diff --git a/tests/io/file_long_read3.py b/tests/io/file_long_read3.py
new file mode 100644
index 0000000000..f25f044385
--- /dev/null
+++ b/tests/io/file_long_read3.py
@@ -0,0 +1,4 @@
+f = open("io/data/bigfile2", "rb")
+b = f.read(512)
+print(len(b))
+print(b)