RFR: JDK-8231605: Improve test helpers

[Alexander Matveev]

Looks good.

On 9/29/2019 1:50 PM, Alexey Semenyuk wrote:
> Please review the jpackage fix for bug [1] at [2].
>
> This is a fix for the JDK-8200758-branch branch of the open sandbox 
> repository (jpackage).
>
> This fix:
>
> - Improve jpackage test helpers.
> - Implement jdk.jpackage.internal.ApplicationLayout class on all 
> platforms.
> - Functionality of all deleted tests moved into the new BasicTest.java 
> based on the new test helper classes.
>
> The long term plan is to refactor existing tests based on the old test 
> helpers using the new testing classes.
> For now it is suggested to implement all new tests with the new test 
> helpers using BasicTest.java as a reference.
>
> BasicTest not in the default but in jdk.jpackage.tests package 
> intentionally. It is not directly executed by jtreg harness, but 
> indirectly through test helper, so jtreg has no issues locating it.
> The reason to keep test classes away from the default package is that 
> NetBeans is very slow on projects with many classes in the default 
> package, so the expectation is that it will work faster of the project 
> with jpackage tests after they get moved out from the default package.
>
> [1] https://bugs.openjdk.java.net/browse/JDK-8231605
>
> [2] http://cr.openjdk.java.net/~asemenyuk/8231605/webrev.00/
>