diff --git a/test/gzip_test.dart b/test/gzip_test.dart
index a42081b..08c7d99 100644
--- a/test/gzip_test.dart
+++ b/test/gzip_test.dart
@@ -1,25 +1,21 @@
 import 'dart:convert';
+import 'dart:io';
 import 'dart:typed_data';
 
 import 'package:gzip/gzip.dart';
 import 'package:test/test.dart';
 
-const dec = Base64Decoder();
 const enc = Utf8Encoder();
 void main() {
-  for (final (:name, :input, :output) in [
-    (
-      name: 'Simple ASCII',
-      input: enc.convert('Hello World'),
-      output: dec.convert('H4sIAAAAAAAAA/NIzcnJVwjPL8pJAQBWsRdKCwAAAA=='),
-    ),
-    (
-      name: 'More complex',
-      input: enc.convert('éàöñ 漢 こんにちは به متنی©®€£µ¥'),
-      output: dec.convert('H4sIAAAAAAAAAwE3AMj/w6nDoMO2w7Eg5ryiIOOBk+OCk+OBq+O'
-          'BoeOBryDYqNmHINmF2KrZhtuMwqnCruKCrMKjwrXCpXqkccQ3AAAA'),
-    ),
-  ]) {
+  for (final (:name, :input, output: outputList) in cases) {
+    const osBit = 9;
+    outputList[osBit] = switch (Platform.operatingSystem) {
+      'linux' => 3,
+      'macos' => 19,
+      'windows' => 10,
+      String() => throw UnimplementedError('No id for this platform found'),
+    };
+    final output = Uint8List.fromList(outputList);
     test(
       'Compress $name',
       () async => expect(await GZip().compress(input), output),
@@ -44,3 +40,127 @@ void main() {
     );
   }
 }
+
+final cases = [
+  (
+    name: 'Simple ASCII',
+    input: enc.convert('Hello World'),
+    output: [
+      31,
+      139,
+      8,
+      0,
+      0,
+      0,
+      0,
+      0,
+      0,
+      3,
+      243,
+      72,
+      205,
+      201,
+      201,
+      87,
+      8,
+      207,
+      47,
+      202,
+      73,
+      1,
+      0,
+      86,
+      177,
+      23,
+      74,
+      11,
+      0,
+      0,
+      0
+    ],
+  ),
+  (
+    name: 'More complex',
+    input: enc.convert('éàöñ 漢 こんにちは به متنی©®€£µ¥'),
+    output: [
+      31,
+      139,
+      8,
+      0,
+      0,
+      0,
+      0,
+      0,
+      0,
+      3,
+      1,
+      55,
+      0,
+      200,
+      255,
+      195,
+      169,
+      195,
+      160,
+      195,
+      182,
+      195,
+      177,
+      32,
+      230,
+      188,
+      162,
+      32,
+      227,
+      129,
+      147,
+      227,
+      130,
+      147,
+      227,
+      129,
+      171,
+      227,
+      129,
+      161,
+      227,
+      129,
+      175,
+      32,
+      216,
+      168,
+      217,
+      135,
+      32,
+      217,
+      133,
+      216,
+      170,
+      217,
+      134,
+      219,
+      140,
+      194,
+      169,
+      194,
+      174,
+      226,
+      130,
+      172,
+      194,
+      163,
+      194,
+      181,
+      194,
+      165,
+      122,
+      164,
+      113,
+      196,
+      55,
+      0,
+      0,
+      0
+    ],
+  ),
+];