test GlobError accessor methods

This also adds more explicit tests for the generated error.

Author: blaenk

src/lib.rs

@@ -899,13 +899,24 @@ mod test {
         assert!(glob("abc[def").err().unwrap().pos == 3);
     }
 
+    // this test assumes that there is a /root directory and that
+    // the user running this test is not root or otherwise doesn't
+    // have permission to read its contents
     #[cfg(unix)]
     #[test]
     fn test_iteration_errors() {
         let mut iter = glob("/root/*").unwrap();
+
+        // GlobErrors shouldn't halt iteration
         let next = iter.next();
         assert!(next.is_some());
-        assert!(next.unwrap().is_err());
+
+        let err = next.unwrap();
+        assert!(err.is_err());
+
+        let err = err.unwrap_err();
+        assert!(*err.path() == Path::new("/root"));
+        assert!(err.error().kind == ::std::io::IoErrorKind::PermissionDenied);
     }
 
     #[test]