@Test public void writeAscii_long() {

  assertThat(writeAscii(-1005656679588439279L))
      .isEqualTo("-1005656679588439279");
  assertThat(writeAscii(0L))
      .isEqualTo("0");
  assertThat(writeAscii(-9223372036854775808L /* Long.MIN_VALUE */))
      .isEqualTo("-9223372036854775808");
  assertThat(writeAscii(123456789L))
      .isEqualTo("123456789");
}