[\@test_array, '[-3:-1]', 'ef'],
    [\@test_array, '[-3:-3]', ''],
    [\@test_array, '[3:-1]',  'def'],
    [\@test_array, '[:]',  'abcdefg'],

##</code><code>##

1..8
ok 1 - Testing: [:3]
ok 2 - Testing: [:-3]
ok 3 - Testing: [3:]
ok 4 - Testing: [-3:]
ok 5 - Testing: [-3:-1]
ok 6 - Testing: [-3:-3]
ok 7 - Testing: [3:-1]
ok 8 - Testing: [:]