From ff3ae4521ba7fffb36e4038cbc89144a59681d84 Mon Sep 17 00:00:00 2001
From: "M.Amin Rayej" <m.amin.rayej@gmail.com>
Date: Tue, 14 May 2024 15:48:42 +0330
Subject: [PATCH] add a test to wasi-fyi tess

---
 tests/wasi-fyi/fs_seek_append_mode.rs | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 tests/wasi-fyi/fs_seek_append_mode.rs

diff --git a/tests/wasi-fyi/fs_seek_append_mode.rs b/tests/wasi-fyi/fs_seek_append_mode.rs
new file mode 100644
index 00000000000..7e1d54321f0
--- /dev/null
+++ b/tests/wasi-fyi/fs_seek_append_mode.rs
@@ -0,0 +1,24 @@
+use std::fs::OpenOptions;
+use std::io::prelude::*;
+use std::io::SeekFrom;
+
+fn main() {
+    let mut file = OpenOptions::new()
+        .append(true)
+        .read(true)
+        .create(true)
+        .open("file")
+        .unwrap();
+
+    // file offset must be 1 now
+    write!(file, "{}", "a").unwrap();
+
+    // rewind should not work on file in append mode
+    // since the offset must always be at the end of the file
+    let _ = file.rewind();
+
+    // file offset must be 2 now
+    write!(file, "{}", "b").unwrap();
+
+    assert_eq!(file.seek(SeekFrom::Current(0)).unwrap(), 2);
+}