Make decompress limited test work with actual READ_BUFFER_SIZE value

Author: rhpvorderman

tests/test_gzip_compliance.py

@@ -572,13 +572,15 @@ def test_bytes_filename(self):
 
     def test_decompress_limited(self):
         """Decompressed data buffering should be limited"""
-        bomb = igzip.compress(b'\0' * int(2e6), compresslevel=3)
-        self.assertLess(len(bomb), io.DEFAULT_BUFFER_SIZE)
+        bomb_size = int(2e6)
+        self.assertLess(igzip.READ_BUFFER_SIZE, bomb_size)
+        bomb = gzip.compress(b'\0' * bomb_size, compresslevel=9)
+        self.assertLess(len(bomb), igzip.READ_BUFFER_SIZE)
 
         bomb = io.BytesIO(bomb)
         decomp = igzip.GzipFile(fileobj=bomb)
         self.assertEqual(decomp.read(1), b'\0')
-        max_decomp = 1 + io.DEFAULT_BUFFER_SIZE
+        max_decomp = 1 + igzip.READ_BUFFER_SIZE
         self.assertLessEqual(decomp._buffer.raw.tell(), max_decomp,
                              "Excessive amount of data was decompressed")