvachko commented on HDFS-13925:
--------------------------------------------

Comments on patch v3:
# Should not import all assert methods, like {{Assertions.*}}, when you need 
only one {{fail()}}.
# Looks like you picked a wrong {{fail()}} method. It should be 
{{org.junit.Assert.fail}} rather than {{org.assertj}}.
# What is the reason for resetting {{setObserverRead(false)}}? The {{setUp()}} 
method sets {{setObserverRead(true)}} before every test case, which should work 
for you cases?

> Unit Test for transitioning between different states
> ----------------------------------------------------
>
>                 Key: HDFS-13925
>                 URL: https://issues.apache.org/jira/browse/HDFS-13925
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Sherwood Zheng
>            Assignee: Sherwood Zheng
>            Priority: Major
>         Attachments: HDFS-13925-HDFS-12943.000.patch, 
> HDFS-13925-HDFS-12943.001.patch, HDFS-13925-HDFS-12943.002.patch, 
> HDFS-13925-HDFS-12943.003.patch
>
>
> adding two unit tests:
> 1. Ensure that Active cannot be transitioned to Observer and vice versa.
> 2. Ensure that Observer can be transitioned to Standby and vice versa.



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