OK, I think I know what you're asking. You want the output to go into an array as well as the file. If that's right, then this will do what you want.

#!perl.exe -w
use strict;

my $filename='e:\test.out.txt';
my $output='e:\out.txt';
sub body {
  if (-r $filename) {
    open(FILE,"<$filename") || die "$filename: $!\n";

    my (@output, $section);

    while(<FILE>) {
      chomp;

      if (/Datasource:/) { push @output, "\n$_"; }

      if (/Passed:/) { 
        $section="passed"; 
        next; 
      } elsif (/Failed:/) { 
        $section="failed"; 
        push @output, "\n$_"; 
        next;
      } elsif (/Exception:/) { 
        $section="except";
        push @output, "\n$_"; 
        next; 
      }

      if ($section ne "passed") {
        if (/(test\.)|(Summary:)/) { 
          push @output, "\n$_"; 
        }
      }
    }
    close(FILE);
  
    open(OUTPUT, "> $output") || die "$output: $!\n";
    print OUTPUT @output;
    close(OUTPUT);
  } else {
    print("cant read file $filename\n");
  }
}
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