add a convoluted test

Author: withinboredom

Zend/tests/data_class_006.phpt

@@ -0,0 +1,42 @@
+--TEST--
+A convoluted path
+--FILE--
+<?php
+
+data class Length {
+    public function __construct(public float $length) {}
+}
+
+data class Point {
+    public int $x;
+    private Length $l;
+    public function __construct(int $x, public int $y) {
+        $previous = $this;
+        $this->x = $x;
+        $this->l = new Length($x + $y);
+        echo "$previous === $this\n";
+    }
+
+    public function addNoisily(Point $other): Point {
+        echo "Adding $this and $other\n";
+        $previous = $this;
+        $this->x += $other->x;
+        $this->y += $other->y;
+        $this->l = new Length($this->x + $this->y);
+        echo "$previous !== $this\n";
+        return $this;
+    }
+
+    public function __toString(): string {
+        return "({$this->x},{$this->y}|{$this->l->length})";
+    }
+}
+
+$p1 = new Point(1, 2);
+$p2 = $p1->addNoisily($p1);
+
+?>
+--EXPECT--
+(1,2|3) === (1,2|3)
+Adding (1,2|3) and (1,2|3)
+(1,2|3) !== (2,4|6)