Let's try this then:
--- MANIFEST~ Thu May 9 19:04:21 2002
+++ MANIFEST Thu May 9 19:06:06 2002
@@ -88,6 +88,7 @@
ext/B/Makefile.PL Compiler backend makefile writer
ext/B/NOTES Compiler backend notes
ext/B/O.pm Compiler front-end module (-MO=...)
+ext/B/t/o.t See if O works
ext/B/ramblings/cc.notes Compiler ramblings: notes on CC backend
ext/B/ramblings/curcop.runtime Compiler ramblings: notes on curcop use
ext/B/ramblings/flip-flop Compiler ramblings: notes on flip-flop
--- /dev/null Thu Aug 30 02:54:37 2001
+++ ext/B/t/o.t Thu May 9 21:40:17 2002
@@ -0,0 +1,64 @@
+#!./perl -w
+
+use strict;
+use File::Spec;
+
+BEGIN {
+ chdir 't' if -d 't';
+ @INC = ('../lib', 'lib', '.');
+ require 'test.pl';
+}
+
+my $file = File::Spec->catfile( 'lib', 'B', 'success.pm' );
+local *OUT;
+open(OUT, '>', $file) or skip_all( 'Cannot write fake backend module');
+print OUT while <DATA>;
+close *OUT;
+
+plan( 9 );
+
+# use() makes it difficult to avoid O::import()
+require_ok( 'O' );
+
+my @args = ('-Ilib', '-MO=success,foo,bar', '-e', '1' );
+my @lines = get_lines( @args );
+
+is( $lines[0], '-e syntax OK', 'O.pm should not munge perl output without
-qq');
+is( $lines[1], 'Compiling!', 'Output should not be saved without -q switch'
);
+is( $lines[2], '(foo) <bar>', 'O.pm should call backend compile() method' );
+is( $lines[3], '[]', 'Nothing should be in $O::BEGIN_output without -q' );
+
+$args[1] = '-MO=-q,success,foo,bar';
+@lines = get_lines( @args );
+isnt( $lines[1], 'Compiling!', 'Output should not be printed with -q switch'
);
+is( $lines[2], "[Compiling!", '... but should be in $O::BEGIN_output' );
+
+$args[1] = '-MO=-qq,success,foo,bar';
+@lines = get_lines( @args );
+is( scalar @lines, 3, '-qq should suppress even the syntax OK message' );
+
+$args[1] = '-MO=success,fail';
+@lines = get_lines( @args );
+like( $lines[0], qr/fail at .eval/,
+ 'O.pm should die if backend compile() does not return a subref' );
+
+sub get_lines {
+ split(/[\r\n]+/, runperl( args => [ @_ ], stderr => 1 ));
+}
+
+END {
+ 1 while unlink('lib/B/success.pm');
+}
+
+__END__
+package B::success;
+
+print "Compiling!\n";
+
+sub compile {
+ return 'fail' if ($_[0] eq 'fail');
+ print "($_[0]) <$_[1]>\n";
+ return sub { print "[$O::BEGIN_output]\n" };
+}
+
+1;
