-is_deeply( [ $o->sinter( 'test-set1', 'test-set2' ) ], [ 'baz', 'foo' ], 'siter' );
+my $inter = [ 'baz', 'foo' ];
+
+is_deeply( [ $o->sinter( 'test-set1', 'test-set2' ) ], $inter, 'siter' );
+
+ok( $o->sinterstore( 'test-set-inter', 'test-set1', 'test-set2' ), 'sinterstore' );
+
+cmp_ok( $o->scard( 'test-set-inter' ), '==', $#$inter + 1, 'cardinality of intersection' );