nonzero unittests pass

src/main.rs

@@ -1,4 +1,6 @@
 use serde::{Serialize, Deserialize};
+use std::io::Read;
+use std::fs::File;
 
 fn main() {
     println!("Hello, world!");
@@ -17,17 +19,33 @@ struct Add {
 }
 
 fn load_storage(path: String) -> Result<Storage, String> {
-   Err("failed".to_string())
+   match File::open(path.clone()) {
+      Ok(mut reader) => _load_storage(&mut reader),
+      Err(reason) => Err(format!("failed to read storage {}: {}", path, reason)),
+   }
+}
+
+fn _load_storage(reader: &mut dyn Read) -> Result<Storage, String> {
+   match serde_yaml::from_reader::<&mut dyn Read, Storage>(reader) {
+      Ok(storage) => Ok(storage),
+      Err(err) => Err(format!("failed to parse storage: {}", err)),
+   }
 }
 
 #[cfg(test)]
 mod tests {
    use super::*;
 
+   #[test]
+   fn test_load_storage() {
+      let got = _load_storage(&mut "adds: []".as_bytes()).expect("failed to parse 'adds: []' storage");
+      assert_eq!(got, Storage{adds: vec![]});
+   }
+
    #[test]
    fn test_testdata_standalone_yaml() {
       assert_eq!(
-         load_storage("./testdata/standalone.yaml".to_string()).expect("cant load standalone.yaml"),
+         load_storage("./src/testdata/standalone.yaml".to_string()).expect("cant load standalone.yaml"),
          Storage{adds: vec![
             Add{t: 1, add: "def".to_string(), tag: "abc".to_string()},
             Add{t: 2, add: "ghi".to_string(), tag: "".to_string()},

src/testdata/standalone.yaml

@@ -4,3 +4,4 @@ adds:
   tag: abc
 - t: 2
   add: ghi
+  tag: ""