rewrite dash-p.t to use Test::Util

hangs on MoarVM due to RT #121720

S19-command-line-options/03-dash-p.t

@@ -2,6 +2,11 @@ use v6;
 
 use Test;
 
+use lib 't/spec/packages';
+use Test::Util;
+
+plan 2;
+
 =begin pod
 
 Test C<-p> implementation
@@ -18,44 +23,22 @@ switch, and wraps the whole script in
 
 # L<S19/Reference/"Act like sed.">
 
-my @examples = (
-  '-p',
-  '-p "-e1;"',
-  '-pe ";"',
-  '-pe ""',
-  '-p "-e1;" "-e1;"',
-  '"-e1;" -p "-e1;"',
+is_run(
+    '1',      # program
+    "foo\n",  # input
+    {
+        out => "foo\n",   # expected
+    },
+    '-p -e 1 works like cat',
+    :compiler-args['-p'],
 );
 
-plan +@examples;
-
-diag "Running under $*OS";
-
-my ($redir_in,$redir_out) = ("<", ">");
-
-my $str = "
-foo
-bar
-";
-
-sub nonce () { return (".{$*PID}." ~ (1..1000).pick) }
-my ($in_fn, $out_fn) = <temp-ex-input temp-ext-output> >>~>> nonce;
-my $h = open("$in_fn", :w);
-$h.print($str);
-$h.close();
-
-for @examples -> $ex {
-  my $command = "$*EXECUTABLE_NAME $ex $redir_in $in_fn $redir_out $out_fn";
-  diag $command;
-  run $command;
-
-  my $expected = $str;
-  my $got      = slurp $out_fn;
-  unlink $out_fn;
-
-  is $got, $expected, "$ex works like cat";
-}
-
-unlink $in_fn;
-
-# vim: ft=perl6
+is_run(
+    's:g/o/a/',     # program
+    "foo\nbar\n",   # input
+    {
+        out => "faa\nbar\n",
+    },
+    '-p works in combination with s:g///',
+    :compiler-args['-p'],
+);