FibonacciLoopTest.java

packagecom.thealgorithms.maths;

importstaticorg.junit.jupiter.api.Assertions.assertEquals;
importstaticorg.junit.jupiter.api.Assertions.assertThrows;

importjava.math.BigInteger;
importorg.junit.jupiter.api.Test;

publicclassFibonacciLoopTest {
@Test
publicvoidcheckValueAtZero() {
assertEquals(BigInteger.ZERO, FibonacciLoop.compute(0));
 }

@Test
publicvoidcheckValueAtOne() {
assertEquals(BigInteger.ONE, FibonacciLoop.compute(1));
 }

@Test
publicvoidcheckValueAtTwo() {
assertEquals(BigInteger.ONE, FibonacciLoop.compute(2));
 }

@Test
publicvoidcheckRecurrenceRelation() {
for (inti = 0; i < 100; ++i) {
assertEquals(FibonacciLoop.compute(i + 2), FibonacciLoop.compute(i + 1).add(FibonacciLoop.compute(i)));
 }
 }

@Test
publicvoidcheckNegativeInput() {
assertThrows(IllegalArgumentException.class, () -> { FibonacciLoop.compute(-1); });
 }
}