is_deeply()
is_deeply()
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For comparing complex data structures
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Hashes, lists, hash of lists of hashes of lists of scalar references...
my %expect = ( this => 42, that => [qw(1 2 3)] );
my %got = some_function();
is_deeply( \%got, \%expect );
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Will show you where the two structures start to diverge
not ok 1
# Failed test (- at line 2)
# Structures begin differing at:
# $got->{that}[2] = '3'
# $expected->{that}[2] = Does not exist
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In CS this is really a "shallow comparison" and is() is "deep".
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So the name is wrong because Schwern failed CS.
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A stopgap measure
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Currently doesn't handle circular structures (patches welcome)
