LibWeb/Tests: Add a basic test for a blob URL given to a Worker

Author: https://github.com/shannonbooth
Commit: 5a0f7c5f63
Pull-request: https://github.com/SerenityOS/serenity/pull/24220
Reviewed-by: https://github.com/kennethmyhra

Tests/LibWeb/Text/input/Worker/Worker-blob.html

@@ -0,0 +1,21 @@
+<script src="../include.js"></script>
+<script>
+    asyncTest((done) => {
+        const workerScript = `
+            self.onmessage = function(evt) {
+                self.postMessage('WHF! :^)');
+            };
+        `;
+        const blob = new Blob([workerScript], { type: 'application/javascript' });
+        const workerScriptURL = URL.createObjectURL(blob);
+        const worker = new Worker(workerScriptURL);
+
+        worker.onmessage = function(evt) {
+            println('Message received from worker: ' + JSON.stringify(evt.data));
+            done();
+        };
+
+        // Send a message to the worker
+        worker.postMessage('Hello from main script');
+    });
+</script>