tests: Add test for confirming that target getter is called to determine whether to call clone

Test written by Adrian17

Author: Lord-McSweeney

tests/tests/swfs/avm2/event_target_getter/Test.as

@@ -0,0 +1,63 @@
+// compiled with mxmlc
+
+import flash.events.Event;
+import flash.display.DisplayObject;
+
+package {
+    import flash.display.MovieClip;
+    import flash.display.DisplayObject;
+    import flash.events.Event;
+
+    public class Test extends MovieClip {
+        public function Test(){
+            var d = new MovieClip();
+            trace("// testing trivial getter")
+            var e1 = new E1("e1", d);
+            d.dispatchEvent(e1);
+
+            trace("// testing 1-cycle-delayed getter")
+            var e2 = new E2("e2", d);
+            d.dispatchEvent(e2);
+        }
+
+    }
+}
+
+
+class E1 extends Event {
+    private var dobj: DisplayObject;
+    public function E1(type, dobj){
+        super(type, false, false);
+        this.dobj = dobj;
+    }
+    override public function get target(): Object {
+        trace("in get target()");
+        return this.dobj;
+    }
+    override public function clone(): Event {
+        trace("in clone()");
+        return new E1(this.type, this.dobj);
+    }
+}
+
+class E2 extends Event {
+    private var ready: Boolean;
+    private var dobj: DisplayObject;
+    public function E2(type, d){
+        super(type, false, false);
+        this.ready = false;
+        this.dobj = dobj;
+    }
+    override public function get target(): Object {
+        trace("in get target()");
+        if (this.ready) {
+            return this.dobj;
+        }
+        this.ready = true;
+        return null;
+    }
+    override public function clone(): Event {
+        trace("in clone()");
+        return new E2(this.type, this.dobj);
+    }
+}

tests/tests/swfs/avm2/event_target_getter/output.txt

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+// testing trivial getter
+in get target()
+in clone()
+// testing 1-cycle-delayed getter
+in get target()

tests/tests/swfs/avm2/event_target_getter/test.swf

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+# The test observes dispatcher accessing `.target` to check if event is being re-dispatched.
+num_frames = 1