[perl #49704] [CAGE] t/op/string.t: Determine whether test can be divided into smaller files

[James Keenan via RT]

Examination of t/op/*.t files with > 1000 lines suggests that the files
are long because the tests are largely data-driven.  Nonetheless, the
files appear to be conceptually whole.  Hence, there is no compelling
case for subdividing this test file.  I am closing the ticket.