buf = NewReaderSize(dataAndEOFReader("abcd"), 32)
	if s, err := buf.Peek(2); string(s) != "ab" || err != nil {
		t.Errorf(`Peek(2) on "abcd", EOF = %q, %v; want "ab", nil`, string(s), err)
	}
	if s, err := buf.Peek(4); string(s) != "abcd" || err != nil {
		t.Errorf(`Peek(4) on "abcd", EOF = %q, %v; want "abcd", nil`, string(s), err)
	}
	if n, err := buf.Read(p[0:5]); string(p[0:n]) != "abcd" || err != nil {

        assertOrder(X_GT_Y, "1.0m.1", "1.0");
        assertOrder(X_GT_Y, "1.0m-1", "1.0");
    }

    @Test
    void testUnknownQualifierOrdering() {
        assertOrder(X_LT_Y, "1-abc", "1-abcd");
        assertOrder(X_LT_Y, "1-abc", "1-bcd");
        assertOrder(X_GT_Y, "1-abc", "1-aac");
    }

    @Test
    void testCaseInsensitiveOrderingOfQualifiers() {

    assertTrue(emptyConcat.isEmpty());
  }

  public void testConcat_infiniteIterable() throws IOException {
    CharSource source = CharSource.wrap("abcd");
    Iterable<CharSource> cycle = Iterables.cycle(ImmutableList.of(source));
    CharSource concatenated = CharSource.concat(cycle);

    String expected = "abcdabcd";