1 files changed, 244 insertions, 0 deletions
diff --git a/op_crates/web/event_target_test.js b/op_crates/web/event_target_test.js
new file mode 100644
index 000000000..5e86c6efb
--- /dev/null
+++ b/op_crates/web/event_target_test.js
@@ -0,0 +1,244 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+function assert(cond) {
+  if (!cond) {
+    throw Error("assert");
+  }
+}
+
+function addEventListenerTest() {
+  const document = new EventTarget();
+
+  assert(document.addEventListener("x", null, false) === undefined);
+  assert(document.addEventListener("x", null, true) === undefined);
+  assert(document.addEventListener("x", null) === undefined);
+}
+
+function constructedEventTargetCanBeUsedAsExpected() {
+  const target = new EventTarget();
+  const event = new Event("foo", { bubbles: true, cancelable: false });
+  let callCount = 0;
+
+  const listener = (e) => {
+    assert(e === event);
+    ++callCount;
+  };
+
+  target.addEventListener("foo", listener);
+
+  target.dispatchEvent(event);
+  assert(callCount === 1);
+
+  target.dispatchEvent(event);
+  assert(callCount === 2);
+
+  target.removeEventListener("foo", listener);
+  target.dispatchEvent(event);
+  assert(callCount === 2);
+}
+
+function anEventTargetCanBeSubclassed() {
+  class NicerEventTarget extends EventTarget {
+    on(
+      type,
+      callback,
+      options,
+    ) {
+      this.addEventListener(type, callback, options);
+    }
+
+    off(
+      type,
+      callback,
+      options,
+    ) {
+      this.removeEventListener(type, callback, options);
+    }
+  }
+
+  const target = new NicerEventTarget();
+  new Event("foo", { bubbles: true, cancelable: false });
+  let callCount = 0;
+
+  const listener = () => {
+    ++callCount;
+  };
+
+  target.on("foo", listener);
+  assert(callCount === 0);
+
+  target.off("foo", listener);
+  assert(callCount === 0);
+}
+
+function removingNullEventListenerShouldSucceed() {
+  const document = new EventTarget();
+  assert(document.removeEventListener("x", null, false) === undefined);
+  assert(document.removeEventListener("x", null, true) === undefined);
+  assert(document.removeEventListener("x", null) === undefined);
+}
+
+function constructedEventTargetUseObjectPrototype() {
+  const target = new EventTarget();
+  const event = new Event("toString", { bubbles: true, cancelable: false });
+  let callCount = 0;
+
+  const listener = (e) => {
+    assert(e === event);
+    ++callCount;
+  };
+
+  target.addEventListener("toString", listener);
+
+  target.dispatchEvent(event);
+  assert(callCount === 1);
+
+  target.dispatchEvent(event);
+  assert(callCount === 2);
+
+  target.removeEventListener("toString", listener);
+  target.dispatchEvent(event);
+  assert(callCount === 2);
+}
+
+function toStringShouldBeWebCompatible() {
+  const target = new EventTarget();
+  assert(target.toString() === "[object EventTarget]");
+}
+
+function dispatchEventShouldNotThrowError() {
+  let hasThrown = false;
+
+  try {
+    const target = new EventTarget();
+    const event = new Event("hasOwnProperty", {
+      bubbles: true,
+      cancelable: false,
+    });
+    const listener = () => {};
+    target.addEventListener("hasOwnProperty", listener);
+    target.dispatchEvent(event);
+  } catch {
+    hasThrown = true;
+  }
+
+  assert(hasThrown === false);
+}
+
+function eventTargetThisShouldDefaultToWindow() {
+  const {
+    addEventListener,
+    dispatchEvent,
+    removeEventListener,
+  } = EventTarget.prototype;
+  let n = 1;
+  const event = new Event("hello");
+  const listener = () => {
+    n = 2;
+  };
+
+  addEventListener("hello", listener);
+  globalThis.dispatchEvent(event);
+  assert(n === 2);
+  n = 1;
+  removeEventListener("hello", listener);
+  globalThis.dispatchEvent(event);
+  assert(n === 1);
+
+  globalThis.addEventListener("hello", listener);
+  dispatchEvent(event);
+  assert(n === 2);
+  n = 1;
+  globalThis.removeEventListener("hello", listener);
+  dispatchEvent(event);
+  assert(n === 1);
+}
+
+function eventTargetShouldAcceptEventListenerObject() {
+  const target = new EventTarget();
+  const event = new Event("foo", { bubbles: true, cancelable: false });
+  let callCount = 0;
+
+  const listener = {
+    handleEvent(e) {
+      assert(e === event);
+      ++callCount;
+    },
+  };
+
+  target.addEventListener("foo", listener);
+
+  target.dispatchEvent(event);
+  assert(callCount === 1);
+
+  target.dispatchEvent(event);
+  assert(callCount === 2);
+
+  target.removeEventListener("foo", listener);
+  target.dispatchEvent(event);
+  assert(callCount === 2);
+}
+
+function eventTargetShouldAcceptAsyncFunction() {
+  const target = new EventTarget();
+  const event = new Event("foo", { bubbles: true, cancelable: false });
+  let callCount = 0;
+
+  const listener = (e) => {
+    assert(e === event);
+    ++callCount;
+  };
+
+  target.addEventListener("foo", listener);
+
+  target.dispatchEvent(event);
+  assert(callCount === 1);
+
+  target.dispatchEvent(event);
+  assert(callCount === 2);
+
+  target.removeEventListener("foo", listener);
+  target.dispatchEvent(event);
+  assert(callCount === 2);
+}
+
+function eventTargetShouldAcceptAsyncFunctionForEventListenerObject() {
+  const target = new EventTarget();
+  const event = new Event("foo", { bubbles: true, cancelable: false });
+  let callCount = 0;
+
+  const listener = {
+    handleEvent(e) {
+      assert(e === event);
+      ++callCount;
+    },
+  };
+
+  target.addEventListener("foo", listener);
+
+  target.dispatchEvent(event);
+  assert(callCount === 1);
+
+  target.dispatchEvent(event);
+  assert(callCount === 2);
+
+  target.removeEventListener("foo", listener);
+  target.dispatchEvent(event);
+  assert(callCount === 2);
+}
+
+function main() {
+  globalThis.__bootstrap.eventTarget.setEventTargetData(globalThis);
+  addEventListenerTest();
+  constructedEventTargetCanBeUsedAsExpected();
+  anEventTargetCanBeSubclassed();
+  removingNullEventListenerShouldSucceed();
+  constructedEventTargetUseObjectPrototype();
+  toStringShouldBeWebCompatible();
+  dispatchEventShouldNotThrowError();
+  eventTargetThisShouldDefaultToWindow();
+  eventTargetShouldAcceptEventListenerObject();
+  eventTargetShouldAcceptAsyncFunction();
+  eventTargetShouldAcceptAsyncFunctionForEventListenerObject();
+}
+
+main();