--- /dev/null
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use Test::More tests => 3;
+use Test::Exception;
+
+# This tests the error handling in Mouse::Object only
+
+{
+ package Foo;
+ use Mouse;
+}
+
+throws_ok { Foo->new('bad') } qr/^\QSingle parameters to new() must be a HASH ref/,
+ 'A single non-hashref arg to a constructor throws an error';
+throws_ok { Foo->new(undef) } qr/^\QSingle parameters to new() must be a HASH ref/,
+ 'A single non-hashref arg to a constructor throws an error';
+
+throws_ok { Foo->does() } qr/^\QYou must supply a role name to does()/,
+ 'Cannot call does() without a role name';