From 221f18f72ec3b0e9e215f9d01583ca0c6a93ad66 Mon Sep 17 00:00:00 2001
From: Kenneth Myhra <kennethmyhra@gmail.com>
Date: Fri, 14 Jul 2023 07:47:05 +0200
Subject: [PATCH] Tests/LibWeb: Add TransformStream flush callback test

This test proves the ability of TransformStream to execute
caller supplied code in the flush callback, and have access to
TransformStreamDefaultController.
---
 .../TransformStream-flush-callback.txt        |  5 ++++
 .../TransformStream-flush-callback.html       | 25 +++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 Tests/LibWeb/Text/expected/Streams/TransformStream-flush-callback.txt
 create mode 100644 Tests/LibWeb/Text/input/Streams/TransformStream-flush-callback.html

diff --git a/Tests/LibWeb/Text/expected/Streams/TransformStream-flush-callback.txt b/Tests/LibWeb/Text/expected/Streams/TransformStream-flush-callback.txt
new file mode 100644
index 0000000000..3d65b242bc
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/Streams/TransformStream-flush-callback.txt
@@ -0,0 +1,5 @@
+Done: false
+HELLO, WORLD!
+Done: false
+Enqueued in flush, this the last chunk that will be processed.
+Done: true
diff --git a/Tests/LibWeb/Text/input/Streams/TransformStream-flush-callback.html b/Tests/LibWeb/Text/input/Streams/TransformStream-flush-callback.html
new file mode 100644
index 0000000000..fb3310bcdd
--- /dev/null
+++ b/Tests/LibWeb/Text/input/Streams/TransformStream-flush-callback.html
@@ -0,0 +1,25 @@
+<script src="../include.js"></script>
+<script>
+  test(() => {
+    const {writable, readable} = new TransformStream({
+      transform(chunk, controller) {
+        controller.enqueue(chunk.toUpperCase());
+      },
+      flush(controller) {
+          controller.enqueue("Enqueued in flush, this the last chunk that will be processed.");
+      }
+    });
+    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>