Test error string

Author: gaffney2010

axelrod/tests/unit/test_load_data.py

@@ -18,5 +18,5 @@ def test_axl_filename(self):
 
     def test_raise_error_if_file_empty(self):
         path = pathlib.Path("not/a/file.py")
-        with self.assertRaises(FileNotFoundError):
+        with self.assertRaisesRegex(FileNotFoundError, str(path)):
             load_file(path, ".")