The javax/swing/JButton/4796987/bug4796987.java test is designed to be run specifically on Windows XP:

OSVersion.current().equals(OSVersion.WINDOWS_XP)

Windows XP is obsolete for a long time. The test requires visual style that were introduced in Windows XP. At the time time, the test is relevant for any version of Windows after Windows XP. This is especially true now where visual styles are always enabled, the classic theme isn't supported since Windows 8.