Adjust test after property type loading changes

Class loading is no longer relevant here, so just test general
behavior.

Author: nikic

Zend/tests/type_declarations/union_types/class_loading.phpt

@@ -0,0 +1,71 @@
+--TEST--
+Union types with multiple classes
+--FILE--
+<?php
+
+class Test {
+    public X|Y|Z|int $prop;
+    public function method(X|Y|Z|int $arg): X|Y|Z|int {
+        return $arg;
+    }
+}
+
+// Check that nothing here triggers autoloading.
+spl_autoload_register(function($class) {
+    echo "Loading $class\n";
+});
+
+$test = new Test;
+
+$test->prop = 42; 
+var_dump($test->prop);
+var_dump($test->method(42));
+
+$test->prop = "42";
+var_dump($test->prop);
+var_dump($test->method("42"));
+
+try {
+    $test->prop = new stdClass;
+} catch (TypeError $e) {
+    echo $e->getMessage(), "\n";
+}
+
+try {
+    $test->method(new stdClass);
+} catch (TypeError $e) {
+    echo $e->getMessage(), "\n";
+}
+
+if (true) {
+    class X {}
+}
+
+$test->prop = new X;
+var_dump($test->prop);
+var_dump($test->method(new X));
+
+if (true) {
+    class Z {}
+}
+
+$test->prop = new Z;
+var_dump($test->prop);
+var_dump($test->method(new Z));
+
+?>
+--EXPECTF--
+int(42)
+int(42)
+int(42)
+int(42)
+Cannot assign stdClass to property Test::$prop of type X|Y|Z|int
+Argument 1 passed to Test::method() must be of type X|Y|Z|int, instance of stdClass given, called in %s on line %d
+object(X)#4 (0) {
+}
+object(X)#6 (0) {
+}
+object(Z)#6 (0) {
+}
+object(Z)#4 (0) {
+}