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https://issues.apache.org/jira/browse/DERBY-4089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680521#action_12680521
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Rick Hillegas commented on DERBY-4089:
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Hi Kristian,

Technically, I think that we should run the tests against both the sane and the 
insane jars. One configuration verifies the production configuration. The other 
verifies some assumptions. But over the last 4 years we haven't seen a lot of 
difference in tests run against sane vs. insane jars. I would say that we have 
seen a number of cases where the jar tests broke even though the classpath 
tests succeeded.

> It should be possible to run unit tests right after "ant all"
> -------------------------------------------------------------
>
>                 Key: DERBY-4089
>                 URL: https://issues.apache.org/jira/browse/DERBY-4089
>             Project: Derby
>          Issue Type: Improvement
>          Components: Build tools
>    Affects Versions: 10.4.2.0
>            Reporter: Aaron Digulla
>
> Right now, the property "derby.junit.classpath" is empty by default. There 
> should be an ant target which sets the correct classpath to run all tests 
> after an initial checkout and "ant all".
> The current situation is very confusing to beginners and people who try to 
> build Derby for the first time. For example, when running the tests, I got 
> this exception:
> java.lang.ClassNotFoundException: org.apache.derbyTesting.junit.EnvTest
> but that class was there, the file was there, everything was correct. 
> Googling for the error didn't turn anything up, either. It took me a while to 
> believe that build.xml just wouldn't try to setup a classpath for the tests.

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