assertTrue(source.wasStreamOpened());
    assertTrue(source.wasStreamClosed());
  }

  public void testCopyToAppendable_doesNotCloseIfWriter() throws IOException {
    TestWriter writer = new TestWriter();
    assertFalse(writer.closed());
    source.copyTo(writer);
    assertFalse(writer.closed());
  }

  public void testClosesOnErrors_copyingToCharSinkThatThrows() {

		_, err := buf.ReadString('\n')
		if err != nil {
			t.Fatal(err)
		}
	})
	if allocs != 1 {
		t.Errorf("Unexpected number of allocations, got %f, want 1", allocs)
	}
}

func TestWriter(t *testing.T) {
	var data [8192]byte

	for i := 0; i < len(data); i++ {
		data[i] = byte(' ' + i%('~'-' '))
	}
	w := new(bytes.Buffer)
	for i := 0; i < len(bufsizes); i++ {