@Test
 public final void testToString() {
   final StringBuildWriter stringBuildWriter = new StringBuildWriter();
   final StringBuilder expected = new StringBuilder();
   for (int i = 0, size = string.length(); i < size; i++) {
     stringBuildWriter.write(string.substring(i));
     expected.append(string.substring(i));
     assertThat(stringBuildWriter.toString(), is(equalTo(expected.toString())));
   }
 }