From 06080c4d87766a717ab2b7f31f5d418b651e6969 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Wed, 29 Dec 2021 23:55:32 -0500
Subject: test

---
 tests/fds.rs | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 tests/fds.rs

diff --git a/tests/fds.rs b/tests/fds.rs
new file mode 100644
index 0000000..7ef802d
--- /dev/null
+++ b/tests/fds.rs
@@ -0,0 +1,47 @@
+#[test]
+fn test_fds() {
+    use std::io::BufRead as _;
+
+    check_open_fds();
+
+    let pty = pty_process::blocking::Pty::new().unwrap();
+    pty.resize(pty_process::Size::new(24, 80)).unwrap();
+    let mut child = pty_process::blocking::Command::new("perl")
+        .arg("-Efor my $fd (0..255) { open my $fh, \"<&=$fd\"; print $fd if stat $fh }; say")
+        .spawn(&pty)
+        .unwrap();
+    let mut buf = vec![];
+    std::io::BufReader::new(&pty)
+        .read_until(b'\n', &mut buf)
+        .unwrap();
+    assert_eq!(&buf, b"012\r\n");
+    let status = child.wait().unwrap();
+    assert_eq!(status.code().unwrap(), 0);
+    drop(pty);
+    check_open_fds();
+
+    let pty = pty_process::blocking::Pty::new().unwrap();
+    pty.resize(pty_process::Size::new(24, 80)).unwrap();
+    let mut child = pty_process::blocking::Command::new("perl")
+        .arg("-Efor my $fd (0..255) { open my $fh, \"<&=$fd\"; print $fd if stat $fh }; say")
+        .stderr(Some(std::process::Stdio::null()))
+        .spawn(&pty)
+        .unwrap();
+    let mut buf = vec![];
+    std::io::BufReader::new(&pty)
+        .read_until(b'\n', &mut buf)
+        .unwrap();
+    assert_eq!(&buf, b"012\r\n");
+    let status = child.wait().unwrap();
+    assert_eq!(status.code().unwrap(), 0);
+    drop(pty);
+    check_open_fds();
+}
+
+#[track_caller]
+fn check_open_fds() {
+    let open: Vec<_> = (0..=255)
+        .filter(|fd| nix::sys::stat::fstat(*fd).is_ok())
+        .collect();
+    assert_eq!(open, vec![0, 1, 2]);
+}
-- 
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