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{                                                                     
+           
    "root": {                                  
...
        }
    ]
}

        push @{ $href->{test} }, {
            group  => $group,
            values => [ sort uniq $value, @{ $href->{values} // [] } ]
        };

    my $test_num = 0;
    for my $file ( @test_files ) {
...
            push @{ $href->{ $test_num }{ $group } }, $value;
        }
    }