[PM-5189] Adding some documentation and adjust jest test for util method

apps/browser/src/autofill/utils/index.spec.ts

@@ -38,9 +38,7 @@ describe("generateRandomCustomElementName", () => {
 
 describe("sendExtensionMessage", () => {
   it("sends a message to the extension", async () => {
-    const extensionMessagePromise = sendExtensionMessage("toggleAutofillInlineMenuHidden", {
-      display: "none",
-    });
+    const extensionMessagePromise = sendExtensionMessage("some-extension-message");
 
     // Jest doesn't give anyway to select the typed overload of "sendMessage",
     // a cast is needed to get the correct spy type.

apps/browser/src/autofill/utils/index.ts

@@ -1,6 +1,11 @@
 import { AutofillPort } from "../enums/autofill-port.enum";
 import { FillableFormFieldElement, FormElementWithAttribute, FormFieldElement } from "../types";
 
+/**
+ * Generates a random string of characters.
+ *
+ * @param length - The length of the random string to generate.
+ */
 export function generateRandomChars(length: number): string {
   const chars = "abcdefghijklmnopqrstuvwxyz";
   const randomChars = [];