Added error codes to store.

src/morethantext/cache.rs

@@ -312,9 +312,9 @@ mod datatype_file {
         let mut feed = data.iter();
         match DataType::from_bytes(&mut feed) {
             Ok(_) => Err(DBError::new("should have raised an error")),
-            Err(err) => {
-                assert_eq!(err.to_string(), "file corruption");
-                Ok(())
+            Err(err) => match err.code {
+                ErrorCode::CorruptFile => Ok(()),
+                _ => Err(DBError::new("incorrect error code")),
             }
         }
     }