From 1612c1688e7cce839c6efc29a06590652d8f0022 Mon Sep 17 00:00:00 2001
From: devgianlu <altomanigianluca@gmail.com>
Date: Sat, 1 Mar 2025 23:23:09 +0100
Subject: [PATCH] LibWeb: Change hardcoded compression test to round trip

As compression is not always deterministic, we cannot hardcode what
it'll be like, do a round trip instead.
---
 .../Compression/CompressionStream.txt         |  3 -
 .../Text/expected/Compression/round-trip.txt  | 24 ++++++++
 .../input/Compression/CompressionStream.html  | 31 ----------
 .../Text/input/Compression/round-trip.html    | 56 +++++++++++++++++++
 4 files changed, 80 insertions(+), 34 deletions(-)
 delete mode 100644 Tests/LibWeb/Text/expected/Compression/CompressionStream.txt
 create mode 100644 Tests/LibWeb/Text/expected/Compression/round-trip.txt
 delete mode 100644 Tests/LibWeb/Text/input/Compression/CompressionStream.html
 create mode 100644 Tests/LibWeb/Text/input/Compression/round-trip.html

diff --git a/Tests/LibWeb/Text/expected/Compression/CompressionStream.txt b/Tests/LibWeb/Text/expected/Compression/CompressionStream.txt
deleted file mode 100644
index f9dc0b7f781..00000000000
--- a/Tests/LibWeb/Text/expected/Compression/CompressionStream.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-format=deflate: eJwLT83JUchIzcnJV0grykzNSylWBABGEQb1
-format=deflate-raw: C0/NyVHISM3JyVdIK8pMzUspVgQA
-format=gzip: H4sIAAAAAAADAwtPzclRyEjNyclXSCvKTM1LKVYEAHN0w4sTAAAA
diff --git a/Tests/LibWeb/Text/expected/Compression/round-trip.txt b/Tests/LibWeb/Text/expected/Compression/round-trip.txt
new file mode 100644
index 00000000000..889b6976811
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/Compression/round-trip.txt
@@ -0,0 +1,24 @@
+prefix=120,156
+equal=false
+format=deflate: Well hello friends!
+--------------
+prefix=
+equal=false
+format=deflate-raw: Well hello friends!
+--------------
+prefix=31,139
+equal=false
+format=gzip: Well hello friends!
+--------------
+prefix=120,156
+equal=false
+format=deflate: Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!
+--------------
+prefix=
+equal=false
+format=deflate-raw: Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!
+--------------
+prefix=31,139
+equal=false
+format=gzip: Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!Well hello friends!
+--------------
diff --git a/Tests/LibWeb/Text/input/Compression/CompressionStream.html b/Tests/LibWeb/Text/input/Compression/CompressionStream.html
deleted file mode 100644
index a0ffc4fa077..00000000000
--- a/Tests/LibWeb/Text/input/Compression/CompressionStream.html
+++ /dev/null
@@ -1,31 +0,0 @@
-<script src="../include.js"></script>
-<script>
-    asyncTest(async done => {
-        const text = "Well hello friends!";
-
-        for (const format of ["deflate", "deflate-raw", "gzip"]) {
-            let stream = new Blob([text]).stream();
-
-            let compressor = stream.pipeThrough(new CompressionStream(format));
-            let reader = compressor.getReader();
-
-            let buffer = new ArrayBuffer(256);
-            let offset = 0;
-
-            while (true) {
-                let result = await reader.read();
-                if (result.done) {
-                    break;
-                }
-
-                new Uint8Array(buffer).set(result.value, offset);
-                offset += result.value.byteLength;
-            }
-
-            let result = new Uint8Array(buffer, 0, offset).toBase64();
-            println(`format=${format}: ${result}`);
-        }
-
-        done();
-    });
-</script>
diff --git a/Tests/LibWeb/Text/input/Compression/round-trip.html b/Tests/LibWeb/Text/input/Compression/round-trip.html
new file mode 100644
index 00000000000..2a34bd82ef8
--- /dev/null
+++ b/Tests/LibWeb/Text/input/Compression/round-trip.html
@@ -0,0 +1,56 @@
+<script src="../include.js"></script>
+<script>
+    function readStream(reader) {
+        return new Promise((resolve, reject) => {
+            let chunks = [];
+            reader.read().then(function pump({value, done}) {
+                if (done) {
+                    let blob = new Blob(chunks);
+                    blob.arrayBuffer().then((b) => resolve(new Uint8Array(b, 0, blob.size))).catch(reject)
+                    return;
+                }
+                chunks.push(value);
+                reader.read().then(pump);
+            });
+        });
+    }
+
+    function compress(data, format) {
+        let stream = new Blob([data]).stream();
+        let compressor = stream.pipeThrough(new CompressionStream(format));
+        let reader = compressor.getReader();
+        return readStream(reader);
+    }
+
+    function decompress(data, format) {
+        let stream = new Blob([data]).stream();
+        let decompressor = stream.pipeThrough(new DecompressionStream(format));
+        let reader = decompressor.getReader();
+        return readStream(reader);
+    }
+
+    async function roundTrip(data) {
+        let expectedPrefixLengths = {
+            'deflate': 2,
+            'deflate-raw': 0,
+            'gzip': 2
+        }
+
+        for (const format of ["deflate", "deflate-raw", "gzip"]) {
+            let compressed = await compress(data, format);
+            println(`prefix=${compressed.slice(0, expectedPrefixLengths[format])}`)
+            println(`equal=${data === compressed}`)
+
+            let decompressed = await decompress(compressed, format);
+            let result = new TextDecoder().decode(decompressed);
+            println(`format=${format}: ${result}`);
+            println('--------------')
+        }
+    }
+
+    asyncTest(async done => {
+        await roundTrip('Well hello friends!')
+        await roundTrip('Well hello friends!'.repeat(100))
+        done();
+    });
+</script>