1 files changed, 26 insertions, 0 deletions
diff --git a/src/data.rs b/src/data.rs
index f652a13..6976352 100644
--- a/src/data.rs
+++ b/src/data.rs
@@ -14,3 +14,29 @@ pub fn get_data1() -> SimpleFsData {
         1, vec!(("hello".to_string(),
                  SimpleFsData::File(2, "Hello, World!".to_string()))))
 }
+
+pub fn traverse_fs<F>(file: SimpleFsData, f: &mut F)
+    where F: FnMut(& SimpleFsData) {
+    f(&file);
+    match file {
+        SimpleFsData::Directory(_, children) => for (_, file) in children {
+           traverse_fs(file, f);
+        },
+        _ => (),
+    }
+}
+
+#[test]
+fn traverse() {
+    let mut result = String::new();
+    {
+        let mut f = |ref file: &SimpleFsData| {
+            match *file {
+                &SimpleFsData::File(_, ref s) => result += &s,
+                _ => (),
+            };
+        };
+        traverse_fs(get_data1(), &mut f);
+    }
+    assert_eq!("Hello, World!", result);
+}