RFR: 8217472: Add attenuation for PointLight [v15]

[Kevin Rushforth]

On Fri, 9 Oct 2020 14:55:36 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> tests/system/src/test/java/test/javafx/scene/lighting3D/PointLightAttenuationTest.java line 135:
>> 
>>> 133:     @AfterClass
>>> 134:     public static void teardown() {
>>> 135:         Platform.runLater(() -> {
>> 
>> I forgot to mention that the `@AfterClass` method is still run even if the call to `assumeTrue` in the `@BeforeClass`
>> method causes the test to be skipped. You will need to repeat the check (or set a flag in `initFX` and check that flag)
>> here and skip the cleanup if the initialization was skipped (using an `if` check, not repeating the `assumeTrue`).
>> Otherwise the exception that is thrown here will cause the test to fail.  You can test this by forcing the SW pipeline.
>> I did it like this:  _JAVA_OPTIONS="-Dprism.order=sw" gradle --info -PFULL_TEST=true :systemTests:test --tests
>> PointLightAttenuationTest
>
> The test fails even with this addition. I found that I need to use `@Before` to run the check, and then I don't need
> the ones in `@BeforeClass` and `@AfterClass`, should I keep those?

Putting the `assumeTrue` in an `@Before` method seems best. I checked and it's what all of the other 3D tests do. There
is no need to test for this in the `@BeforeClass` and `@AferClass` methods.

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PR: https://git.openjdk.java.net/jfx/pull/43