RFR: 8296330: Tests: Add layout container snapping tests [v2]

[Marius Hanl]

On Mon, 7 Nov 2022 19:42:01 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> Marius Hanl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8296330: Added javadoc, made delta a constant, reordered working container on top and renamed ContainerInstruction to ContainerCreator
>
> modules/javafx.graphics/src/test/java/test/javafx/scene/layout/SnappingTest.java line 137:
> 
>> 135: 
>> 136:         assertEquals(widthHeight + snappedPaddingX, container.prefWidth(-1), DELTA, className);
>> 137:         assertEquals(widthHeight + snappedPaddingY, container.prefHeight(-1), DELTA, className);
> 
> sorry, should have specified in my previous comment - this constant is typically called EPSILON (a Greek letter denoting a very small number)

While this is correct, the `assertEquals` method in JUnit calls this variable `delta`, so I think both namings are understandable and fine

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PR: https://git.openjdk.org/jfx/pull/936