the first actual assetion (#293)

Author: Byron

git-index/src/file.rs

@@ -1,3 +1,22 @@
+mod impls {
+    use crate::{File, State};
+    use std::ops::{Deref, DerefMut};
+
+    impl Deref for File {
+        type Target = State;
+
+        fn deref(&self) -> &Self::Target {
+            &self.state
+        }
+    }
+
+    impl DerefMut for File {
+        fn deref_mut(&mut self) -> &mut Self::Target {
+            &mut self.state
+        }
+    }
+}
+
 pub mod init {
     #![allow(unused)]
 

git-index/src/lib.rs

@@ -9,6 +9,16 @@ pub mod file;
 
 pub(crate) mod extension;
 
+mod access {
+    use crate::{State, Version};
+
+    impl State {
+        pub fn version(&self) -> Version {
+            self.version
+        }
+    }
+}
+
 pub mod init {
     use filetime::FileTime;
 

git-index/tests/file/mod.rs

@@ -1,10 +1,13 @@
 mod init {
+    use git_index::Version;
+
     fn file(name: &str) -> git_index::File {
         git_index::File::at(crate::index_fixture_path(name), git_hash::Kind::Sha1).unwrap()
     }
 
     #[test]
     fn read_v2() {
-        let _file = file("v2");
+        let file = file("v2");
+        assert_eq!(file.version(), Version::V2);
     }
 }