add more tests

Author: withinboredom

Zend/tests/data_class_010.phpt

@@ -0,0 +1,18 @@
+--TEST--
+Serialization works
+--FILE--
+<?php
+
+data class Point {
+    public function __construct(public int $x, public int $y) {}
+}
+
+$p = new Point(1, 2);
+$s = serialize($p);
+var_dump($s);
+$p2 = unserialize($s);
+var_dump($p2 === $p);
+?>
+--EXPECT--
+string(40) "O:5:"Point":2:{s:1:"x";i:1;s:1:"y";i:2;}"
+bool(true)

Zend/tests/data_class_011.phpt

@@ -0,0 +1,37 @@
+--TEST--
+Other features work with data classes
+--FILE--
+<?php
+
+interface Point {
+  public function add(Point $point): Point;
+  public float $length { get; }
+}
+
+trait PythagoreanTheorem {
+    public readonly float $length;
+
+    public function memoizeLength(): void {
+        $this->length = sqrt($this->x ** 2 + $this->y ** 2);
+    }
+}
+
+final readonly data class Point2D implements Point {
+    use PythagoreanTheorem; // contains implementation of $length
+
+    public function __construct(public int $x, public int $y) {
+        $this->memoizeLength(); // from the trait
+    }
+
+    public function add(Point $point): Point {
+        return new static($this->x + $point->x, $this->y + $point->y);
+    }
+}
+
+$p1 = new Point2D(1, 1);
+$p2 = new Point2D(2, 2);
+$p3 = $p1->add($p2);
+echo $p3->length, "\n";
+?>
+--EXPECT--
+6