If you run the unit tests on JDK7 the following failure occurs:

    [junit] Testsuite: javafx.stage.PopupTest
    [junit] Tests run: 15, Failures: 1, Errors: 0, Time elapsed: 0.234 sec
    [junit]
    [junit] Testcase: testShowLocation(javafx.stage.PopupTest): FAILED
    [junit] expected:<20.0> but was:<200.0>
    [junit] junit.framework.AssertionFailedError: expected:<20.0> but was:<200.0>
    [junit] at javafx.stage.PopupTest.testShowLocation(PopupTest.java:108)
    [junit]
    [junit]
    [junit] Test javafx.stage.PopupTest FAILED