options,
      rpc_server,
      tempdir,
      index,
    })
  }

  pub(crate) fn arg(mut self, arg: impl Into<OsString>) -> Self {
    self.args.push(arg.into());
    self
  }

  pub(crate) fn args<T: Into<OsString>, I: IntoIterator<Item = T>>(mut self, args: I) -> Self {
    self.args.extend(args.into_iter().map(|arg| arg.into()));
    self
  }

  pub(crate) fn tempdir(mut self, tempdir: TempDir) -> Self {
    self.tempdir = Some(tempdir);
    self
  }
}

pub(crate) struct Context {
  pub(crate) options: Options,
  pub(crate) rpc_server: test_bitcoincore_rpc::Handle,
  #[allow(unused)]
  pub(crate) tempdir: TempDir,
  pub(crate) index: Index,
}

impl Context {
  pub(crate) fn builder() -> ContextBuilder {
    ContextBuilder {
      args: Vec::new(),
      tempdir: None,
      chain: Chain::Regtest,
    }
  }

  pub(crate) fn mine_blocks(&self, n: u64) -> Vec<Block> {
    let blocks = self.rpc_server.mine_blocks(n);
    self.index.update().unwrap();
    blocks
  }

  pub(crate) fn mine_blocks_with_subsidy(&self, n: u64, subsidy: u64) -> Vec<Block> {