It occurs from time to time with potentially any test creating a temporary file and running on Windows.

java.io.IOException: Access is denied
at java.io.WinNTFileSystem.createFileExclusively(Native Method)
at java.io.File.createNewFile(File.java:947)
at com.oracle.javafx.authoring.util.IoUtilities.createNewFile(IoUtilities.java:98)
at com.oracle.javafx.authoring.util.IoUtilities.saveUTF8(IoUtilities.java:159)
at com.oracle.javafx.authoring.Project.save(Project.java:1116)
at com.oracle.javafx.authoring.Project.save(Project.java:1087)
at com.oracle.javafx.authoring.test.TestUtils.testWithTestClass(TestUtils.java:955)
at com.oracle.javafx.authoring.persist.ProductionProjectBase.testFxmlProject(ProductionProjectBase.java:520)
at com.oracle.javafx.authoring.persist.FxmlProjectTest.testAllFxmlFiles(FxmlProjectTest.java:252)
at com.oracle.javafx.authoring.test.JavaFxRunner$3.call(JavaFxRunner.java:257)
at com.oracle.javafx.authoring.test.JavaFxRunner$3.call(JavaFxRunner.java:244)
at com.oracle.javafx.authoring.test.JavaFxRunner$7.run(JavaFxRunner.java:398)
at com.sun.javafx.application.PlatformImpl$4.run(PlatformImpl.java:173)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:73)
at java.lang.Thread.run(Thread.java:722)