1 files changed, 49 insertions, 0 deletions
diff --git a/third_party/rust/nix/test/test_nmount.rs b/third_party/rust/nix/test/test_nmount.rs
new file mode 100644
index 0000000000..dec806a55f
--- /dev/null
+++ b/third_party/rust/nix/test/test_nmount.rs
@@ -0,0 +1,49 @@
+use crate::*;
+use nix::{
+    errno::Errno,
+    mount::{unmount, MntFlags, Nmount},
+};
+use std::{ffi::CString, fs::File, path::Path};
+use tempfile::tempdir;
+
+#[test]
+fn ok() {
+    require_mount!("nullfs");
+
+    let mountpoint = tempdir().unwrap();
+    let target = tempdir().unwrap();
+    let _sentry = File::create(target.path().join("sentry")).unwrap();
+
+    let fstype = CString::new("fstype").unwrap();
+    let nullfs = CString::new("nullfs").unwrap();
+    Nmount::new()
+        .str_opt(&fstype, &nullfs)
+        .str_opt_owned("fspath", mountpoint.path().to_str().unwrap())
+        .str_opt_owned("target", target.path().to_str().unwrap())
+        .nmount(MntFlags::empty())
+        .unwrap();
+
+    // Now check that the sentry is visible through the mountpoint
+    let exists = Path::exists(&mountpoint.path().join("sentry"));
+
+    // Cleanup the mountpoint before asserting
+    unmount(mountpoint.path(), MntFlags::empty()).unwrap();
+
+    assert!(exists);
+}
+
+#[test]
+fn bad_fstype() {
+    let mountpoint = tempdir().unwrap();
+    let target = tempdir().unwrap();
+    let _sentry = File::create(target.path().join("sentry")).unwrap();
+
+    let e = Nmount::new()
+        .str_opt_owned("fspath", mountpoint.path().to_str().unwrap())
+        .str_opt_owned("target", target.path().to_str().unwrap())
+        .nmount(MntFlags::empty())
+        .unwrap_err();
+
+    assert_eq!(e.error(), Errno::EINVAL);
+    assert_eq!(e.errmsg(), Some("Invalid fstype"));
+}