Add test for Pack200.

Default implementation was removed and no alternative is
available. So, newPacker/newUnpacker methods throw NPE.

Bug: 182165515
Test: atest libcore.java.util.jar.Pack200Test

(cherry picked from commit af8e782ec4a78c32c938e632c356e698a4b5eb10)

Change-Id: If68e0e5537b9416dea9b08f4ece5511c4e8f9aa0
Merged-In: If68e0e5537b9416dea9b08f4ece5511c4e8f9aa0
1 file changed