assertFalse(sink.wasStreamClosed());

    writer.write(STRING);
    writer.close();

    assertTrue(sink.wasStreamClosed());
    assertEquals(STRING, sink.getString());
  }

  public void testWrite_string() throws IOException {
    assertEquals("", sink.getString());
    sink.write(STRING);

    assertTrue(sink.wasStreamOpened() && sink.wasStreamClosed());
    assertEquals(STRING, sink.getString());
  }

    assertEquals(ASCII, Files.toString(asciiFile, US_ASCII));
    assertEquals(I18N, Files.toString(i18nFile, UTF_8));
    assertThat(Files.toString(i18nFile, US_ASCII)).isNotEqualTo(I18N);
  }

  public void testWriteString() throws IOException {
    File temp = createTempFile();
    Files.write(I18N, temp, UTF_16LE);
    assertEquals(I18N, Files.toString(temp, UTF_16LE));
  }

  public void testWriteBytes() throws IOException {

    assertEquals(ASCII, Files.toString(asciiFile, US_ASCII));
    assertEquals(I18N, Files.toString(i18nFile, UTF_8));
    assertThat(Files.toString(i18nFile, US_ASCII)).isNotEqualTo(I18N);
  }

  public void testWriteString() throws IOException {
    File temp = createTempFile();
    Files.write(I18N, temp, UTF_16LE);
    assertEquals(I18N, Files.toString(temp, UTF_16LE));
  }

  public void testWriteBytes() throws IOException {

	}
	// Does it wrap if existing buffer is too small?
	b2 := NewWriterSize(b, 2*BufSize)
	if b2 == b {
		t.Error("NewWriterSize did not enlarge buffer")
	}
}

func TestWriteString(t *testing.T) {
	const BufSize = 8
	buf := new(strings.Builder)
	b := NewWriterSize(buf, BufSize)
	b.WriteString("0")                         // easy
	b.WriteString("123456")                    // still easy