1 files changed, 83 insertions, 0 deletions
diff --git a/t/09warnings.t b/t/09warnings.t
new file mode 100644
index 0000000..72d40f3
--- /dev/null
+++ b/t/09warnings.t
@@ -0,0 +1,83 @@
+=pod
+
+=encoding utf-8
+
+=head1 PURPOSE
+
+Test sub redefinition warnings/errors.
+
+=head1 AUTHOR
+
+Toby Inkster E<lt>tobyink@cpan.orgE<gt>.
+
+=head1 COPYRIGHT AND LICENCE
+
+This software is copyright (c) 2014 by Toby Inkster.
+
+This is free software; you can redistribute it and/or modify it under
+the same terms as the Perl 5 programming language system itself.
+
+
+=cut
+
+use strict;
+use warnings;
+use Test::More;
+
+BEGIN {
+	eval "use Test::Fatal; use Test::Warnings qw(warning :no_end_test); 1"
+		or plan skip_all => "test requires Test::Warnings and Test::Fatal";
+	
+	plan tests => 4;
+};
+
+BEGIN {
+	package Local::Exporter;
+	use Exporter::Shiny qw(foo bar);
+	sub foo { 666 }
+	sub bar { 999 }
+};
+
+like(
+	warning { eval q{
+		package Local::Test1;
+		sub foo { 42 }
+		use Local::Exporter -all;
+		1;
+	} },
+	qr/^Overwriting existing sub 'Local::Test1::foo' with sub 'foo' exported by Local::Exporter/,
+	'warning about overwriting sub',
+);
+
+like(
+	exception { eval q{
+		package Local::Test2;
+		sub foo { 42 }
+		use Local::Exporter { replace => 'die' }, -all;
+		1;
+	} or die $@ },
+	qr/^Refusing to overwrite existing sub 'Local::Test2::foo' with sub 'foo' exported by Local::Exporter/,
+	'... which can be fatalized',
+);
+
+is_deeply(
+	warning { eval q{
+		package Local::Test3;
+		sub foo { 42 }
+		use Local::Exporter { replace => 'die' }, -all;
+		1;
+	} },
+	[],
+	'... or suppressed',
+);
+
+is_deeply(
+	warning { eval q{
+		package Local::Test4;
+		use Local::Exporter -all;
+		use Local::Exporter qw(foo);
+		1;
+	} },
+	[],
+	'but importing the exact same sub twice is OK',
+);