From 74fdf59941873eb55d6b6197a9a7c0bec1ba9133 Mon Sep 17 00:00:00 2001
From: Kenneth Myhra <kennethmyhra@gmail.com>
Date: Thu, 13 Jul 2023 23:29:01 +0200
Subject: [PATCH] Tests/LibWeb: Add TransformStream transform callback test

This test proves the ability of TransformStream to execute to execute
caller supplied code in the transform callback that can transform
incoming chunks, and have access to TransformStreamDefaultController.
---
 .../TransformStream-transform-callback.txt    |  3 +++
 .../TransformStream-transform-callback.html   | 22 +++++++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100644 Tests/LibWeb/Text/expected/Streams/TransformStream-transform-callback.txt
 create mode 100644 Tests/LibWeb/Text/input/Streams/TransformStream-transform-callback.html

diff --git a/Tests/LibWeb/Text/expected/Streams/TransformStream-transform-callback.txt b/Tests/LibWeb/Text/expected/Streams/TransformStream-transform-callback.txt
new file mode 100644
index 0000000000..37287f17b6
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/Streams/TransformStream-transform-callback.txt
@@ -0,0 +1,3 @@
+Done: false
+HELLO, WORLD!
+Done: true
diff --git a/Tests/LibWeb/Text/input/Streams/TransformStream-transform-callback.html b/Tests/LibWeb/Text/input/Streams/TransformStream-transform-callback.html
new file mode 100644
index 0000000000..f324ee4fa2
--- /dev/null
+++ b/Tests/LibWeb/Text/input/Streams/TransformStream-transform-callback.html
@@ -0,0 +1,22 @@
+<script src="../include.js"></script>
+<script>
+    test(() => {
+        const {writable, readable} = new TransformStream({
+            transform(chunk, controller) {
+                controller.enqueue(chunk.toUpperCase());
+            }
+        });
+        const writer = writable.getWriter();
+        writer.write("Hello, world!");
+        writer.close();
+        const reader = readable.getReader();
+        reader.read().then(function processText({done, value}) {
+            println(`Done: ${done}`);
+            if (done)
+                return;
+
+            println(value);
+            reader.read().then(processText);
+        });
+    });
+</script>