Add invokable test

Author: arnaud-lb

Zend/tests/partial_application/invokable.phpt

@@ -0,0 +1,47 @@
+--TEST--
+Partial application invokable
+--FILE--
+<?php
+
+class C {
+    public function __invoke(int $a, object $b): C {
+        var_dump($a, $b);
+        return $this;
+    }
+}
+
+$c = new C();
+$f = $c(?, ...);
+
+echo (string) new ReflectionFunction($f), "\n";
+
+$f = $c(?, new stdClass);
+
+echo (string) new ReflectionFunction($f), "\n";
+
+$f(1);
+
+?>
+--EXPECTF--
+Partial [ <user, prototype C> public method __invoke ] {
+  @@ %s.php 11 - 11
+
+  - Parameters [2] {
+    Parameter #0 [ <required> int $a ]
+    Parameter #1 [ <required> object $b ]
+  }
+  - Return [ C ]
+}
+
+Partial [ <user, prototype C> public method __invoke ] {
+  @@ %s.php 15 - 15
+
+  - Parameters [1] {
+    Parameter #0 [ <required> int $a ]
+  }
+  - Return [ C ]
+}
+
+int(1)
+object(stdClass)#%d (0) {
+}