Tests/LibWeb: Add TransformStream start callback test

This test proves the ability of TransformStream to execute caller supplied code in the start callback, and have access to TransformStreamDefaultController.
Author: https://github.com/kennethmyhra Commit: 5c6125c92b Pull-request: https://github.com/SerenityOS/serenity/pull/19998 Reviewed-by: https://github.com/awesomekling Reviewed-by: https://github.com/shannonbooth
2025-09-22 01:08:56 +00:00 · 2023-07-13 23:43:20 +02:00 · 2023-07-13 23:43:20 +02:00 · 5c6125c92b · 2024-07-16 23:17:55 +09:00
commit 5c6125c92b
parent 74fdf59941
2 changed files with 23 additions and 0 deletions
--- a/Tests/LibWeb/Text/input/Streams/TransformStream-start-callback.html
+++ b/Tests/LibWeb/Text/input/Streams/TransformStream-start-callback.html
@ -0,0 +1,20 @@
+<script src="../include.js"></script>
+<script>
+    test(() => {
+        const {readable} = new TransformStream({
+            start(controller) {
+                println("In start");
+                controller.enqueue("Hello, world!");
+            }
+        });
+        const reader = readable.getReader();
+        reader.read().then(function processText({done, value}) {
+            println(`Done: ${done}`);
+            if (done)
+                return;
+
+            println(value);
+            reader.read().then(processText);
+        });
+    });
+</script>