Been a long day with 'real life' issues I've been trying to use Perl to help me pretend they didn't happen... here's a base test I was thinking.

#!perl -T

use Test::More tests => 9;
use File::Copy qw(copy);
use Tie::File;

my $f = 't/sample.data';
my $wf = 't/write_sample.data';

copy($f, $wf);

tie my @wfh, 'Tie::File', $wf;

for (@wfh){
    if (/sub seven/){
        $_ =~ s/seven/xxxxx/;
    }
}

untie @wfh;

#1
eval {
    open my $wfh, '<', $wf
      or die "Can't open test written file $wf: $!";
};
ok (! $@, "copy of test sample file ok" );

open my $wfh, '<', $wf or die $!;

#2
eval {
    open my $fh, '<', $f
      or die "Can't open original test file $f: $!";
};
ok (! $@, "can open orig test file after tie/untie/copy" );

my @wf = <$wfh>;
my @f = <$fh>;

my $count = scalar @f;
my @changes;

#3
for (0..$count){
    if ($wf[$_] and $wf[$_] ne $f[$_]){
        push @changes, $wf[$_];
    }
}
is ( scalar(@changes), 1, "search/replace does the right thing, in the
+ right spot" );

#4
eval { close $fh; };
ok (! $@, "no problem closing the original test read file" );
close $fh;

#5
eval { close $wfh; };
ok (! $@, "no problem closing the test write file" );
close $wfh;

#6
eval { unlink $wf };
ok (! $@, "no problem deleting the test write file" );

#7
eval { open my $wfh, '<', $wf or die "Can't open $wfh: $!"; };
ok ($@, "after unlink of test write file, it can't be opened" );

#8
is (@changes, 1, "search_replace on one line replaces only one line" )
+;
[download]

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