This test declares a utility method but ignores the args it is given.

    void testGetTask(Iterable<String> options,
                     Iterable<String> classes,
                     Iterable<? extends JavaFileObject> compilationUnits) {
        try {
            task = tool.getTask(null, null, null, null, null, singleton((JavaFileObject)null));
            throw new AssertionError("Error expected");
        } catch (NullPointerException e) {
            System.err.println("Expected error occurred: " + e);
        }
    }