is_deeply()

• Compares data structures (arrays & hashes)
• Arrays & Hashes
• Hashes of Arrays and Arrays of Hashes ....
• Use a reference to the data structure

is_deeply(  $got,  $expected, $test_name );
is_deeply( \@got, \@expected, $test_name );
is_deeply( \%got, \%expected, $test_name );

• must test like for like