1 files changed, 103 insertions, 0 deletions
diff --git a/browser/base/content/test/fullscreen/FullscreenFrame.sys.mjs b/browser/base/content/test/fullscreen/FullscreenFrame.sys.mjs
new file mode 100644
index 0000000000..9821837b3f
--- /dev/null
+++ b/browser/base/content/test/fullscreen/FullscreenFrame.sys.mjs
@@ -0,0 +1,103 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * test helper JSWindowActors used by the browser_fullscreen_api_fission.js test.
+ */
+
+export class FullscreenFrameChild extends JSWindowActorChild {
+  actorCreated() {
+    this.fullscreen_events = [];
+  }
+
+  changed() {
+    return new Promise(resolve => {
+      this.contentWindow.document.addEventListener(
+        "fullscreenchange",
+        () => resolve(),
+        {
+          once: true,
+        }
+      );
+    });
+  }
+
+  requestFullscreen() {
+    let doc = this.contentWindow.document;
+    let button = doc.createElement("button");
+    doc.body.appendChild(button);
+
+    return new Promise(resolve => {
+      button.onclick = () => {
+        doc.body.requestFullscreen().then(resolve);
+        doc.body.removeChild(button);
+      };
+      button.click();
+    });
+  }
+
+  receiveMessage(msg) {
+    switch (msg.name) {
+      case "WaitForChange":
+        return this.changed();
+      case "ExitFullscreen":
+        return this.contentWindow.document.exitFullscreen();
+      case "RequestFullscreen":
+        this.browsingContext.isActive = true;
+        return Promise.all([this.changed(), this.requestFullscreen()]);
+      case "CreateChild":
+        let child = msg.data;
+        let iframe = this.contentWindow.document.createElement("iframe");
+        iframe.allow = child.allow_fullscreen ? "fullscreen" : "";
+        iframe.name = child.name;
+
+        let loaded = new Promise(resolve => {
+          iframe.addEventListener(
+            "load",
+            () => resolve(iframe.browsingContext),
+            { once: true }
+          );
+        });
+        iframe.src = child.url;
+        this.contentWindow.document.body.appendChild(iframe);
+        return loaded;
+      case "GetEvents":
+        return Promise.resolve(this.fullscreen_events);
+      case "ClearEvents":
+        this.fullscreen_events = [];
+        return Promise.resolve();
+      case "GetFullscreenElement":
+        let document = this.contentWindow.document;
+        let child_iframe = this.contentWindow.document.getElementsByTagName(
+          "iframe"
+        )
+          ? this.contentWindow.document.getElementsByTagName("iframe")[0]
+          : null;
+        switch (document.fullscreenElement) {
+          case null:
+            return Promise.resolve("null");
+          case document:
+            return Promise.resolve("document");
+          case document.body:
+            return Promise.resolve("body");
+          case child_iframe:
+            return Promise.resolve("child_iframe");
+          default:
+            return Promise.resolve("other");
+        }
+    }
+
+    return Promise.reject("Unexpected Message");
+  }
+
+  async handleEvent(event) {
+    switch (event.type) {
+      case "fullscreenchange":
+        this.fullscreen_events.push(true);
+        break;
+      case "fullscreenerror":
+        this.fullscreen_events.push(false);
+        break;
+    }
+  }
+}