The following two unit tests in javafx.base are completely commented out (including the class declaration, which makes them malformed).

modules/javafx.base/src/test/java/test/javafx/beans/property/PropertiesTest.java
modules/javafx.base/src/test/java/test/javafx/beans/property/adapter/ReadOnlyJavaBeanPropertyBuilder_General_Test.java

They should be cleaned up at some point by removing the unused files.