stdin: Vec::new(),
      tempdir: TempDir::new().unwrap(),
    }
  }

  pub(crate) fn write(self, path: impl AsRef<Path>, contents: impl AsRef<[u8]>) -> Self {
    fs::write(self.tempdir.path().join(path), contents).unwrap();
    self
  }

  pub(crate) fn rpc_server(self, rpc_server: &test_bitcoincore_rpc::Handle) -> Self {
    Self {
      rpc_server_url: Some(rpc_server.url()),
      ..self
    }
  }

  pub(crate) fn stdin(self, stdin: Vec<u8>) -> Self {
    Self { stdin, ..self }
  }

  pub(crate) fn stdout_regex(self, expected_stdout: impl AsRef<str>) -> Self {
    Self {
      expected_stdout: Expected::regex(expected_stdout.as_ref()),
      ..self
    }
  }

  pub(crate) fn expected_stderr(self, expected_stderr: impl AsRef<str>) -> Self {
    Self {
      expected_stderr: Expected::String(expected_stderr.as_ref().to_owned()),
      ..self
    }
  }

  pub(crate) fn stderr_regex(self, expected_stderr: impl AsRef<str>) -> Self {
    Self {
      expected_stderr: Expected::regex(expected_stderr.as_ref()),