added tests to eventlistener

Author: cosmic-pixel-painter

unittests/files/eventlistener.ts

@@ -1,9 +1,54 @@
-document.addEventListener("arbitrary_invalid_event", (ev) => {
-  return ev.returnValue;
-});
-
 document.addEventListener("arbitrary_invalid_event", {
   handleEvent(ev)  {
     return ev.returnValue;
+  },
+});
+const divElement: HTMLElement = document.createElement("div");
+
+/**
+ * addEventListener works with a single event arg, Event
+ */
+divElement.addEventListener(
+  "click",
+  (event: Event) => {
+    if (event) {
+      return;
+    }
+  },
+  false,
+);
+/**
+ * HTMLElement addEventListener works with a custom string and single event arg, Event
+ */
+divElement.addEventListener("beep", (event: Event) => {
+  if (event) {
+    return;
+  }
+});
+
+const svgElement = document.createElementNS(
+  "http://www.w3.org/2000/svg",
+  "svg",
+);
+
+/**
+ * SVGElement addEventListener works with a single event arg, Event
+ */
+svgElement.addEventListener(
+  "click",
+  (event: Event) => {
+    if (event) {
+      return;
+    }
+  },
+  false,
+);
+
+/**
+ * SVGElement addEventListener works with a custom string and single event arg, Event
+ */
+svgElement.addEventListener("beep", (event: Event) => {
+  if (event) {
+    return;
   }
 });