1 files changed, 35 insertions, 0 deletions
diff --git a/testing/web-platform/tests/uievents/mouse/resources/utils.js b/testing/web-platform/tests/uievents/mouse/resources/utils.js
new file mode 100644
index 0000000000..6f5f6f4b6c
--- /dev/null
+++ b/testing/web-platform/tests/uievents/mouse/resources/utils.js
@@ -0,0 +1,35 @@
+// Sends to Window |w| the object |{type, param}|.
+function sendMessage(w, type, param) {
+  w.postMessage({"type": type, "param": param}, "*");
+}
+
+// Returns a |Promise| that gets resolved with the event object when |target|
+// receives an event of type |event_type|.
+function getEvent(event_type, target) {
+  return new Promise(resolve => {
+    target.addEventListener(event_type, e => resolve(e), {once: true});
+  });
+}
+
+// Adds a listener that is automatically removed at the end of the test.
+function addTestScopedListener(target, type, listener, test) {
+  target.addEventListener(type, listener);
+  test.add_cleanup(() => {
+    target.removeEventListener(type, listener);
+  });
+}
+
+// Returns a |Promise| that gets resolved with |event.data| when |window|
+// receives from |source| a "message" event whose |event.data.type| matches the string
+// |message_data_type|.
+function getMessageData(message_data_type, source) {
+  return new Promise(resolve => {
+    function waitAndRemove(e) {
+      if (e.source != source || !e.data || e.data.type != message_data_type)
+        return;
+      window.removeEventListener("message", waitAndRemove);
+      resolve(e.data);
+    }
+    window.addEventListener("message", waitAndRemove);
+  });
+}