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package com.others;

import org.junit.jupiter.api.Assertions;

import org.junit.jupiter.api.Test;

import java.math.BigInteger;

class FastPowerTest {

private void testLong(long n, long k, long m) {

long result = FastPower.calculate(n, k, m);

Assertions.assertEquals(result, BigInteger.valueOf(n).modPow(BigInteger.valueOf(k), BigInteger.valueOf(m)).longValue());

}

private void testBigInteger(BigInteger n, BigInteger k, BigInteger m) {

BigInteger result = FastPower.calculate(n, k, m);

Assertions.assertEquals(result, n.modPow(k, m));

}

@Test

void test() {

testLong(2, 2, 10);

testLong(100, 1000, 20);

testLong(123456, 123456789, 234);

testBigInteger(BigInteger.TEN, BigInteger.TEN, BigInteger.valueOf(4));

testBigInteger(new BigInteger("123456"), new BigInteger("123456789"), new BigInteger("234"));

testBigInteger(new BigInteger("123456789101112"), new BigInteger("12345678910111213"), new BigInteger("567890"));

}

}