[perl #118923] [PATCH] Add some edge cases to join.t test

# New Ticket Created by  Victor Efimov 
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Add some edge cases to join.t test

test what join return if called with empty LIST, also
test that it produce warning if separator is unde

http://github.com/vsespb/perl/tree/more_join_tests
git@github.com:vsespb/perl.git branch more_join_tests

• [perl #118923] [PATCH] Add some edge cases to join.t test by Tony Cook via RT
• [perl #118923] [PATCH] Add some edge cases to join.t test by Father Chrysostomos via RT
• [perl #118923] [PATCH] Add some edge cases to join.t test by Tony Cook via RT
• [perl #118923] [PATCH] Add some edge cases to join.t test by Victor Efimov