use remove_file in ensure_file_removed

unit test for utils::remove_file

add a test for utils::ensure_file_removed

newline

comment potential solution

drill down to find error type

remove integration tests, moved to utils.rs

moved tests here

Update src/utils/utils.rs

Co-authored-by: 二手掉包工程师 <rustin.liu@gmail.com>

Update src/utils/utils.rs

Co-authored-by: 二手掉包工程师 <rustin.liu@gmail.com>

add a message to panic

cargo fmt

Author: joshrotenberg

src/utils/utils.rs

@@ -392,10 +392,14 @@ pub fn remove_file(name: &'static str, path: &Path) -> Result<()> {
 }
 
 pub fn ensure_file_removed(name: &'static str, path: &Path) -> Result<()> {
-    let result = fs::remove_file(path);
+    let result = remove_file(name, path);
     if let Err(err) = &result {
-        if err.kind() == io::ErrorKind::NotFound {
-            return Ok(());
+        if let Some(retry::Error::Operation { error: e, .. }) =
+            err.downcast_ref::<retry::Error<io::Error>>()
+        {
+            if e.kind() == io::ErrorKind::NotFound {
+                return Ok(());
+            }
         }
     }
     result.with_context(|| RustupError::RemovingFile {
@@ -756,4 +760,39 @@ mod tests {
 
         assert_eq!(expected, v);
     }
+
+    #[test]
+    fn test_remove_file() {
+        let tempdir = tempfile::Builder::new().prefix("rustup").tempdir().unwrap();
+        let f_path = tempdir.path().join("f");
+        File::create(&f_path).unwrap();
+
+        assert!(f_path.exists());
+        assert!(remove_file("f", &f_path).is_ok());
+
+        assert!(!f_path.exists());
+        let result = remove_file("f", &f_path);
+        let err = result.unwrap_err();
+
+        match err.downcast_ref::<RustupError>() {
+            Some(RustupError::RemovingFile { name, path }) => {
+                assert_eq!(*name, "f");
+                assert_eq!(path.clone(), f_path);
+            }
+            _ => panic!("Expected an error removing file"),
+        }
+    }
+
+    #[test]
+    fn test_ensure_file_removed() {
+        let tempdir = tempfile::Builder::new().prefix("rustup").tempdir().unwrap();
+        let f_path = tempdir.path().join("f");
+        File::create(&f_path).unwrap();
+
+        assert!(f_path.exists());
+        assert!(ensure_file_removed("f", &f_path).is_ok());
+
+        assert!(!f_path.exists());
+        assert!(ensure_file_removed("f", &f_path).is_ok());
+    }
 }