RFR: 8264952: [TestBug] Controls unit tests - ControlTest and SpinnerTest fail for non US Locale

[Kevin Rushforth]

On Thu, 22 Apr 2021 10:36:40 GMT, Ajit Ghaisas <aghaisas at openjdk.org> wrote:

> This PR fixes controls unit test failures that are observed with German locale.
> 
> Fix :
> Code added to use US locale while running SpinnerTest and DatePicker test & restore locale to default after these tests are executed.
> 
> test.javafx.scene.control.ControlTest.testRT18097 fails for DatePicker control. Fixing DatePickerTest fixes this. This reveals the fact that our unit tests run in a single VM and any test that changes the Locale setting should restore it to the default at the end.

This looks good. Saving and restoring global state in this manner represents a best practice. Two questions:

1. In the description you said that `test.javafx.scene.control.ControlTest.testRT18097` fails without your fix and passes with this fix. This suggests that something in that test only works with the "out of the box" default Locale. Do you know why?
2. We have one test in `javafx.base` where we set the default Locale. Can you file a follow-on testbug to save and restore the Locale there, too?

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Marked as reviewed by kcr (Lead).

PR: https://git.openjdk.java.net/jfx/pull/476