1 files changed, 143 insertions, 0 deletions
diff --git a/tests/unit/event_test.ts b/tests/unit/event_test.ts
new file mode 100644
index 000000000..c82873cf6
--- /dev/null
+++ b/tests/unit/event_test.ts
@@ -0,0 +1,143 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+import { assertEquals, assertStringIncludes } from "./test_util.ts";
+
+Deno.test(function eventInitializedWithType() {
+  const type = "click";
+  const event = new Event(type);
+
+  assertEquals(event.isTrusted, false);
+  assertEquals(event.target, null);
+  assertEquals(event.currentTarget, null);
+  assertEquals(event.type, "click");
+  assertEquals(event.bubbles, false);
+  assertEquals(event.cancelable, false);
+});
+
+Deno.test(function eventInitializedWithTypeAndDict() {
+  const init = "submit";
+  const eventInit = { bubbles: true, cancelable: true } as EventInit;
+  const event = new Event(init, eventInit);
+
+  assertEquals(event.isTrusted, false);
+  assertEquals(event.target, null);
+  assertEquals(event.currentTarget, null);
+  assertEquals(event.type, "submit");
+  assertEquals(event.bubbles, true);
+  assertEquals(event.cancelable, true);
+});
+
+Deno.test(function eventComposedPathSuccess() {
+  const type = "click";
+  const event = new Event(type);
+  const composedPath = event.composedPath();
+
+  assertEquals(composedPath, []);
+});
+
+Deno.test(function eventStopPropagationSuccess() {
+  const type = "click";
+  const event = new Event(type);
+
+  assertEquals(event.cancelBubble, false);
+  event.stopPropagation();
+  assertEquals(event.cancelBubble, true);
+});
+
+Deno.test(function eventStopImmediatePropagationSuccess() {
+  const type = "click";
+  const event = new Event(type);
+
+  assertEquals(event.cancelBubble, false);
+  event.stopImmediatePropagation();
+  assertEquals(event.cancelBubble, true);
+});
+
+Deno.test(function eventPreventDefaultSuccess() {
+  const type = "click";
+  const event = new Event(type);
+
+  assertEquals(event.defaultPrevented, false);
+  event.preventDefault();
+  assertEquals(event.defaultPrevented, false);
+
+  const eventInit = { bubbles: true, cancelable: true } as EventInit;
+  const cancelableEvent = new Event(type, eventInit);
+  assertEquals(cancelableEvent.defaultPrevented, false);
+  cancelableEvent.preventDefault();
+  assertEquals(cancelableEvent.defaultPrevented, true);
+});
+
+Deno.test(function eventInitializedWithNonStringType() {
+  // deno-lint-ignore no-explicit-any
+  const type: any = undefined;
+  const event = new Event(type);
+
+  assertEquals(event.isTrusted, false);
+  assertEquals(event.target, null);
+  assertEquals(event.currentTarget, null);
+  assertEquals(event.type, "undefined");
+  assertEquals(event.bubbles, false);
+  assertEquals(event.cancelable, false);
+});
+
+Deno.test(function eventInspectOutput() {
+  // deno-lint-ignore no-explicit-any
+  const cases: Array<[any, (event: any) => string]> = [
+    [
+      new Event("test"),
+      (event: Event) =>
+        `Event {\n  bubbles: false,\n  cancelable: false,\n  composed: false,\n  currentTarget: null,\n  defaultPrevented: false,\n  eventPhase: 0,\n  srcElement: null,\n  target: null,\n  returnValue: true,\n  timeStamp: ${event.timeStamp},\n  type: "test"\n}`,
+    ],
+    [
+      new ErrorEvent("error"),
+      (event: Event) =>
+        `ErrorEvent {\n  bubbles: false,\n  cancelable: false,\n  composed: false,\n  currentTarget: null,\n  defaultPrevented: false,\n  eventPhase: 0,\n  srcElement: null,\n  target: null,\n  returnValue: true,\n  timeStamp: ${event.timeStamp},\n  type: "error",\n  message: "",\n  filename: "",\n  lineno: 0,\n  colno: 0,\n  error: undefined\n}`,
+    ],
+    [
+      new CloseEvent("close"),
+      (event: Event) =>
+        `CloseEvent {\n  bubbles: false,\n  cancelable: false,\n  composed: false,\n  currentTarget: null,\n  defaultPrevented: false,\n  eventPhase: 0,\n  srcElement: null,\n  target: null,\n  returnValue: true,\n  timeStamp: ${event.timeStamp},\n  type: "close",\n  wasClean: false,\n  code: 0,\n  reason: ""\n}`,
+    ],
+    [
+      new CustomEvent("custom"),
+      (event: Event) =>
+        `CustomEvent {\n  bubbles: false,\n  cancelable: false,\n  composed: false,\n  currentTarget: null,\n  defaultPrevented: false,\n  eventPhase: 0,\n  srcElement: null,\n  target: null,\n  returnValue: true,\n  timeStamp: ${event.timeStamp},\n  type: "custom",\n  detail: undefined\n}`,
+    ],
+    [
+      new ProgressEvent("progress"),
+      (event: Event) =>
+        `ProgressEvent {\n  bubbles: false,\n  cancelable: false,\n  composed: false,\n  currentTarget: null,\n  defaultPrevented: false,\n  eventPhase: 0,\n  srcElement: null,\n  target: null,\n  returnValue: true,\n  timeStamp: ${event.timeStamp},\n  type: "progress",\n  lengthComputable: false,\n  loaded: 0,\n  total: 0\n}`,
+    ],
+  ];
+
+  for (const [event, outputProvider] of cases) {
+    assertEquals(Deno.inspect(event), outputProvider(event));
+  }
+});
+
+Deno.test(function inspectEvent() {
+  // has a customInspect implementation that previously would throw on a getter
+  assertEquals(
+    Deno.inspect(Event.prototype),
+    `Event {
+  bubbles: [Getter],
+  cancelable: [Getter],
+  composed: [Getter],
+  currentTarget: [Getter],
+  defaultPrevented: [Getter],
+  eventPhase: [Getter],
+  srcElement: [Getter/Setter],
+  target: [Getter],
+  returnValue: [Getter/Setter],
+  timeStamp: [Getter],
+  type: [Getter]
+}`,
+  );
+
+  // ensure this still works
+  assertStringIncludes(
+    Deno.inspect(new Event("test")),
+    // check a substring because one property is a timestamp
+    `Event {\n  bubbles: false,\n  cancelable: false,`,
+  );
+});