Add a test for PerlIO::Via.

p4raw-id: //depot/perl@11582

2 files changed, 40 insertions, 2 deletions

diff --git a/ext/PerlIO/Via/Via.pm b/ext/PerlIO/Via/Via.pm
index 1f5dedd762..2c7328942a 100644
--- a/ext/PerlIO/Via/Via.pm
+++ b/ext/PerlIO/Via/Via.pm
@@ -22,8 +22,13 @@ following methods. In the method descriptions below I<$fh> will be
 a reference to a glob which can be treated as a perl file handle.
 It refers to the layer below. I<$fh> is not passed if the layer
 is at the bottom of the stack, for this reason and to maintain
-some level of "compatibility" with TIEHANDLE classes it is passed
-last.
+some level of "compatibility" with TIEHANDLE classes it is passed last.
+
+As an example, in Perl release 5.8.0 the MIME::QuotedPrint module
+defines the required TIEHANDLE methods so that you can say
+
+	use MIME::QuotedPrint;
+	open(my $fh, ">Via(MIME::QuotedPrint)", "qp");
 
 =over 4
 
diff --git a/ext/PerlIO/t/via.t b/ext/PerlIO/t/via.t
new file mode 100644
index 0000000000..a2201e08c6
--- /dev/null
+++ b/ext/PerlIO/t/via.t
@@ -0,0 +1,33 @@
+#!./perl
+
+BEGIN {
+    chdir 't' if -d 't';
+    @INC = '../lib';
+    unless (find PerlIO::Layer 'perlio') {
+	print "1..0 # Skip: not perlio\n";
+	exit 0;
+    }
+}
+
+my $tmp = "via$$";
+
+print "1..3\n";
+
+$a = join("", map { chr } 0..255) x 10;
+
+use MIME::QuotedPrint;
+open(my $fh,">Via(MIME::QuotedPrint)", $tmp);
+print $fh $a;
+close($fh);
+print "ok 1\n";
+
+open(my $fh,"<Via(MIME::QuotedPrint)", $tmp);
+{ local $/; $b = <$fh> }
+close($fh);
+print "ok 2\n";
+
+print "ok 3\n" if $a eq $b;
+
+END {
+    1 while unlink $tmp;
+}