cpp-bignumber/test/biginteger.t.h

//
//  biginteger.t.h
//  bigdecimal
//
//  Created by Sam Jaffe on 6/30/17.
//

#pragma once

#include "biginteger.h"

#include <cxxtest/TestSuite.h>

class biginteger_TestSuite : public CxxTest::TestSuite {
public:
  void testAddPastBounds() {
    math::biginteger bi{999999999ULL};
    TS_ASSERT_EQUALS((bi+1).to_string(), "1000000000");
  }
  
  void testAddReciprocalIsZero() {
    math::biginteger bi{1000};
    TS_ASSERT_EQUALS((bi+(-bi)).to_string(), "0");
  }

  void testAddNegativeLargerGivesNegative() {
    math::biginteger bi{1000};
    TS_ASSERT_EQUALS((bi+(-1001)).to_string(), "-1");
  }

  void testAddNegativeSmallerGivesPositive() {
    math::biginteger bi{1000};
    TS_ASSERT_EQUALS((bi+(-999)).to_string(), "1");
  }
  
  void testSubSelfIsZero() {
    math::biginteger bi{1000};
    TS_ASSERT_EQUALS((bi-bi).to_string(), "0");
  }
  
  void testNegativeMinusNegativeIncreateAbs() {
    math::biginteger bi{-1000};
    TS_ASSERT_EQUALS((bi-100).to_string(), "-1100");
  }
  
  void testSubLargerGivesNegative() {
    math::biginteger bi{1000};
    TS_ASSERT_EQUALS((bi-1001).to_string(), "-1");
  }
  
  void testSubSmallerGivesPositive() {
    math::biginteger bi{1000};
    TS_ASSERT_EQUALS((bi-999).to_string(), "1");
  }
};