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$got = 
    [ { key_1 => "A", key_2 => "CC"}
...
    [ { key_1 => "B", key_2 => "CC"}
    , { key_1 => "A", key_2 => "CC"}
    ]

return is deeply ( $got
                   ? [ sort {$a->{key_1} cmp $b->{key_1}}
...
                              $expected ]
                   : []
                 , "Test array of hashes"

$got = 
    [ { key_3 => "A", key_2 => "CC"}
...
    [ { key_3 => "B", key_2 => "CC"}
    , { key_3 => "A", key_2 => "CC"}
    ]

sort {$a->{key_1} cmp $b->{key_1}}

return = cmp_deeply ( $got
                      ? [ $got ]
...
                            ? $expected
                            : () )
                    );