--- /dev/null
+use strict;
+# This is automatically generated by author/import-moose-test.pl.
+# DO NOT EDIT THIS FILE. ANY CHANGES WILL BE LOST!!!
+use t::lib::MooseCompat;
+use warnings;
+
+use Test::More;
+$TODO = q{Mouse is not yet completed};
+
+use Mouse::Util::TypeConstraints;
+
+
+eval { Mouse::Util::TypeConstraints::create_type_constraint_union() };
+
+like( $@, qr/\QYou must pass in at least 2 type names to make a union/,
+ 'can throw a proper error without Mouse being loaded by the caller' );
+
+done_testing;