Is there some way I can prove (i.e., write a test case to show) that the list returned by `listOf(.....

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[kenkousen]

Is there some way I can prove (i.e., write a test case to show) that the list returned by listOf(...) is immutable (er, unmodifiable)? I tried to use reflection to list the functions on the resulting object, but all the add, remove, etc, methods are still there.

[karelpeeters]

As per the list interface there is no way to test this.

[karelpeeters]

You can try calling all of the modifying functions and see if any of them throw.

[karelpeeters]

(no that you need to call all of them because implementations of List can for example allow set(index, value) while throwing for add(value). (see Arrays.asList)

[dewildte]

Hmm, can you replace with a wrapper class that internally uses an immutable list?

[dewildte]

Seems like overkill but if you gotta be sure...