use strict;
use warnings;
-use Test::More tests => 2;
+use Test::More tests => 3;
use Test::Exception;
'Non-ref provided to immutable constructor gives useful error message';
throws_ok { Foo->new(\$scalar) } qr/\QSingle parameters to new() must be a HASH ref/,
'Scalar ref provided to immutable constructor gives useful error message';
+throws_ok { Foo->new(undef) } qr/\QSingle parameters to new() must be a HASH ref/,
+ 'undef provided to immutable constructor gives useful error message';