--- /dev/null
+use strict;
+use warnings FATAL => 'all';
+
+use utf8;
+use open qw(:std :utf8);
+
+use Test::More;
+use if $ENV{AUTHOR_TESTING}, 'Test::Warnings';
+
+use MooseX::Types::Common::String -all;
+
+ok( is_UpperCaseStr('CAFÉ'), q[CAFÉ is uppercase] );
+ok( !is_UpperCaseStr('CAFé'), q[CAFé is not (entirely) uppercase] );
+
+ok( !is_UpperCaseStr('ŐħĤăĩ'), q[ŐħĤăĩ not entirely uppercase] );
+ok( !is_LowerCaseStr('ŐħĤăĩ'), q[ŐħĤăĩ not entirely lowercase] );
+
+ok( is_LowerCaseStr('café'), q[café is lowercase] );
+ok( !is_LowerCaseStr('cafÉ'), q[cafÉ is not (entirely) lowercase] );
+
+ok( is_UpperCaseSimpleStr('CAFÉ'), q[CAFÉ is uppercase] );
+ok( !is_UpperCaseSimpleStr('CAFé'), q[CAFé is not (entirely) uppercase] );
+
+ok( is_LowerCaseSimpleStr('café'), q[café is lowercase] );
+ok( !is_LowerCaseSimpleStr('cafÉ'), q[cafÉ is not (entirely) lowercase] );
+
+done_testing;