//
//  biginteger_test.cpp
//  bigdecimal
//
//  Created by Sam Jaffe on 5/18/18.
//

#include <gmock/gmock.h>

#include "biginteger.h"

TEST(BigInteger, ModuloZeroThrows) {
  math::biginteger bi{1000};
  EXPECT_THROW(bi%0, std::domain_error);
}

TEST(BigInteger, ModuloBiggerIsSameValue) {
  math::biginteger bi{1000};
  EXPECT_THAT(bi%2000, bi);
}

TEST(BigInteger, ModuloSameNumberIsZero) {
  math::biginteger bi{1000};
  EXPECT_THAT(bi%1000, 0);
}

TEST(BigInteger, ModuloDivisorIsZero) {
  math::biginteger bi{1000};
  EXPECT_THAT(bi%100, 0);
}

TEST(BigInteger, ModuloDiffSignIsInverseElement) {
  math::biginteger bi{1000};
  math::biginteger mod{13};
  EXPECT_THAT((bi%mod)+((-bi)%mod), mod);
}

TEST(BigInteger, ModuloNegativesIsNegative) {
  math::biginteger bi{1000};
  math::biginteger mod{13};
  EXPECT_THAT((bi%mod), -((-bi)%(-mod)));
}