EmptyPath.toString() returns a String, thus we get the following warning from JUnit while executing it:

(1) [WARNING] @Test method 'public java.lang.String EmptyPath.toString()' must not return a value. It will not be executed.
    Source: MethodSource [className = 'EmptyPath', methodName = 'toString', methodParameterTypes = '']
            at EmptyPath.toString(SourceFile:0)