1 files changed, 23 insertions, 0 deletions
diff --git a/t/type_constraints/define_type_twice_throws.t b/t/type_constraints/define_type_twice_throws.t
new file mode 100644
index 0000000..a9b9b83
--- /dev/null
+++ b/t/type_constraints/define_type_twice_throws.t
@@ -0,0 +1,23 @@
+use strict;
+use warnings;
+
+use Test::More;
+use Test::Fatal;
+
+use Moose::Util::TypeConstraints;
+
+{
+    package Some::Class;
+    use Moose::Util::TypeConstraints;
+
+    subtype 'MySubType' => as 'Int' => where { 1 };
+}
+
+like( exception {
+    package Some::Other::Class;
+    use Moose::Util::TypeConstraints;
+
+    subtype 'MySubType' => as 'Int' => where { 1 };
+}, qr/cannot be created again/, 'Trying to create same type twice throws' );
+
+done_testing;