1 files changed, 52 insertions, 0 deletions
diff --git a/dom/quota/test/modules/system/worker/UtilsChild.mjs b/dom/quota/test/modules/system/worker/UtilsChild.mjs
new file mode 100644
index 0000000000..d3b5455a59
--- /dev/null
+++ b/dom/quota/test/modules/system/worker/UtilsChild.mjs
@@ -0,0 +1,52 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+function _sendMessage(messageBody) {
+  const messageHeader = {
+    moduleName: "UtilsParent",
+    objectName: "UtilsParent",
+  };
+
+  const message = { ...messageHeader, ...messageBody };
+
+  postMessage(message);
+}
+
+function _recvMessage() {
+  return new Promise(function (resolve) {
+    addEventListener("message", async function onMessage(event) {
+      removeEventListener("message", onMessage);
+      const data = event.data;
+      resolve(data);
+    });
+  });
+}
+
+export const UtilsChild = {
+  async getCachedOriginUsage() {
+    _sendMessage({
+      op: "getCachedOriginUsage",
+    });
+
+    return _recvMessage();
+  },
+
+  async shrinkStorageSize(size) {
+    _sendMessage({
+      op: "shrinkStorageSize",
+      size,
+    });
+
+    return _recvMessage();
+  },
+
+  async restoreStorageSize() {
+    _sendMessage({
+      op: "restoreStorageSize",
+    });
+
+    return _recvMessage();
+  },
+};