add File Ext2 test

src/error.rs

@@ -1,9 +1,14 @@
+#[cfg(any(test, not(feature = "no_std")))]
+use std::io;
+
 /// The set of all possible errors
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+#[derive(Debug)]
 pub enum Error {
     BadMagic(u16),
     OutOfBounds(usize),
     BadBlockGroupCount(u32, u32),
+    #[cfg(any(test, not(feature = "no_std")))]
+    Io(io::Error),
 }
 
 impl From<Infallible> for Error {
@@ -12,4 +17,11 @@ impl From<Infallible> for Error {
     }
 }
 
+#[cfg(any(test, not(feature = "no_std")))]
+impl From<io::Error> for Error {
+    fn from(err: io::Error) -> Error {
+        Error::Io(err)
+    }
+}
+
 pub enum Infallible {}

src/fs.rs

@@ -27,3 +27,18 @@ where
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use std::fs::File;
+    use std::cell::RefCell;
+
+    use super::Ext2;
+
+    #[test]
+    fn file() {
+        let file = RefCell::new(File::open("ext2.bin").unwrap());
+        let mut fs = Ext2::new(file);
+        assert!(fs.init().is_ok());
+    }
+}