maint(core uuid): Extend with documentation and test from thet-own-needs with similar changes.

Author: thet

src/core/dom.js

@@ -532,7 +532,7 @@ const escape_css_id = (id) => {
 };
 
 /**
- * Get a universally unique id (uuid) for a DOM element.
+ * Set and get a universally unique id (uuid) for a DOM element.
  *
  * This method returns a uuid for the given element. On the first call it will
  * generate a uuid and store it on the element.

src/core/uuid.test.js

@@ -19,4 +19,8 @@ describe("uuid", function () {
 
         window.crypto.randomUUID = orig_randomUUID;
     });
+
+    it("the uuid is unique", function () {
+        expect(create_uuid()).not.toBe(create_uuid());
+    });
 });