1 files changed, 21 insertions, 0 deletions
diff --git a/tests/fs_file.rs b/tests/fs_file.rs
index bf2f1d7..1f4760e 100644
--- a/tests/fs_file.rs
+++ b/tests/fs_file.rs
@@ -22,6 +22,27 @@ async fn basic_read() {
 
     assert_eq!(n, HELLO.len());
     assert_eq!(&buf[..n], HELLO);
+
+    // Drop the data from the cache to stimulate uncached codepath on Linux (see preadv2 in
+    // file.rs)
+    #[cfg(target_os = "linux")]
+    {
+        use std::os::unix::io::AsRawFd;
+        nix::unistd::fsync(tempfile.as_raw_fd()).unwrap();
+        nix::fcntl::posix_fadvise(
+            tempfile.as_raw_fd(),
+            0,
+            0,
+            nix::fcntl::PosixFadviseAdvice::POSIX_FADV_DONTNEED,
+        )
+        .unwrap();
+    }
+
+    let mut file = File::open(tempfile.path()).await.unwrap();
+    let n = file.read(&mut buf).await.unwrap();
+
+    assert_eq!(n, HELLO.len());
+    assert_eq!(&buf[..n], HELLO);
 }
 
 #[tokio::test]