Add t/lib/Mo and a bunch of tests

t/lib/Mo/object.t

@@ -0,0 +1,18 @@
+#!/usr/bin/perl
+
+BEGIN {
+   die "The PERCONA_TOOLKIT_BRANCH environment variable is not set.\n"
+      unless $ENV{PERCONA_TOOLKIT_BRANCH} && -d $ENV{PERCONA_TOOLKIT_BRANCH};
+   unshift @INC, "$ENV{PERCONA_TOOLKIT_BRANCH}/lib";
+};
+
+use strict;
+use warnings FATAL => 'all';
+use English qw(-no_match_vars);
+use Test::More tests => 2;
+use lib "$ENV{PERCONA_TOOLKIT_BRANCH}/t/lib/Mo";
+
+{ package Clean; use Foo; }
+
+is_deeply([ @Clean::ISA ], [], "Didn't mess with caller's ISA");
+is(Clean->can('has'), undef, "Didn't export anything");