1 files changed, 39 insertions, 0 deletions
diff --git a/third_party/rust/tokio/tests/fs_copy.rs b/third_party/rust/tokio/tests/fs_copy.rs
new file mode 100644
index 0000000000..e6e5b666f4
--- /dev/null
+++ b/third_party/rust/tokio/tests/fs_copy.rs
@@ -0,0 +1,39 @@
+#![warn(rust_2018_idioms)]
+#![cfg(all(feature = "full", not(tokio_wasi)))] // WASI does not support all fs operations
+
+use tempfile::tempdir;
+use tokio::fs;
+
+#[tokio::test]
+async fn copy() {
+    let dir = tempdir().unwrap();
+
+    let source_path = dir.path().join("foo.txt");
+    let dest_path = dir.path().join("bar.txt");
+
+    fs::write(&source_path, b"Hello File!").await.unwrap();
+    fs::copy(&source_path, &dest_path).await.unwrap();
+
+    let from = fs::read(&source_path).await.unwrap();
+    let to = fs::read(&dest_path).await.unwrap();
+
+    assert_eq!(from, to);
+}
+
+#[tokio::test]
+async fn copy_permissions() {
+    let dir = tempdir().unwrap();
+    let from_path = dir.path().join("foo.txt");
+    let to_path = dir.path().join("bar.txt");
+
+    let from = tokio::fs::File::create(&from_path).await.unwrap();
+    let mut from_perms = from.metadata().await.unwrap().permissions();
+    from_perms.set_readonly(true);
+    from.set_permissions(from_perms.clone()).await.unwrap();
+
+    tokio::fs::copy(from_path, &to_path).await.unwrap();
+
+    let to_perms = tokio::fs::metadata(to_path).await.unwrap().permissions();
+
+    assert_eq!(from_perms, to_perms);
+}