Add a test for t0m's DEMOLISH bug

diff --git a/t/100_bugs/023_DEMOLISH_fails_without_metaclass.t b/t/100_bugs/023_DEMOLISH_fails_without_metaclass.t
new file mode 100644 (file)
index 0000000..7e9b9b9
--- /dev/null
+++ b/t/100_bugs/023_DEMOLISH_fails_without_metaclass.t
@@ -0,0 +1,34 @@
+use strict;
+use warnings;
+
+use Test::More tests => 2;
+use Test::Exception;
+
+{
+    package MyClass;
+    use Moose;
+
+    sub DEMOLISH { }
+}
+
+my $object = MyClass->new;
+
+# Removing the metaclass simulates the case where the metaclass object
+# goes out of scope _before_ the object itself, which under normal
+# circumstances only happens during global destruction.
+Class::MOP::remove_metaclass_by_name('MyClass');
+
+# The bug happened when DEMOLISHALL called
+# Class::MOP::class_of($object) and did not get a metaclass object
+# back.
+lives_ok { $object->DESTROY }
+'can call DESTROY on an object without a metaclass object in the CMOP cache';
+
+
+MyClass->meta->make_immutable;
+Class::MOP::remove_metaclass_by_name('MyClass');
+
+# The bug didn't manifest for immutable objects, but this test should
+# help us prevent it happening in the future.
+lives_ok { $object->DESTROY }
+'can call DESTROY on an object without a metaclass object in the CMOP cache (immutable version)';