message: delete storage before test and after
diff: @@ -793,6 +793,7 @@ mod tests {
  use super::*;
  use super::super::Tag;
  + use std::path::Path;
  #[test]
  fn sqlite_storage_type_create_works() {
  @@ -810,8 +811,15 @@ mod tests {
  "path": _custom_path("sqlite_storage_type_create_works_for_custom_path")
  }).to_string();
  + let my_path = _custom_path("sqlite_storage_type_create_works_for_custom_path");
  + let path = Path::new(&my_path);
  + if path.exists() {
  + fs::remove_file(path).unwrap();
  + }
  let storage_type = SQLiteStorageType::new();
  storage_type.create_storage("sqlite_storage_type_create_works_for_custom_path", Some(&config), None, &_metadata()).unwrap();
  +
  + storage_type.delete_storage("sqlite_storage_type_create_works_for_custom_path", None, None).unwrap();
  }
  #[test]
  @@ -823,6 +831,8 @@ mod tests {
  let res = storage_type.create_storage("sqlite_storage_type_create_works_for_twice", None, None, &_metadata());
  assert_kind!(IndyErrorKind::WalletAlreadyExists, res);
  +
  + storage_type.delete_storage("sqlite_storage_type_create_works_for_twice", None, None).unwrap();
  }
  #[test]
  