Patch #1303: Adapt str8 constructor to bytes (now buffer) one.
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 644593d..e826ff4 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -88,7 +88,7 @@
         self.assertEqual(f.tell(), 6)
         self.assertEqual(f.seek(-1, 1), 5)
         self.assertEqual(f.tell(), 5)
-        self.assertEqual(f.write(str8(" world\n\n\n")), 9)
+        self.assertEqual(f.write(str8(b" world\n\n\n")), 9)
         self.assertEqual(f.seek(0), 0)
         self.assertEqual(f.write(b"h"), 1)
         self.assertEqual(f.seek(-1, 2), 13)