Use strict type hinting in all tests.

tests/unicode_characters.aer

@@ -1,6 +1,6 @@
 class Unicode {
 
-	public function unicon($str, $to_uni = true) {
+	public function unicon(string $str, bool $to_uni = true) {
 		$cp = array('А' => 'А', 'а' => 'а',
 			"Б" => "Б", "б" => "б",
 			"В" => "В", "в" => "в",