provides deep comparisons of any data structures, including hashes. It is also capable of very advanced testing - what regular expressions do for strings, Test::Deep does for data structures.
if (eq_deeply($hash1, $hash2))
print "they match"
The fancy stuff comes in when you do something like
$animals = set("cat", "dog");
$people = set("john", "mary");
$a_p = set($animals, $people);
print eq_deeply($structure, $a_p);
Ths is an example of testing set equality. It tests that $structure is an array with 2 elemenents (in any order) where each of those elements is an array with 2 elements, one containiing "cat" and "dog" (in any order) the other containing "john" and "mary" (in any order)
When used as part of the Test::Builder framework it gives diagnostics on where the structures differed.
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