assertThat(Strings.commonPrefix("abcde", "xyz")).isEqualTo("");
    assertThat(Strings.commonPrefix("xyz", "abcde")).isEqualTo("");
    assertThat(Strings.commonPrefix("xyz", "abcxyz")).isEqualTo("");
    assertThat(Strings.commonPrefix("abc", "aaaaa")).isEqualTo("a");
    assertThat(Strings.commonPrefix("aa", "aaaaa")).isEqualTo("aa");
    assertThat(Strings.commonPrefix(new StringBuilder("abcdef"), "abcxyz")).isEqualTo("abc");

    assertThat(Strings.commonPrefix("abcde", "xyz")).isEqualTo("");
    assertThat(Strings.commonPrefix("xyz", "abcde")).isEqualTo("");
    assertThat(Strings.commonPrefix("xyz", "abcxyz")).isEqualTo("");
    assertThat(Strings.commonPrefix("abc", "aaaaa")).isEqualTo("a");
    assertThat(Strings.commonPrefix("aa", "aaaaa")).isEqualTo("aa");
    assertThat(Strings.commonPrefix(new StringBuilder("abcdef"), "abcxyz")).isEqualTo("abc");

			testRemaining{0, 0},
		},
	}, {
		maker: makeSparse{makeReg{5, "abcde"}, sparseHoles{{2, 3}}, 8},
		tests: []testFnc{
			testRemaining{8, 5},
			testWrite{"ab\x00\x00\x00cde", 8, nil},
			testWrite{"a", 0, ErrWriteTooLong},
			testRemaining{0, 0},
		},
	}, {
		maker: makeSparse{makeReg{5, "abcde"}, sparseHoles{{2, 3}}, 8},
		tests: []testFnc{

    assertThat(response.body.string()).isEqualTo("ABCDE")
    val request = server.takeRequest()
    assertThat(request.requestLine).isEqualTo("POST /foo HTTP/2")
    assertArrayEquals(postBytes, request.body?.toByteArray())
    assertThat(request.headers["Content-Length"]!!.toInt()).isEqualTo(postBytes.size)
  }

  @Test
  fun connectionReuse() {
    server.enqueue(MockResponse(body = "ABCDEF"))

			testRead{0, "", io.EOF},
		},
	}, {
		maker: makeSparse{makeReg{"abcde", 5}, sparseDatas{{0, 2}, {5, 3}}, 8},
		tests: []testFnc{
			testRemaining{8, 5},
			testRead{3, "ab\x00", nil},
			testRead{10, "\x00\x00cde", io.EOF},
			testRemaining{0, 0},
		},
	}, {
		maker: makeSparse{makeReg{"abcde", 5}, sparseDatas{{0, 2}, {5, 3}}, 8},
		tests: []testFnc{
			testRemaining{8, 5},

    assertSip(new byte[] {}, 0x726fdb47dd0e0e31L);
    assertSip(new byte[] {0x61}, 0x2ba3e8e9a71148caL);
    assertSip(new byte[1000000], 0x28205108397aa742L);
    assertSip("12345678", 0x02130609caea37ebL);
    assertSip("abcdef", 0x2a6e77e733c7c05dL);
    assertSip("SipHash", 0x8325093242a96f60L);
  }

  // Test for common pitfall regarding sign extension.
  // For example: (long) data[i++] | (long) data[i++] << 8 | ...

    assertSip(new byte[] {}, 0x726fdb47dd0e0e31L);
    assertSip(new byte[] {0x61}, 0x2ba3e8e9a71148caL);
    assertSip(new byte[1000000], 0x28205108397aa742L);
    assertSip("12345678", 0x02130609caea37ebL);
    assertSip("abcdef", 0x2a6e77e733c7c05dL);
    assertSip("SipHash", 0x8325093242a96f60L);
  }

  // Test for common pitfall regarding sign extension.
  // For example: (long) data[i++] | (long) data[i++] << 8 | ...

    return new CharSource() {
      @Override
      public Reader openStream() {
        return new StringReader(text);
      }
    };
  }

  public void testSkip() throws Exception {
    String begin = "abcde";
    String end = "fghij";
    Reader joinedReader = CharSource.concat(newCharSource(begin), newCharSource(end)).openStream();

    String expected = begin + end;
    assertEquals(expected.charAt(0), joinedReader.read());

  public void testReadEmptyString() throws IOException {
    assertReadsCorrectly("");
  }

  public void testReadsStringsCorrectly() throws IOException {
    assertReadsCorrectly("abc");
    assertReadsCorrectly("abcde");
    assertReadsCorrectly("abcdefghijkl");
    assertReadsCorrectly(
        ""
            + "abcdefghijklmnopqrstuvwxyz\n"
            + "ABCDEFGHIJKLMNOPQRSTUVWXYZ\r"
            + "0123456789\r\n"

    val response =
      MockResponse
        .Builder()
        .chunkedBody("ABCDE\nFGHIJ\nKLMNO\nPQR", 8)
        .build()
    server.enqueue(response)
    server.enqueue(response)
    val request = newRequest("/")
    val c1 = getResponse(request)
    assertContent("ABCDE", c1, 5)
    val c2 = getResponse(request)
    assertContent("ABCDE", c2, 5)
    c1.close()
    c2.close()
  }

  @Test