[jfx18] RFR: 8280275: JUnit5 tests using Assumptions API fail to compile in some cases

[Kevin Rushforth]

On Wed, 19 Jan 2022 15:18:48 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Fixed a test dependency issue in `build.gradle` that causes a compilation failure when running `gradle test` if the `Assumptions` API from JUnit5 is used. I added a test that fails to compile without the build fix and passes with the fix.
> 
> This was first discovered when testing the patch for PR #715, which fails to compile on my local macOS system. After applying this fix, I can compile and run the test from that PR.

NOTE: this test fix is targeted to `jfx18`.

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PR: https://git.openjdk.java.net/jfx/pull/720