var ErrInvalidChecksum = errors.New("invalid checksum")

// SetExpectedMin set expected minimum data expected from reader
func (r *Reader) SetExpectedMin(expectedMin int64) {
	r.expectedMin = expectedMin
}

// SetExpectedMax set expected max data expected from reader
func (r *Reader) SetExpectedMax(expectedMax int64) {
	r.expectedMax = expectedMax
}

  // Depends on the correctness of BigIntegerMath.factorial.
  public void testFactorial() {
    for (int n = 0; n <= 50; n++) {
      BigInteger expectedBig = BigIntegerMath.factorial(n);
      int expectedInt = fitsInInt(expectedBig) ? expectedBig.intValue() : Integer.MAX_VALUE;
      assertEquals(expectedInt, IntMath.factorial(n));
    }
  }

  public void testFactorialNegative() {
    for (int n : NEGATIVE_INTEGER_CANDIDATES) {

    void testSetAndGetMid() {
        // Given
        long expectedMid = 12345L;
        doNothing().when(messageBlock).setMid(expectedMid);
        when(messageBlock.getMid()).thenReturn(expectedMid);

        // When
        messageBlock.setMid(expectedMid);
        long actualMid = messageBlock.getMid();

        // Then
        assertEquals(expectedMid, actualMid);
        verify(messageBlock).setMid(expectedMid);

    val certificatePinner = builder.build()
    val expectedPins =
      Arrays.asList(
        CertificatePinner.Pin("example.com", certA1Sha256Pin),
        CertificatePinner.Pin("www.example.com", certA1Sha256Pin),
      )
    assertEquals(expectedPins, builder.pins)
    assertEquals(HashSet(expectedPins), certificatePinner.pins)
  }

  companion object {
    val certA1 =