* testsuite/arcfour-test.c (test_main): Use test_cipher_stream.

* testsuite/testutils.c (test_cipher_stream): New function, that
tries dividing the input into varying size blocks before
processing.

Rev: src/nettle/testsuite/arcfour-test.c:1.3
Rev: src/nettle/testsuite/testutils.c:1.23
Rev: src/nettle/testsuite/testutils.h:1.19