Java/src/test/java/com/thealgorithms/maths/PowTest.java

package com.thealgorithms.maths;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.CsvSource;

public class PowTest {
    @ParameterizedTest
    @CsvSource({"2, 0, 1", "0, 2, 0", "2, 10, 1024", "10, 2, 100", "5, 3, 125", "3, 4, 81"})
    void testPow(int base, int exponent, long expected) {
        assertEquals(expected, Pow.pow(base, exponent), "Failed for base: " + base + " and exponent: " + exponent);
    }

    @Test
    void testPowThrowsExceptionForNegativeExponent() {
        assertThrows(IllegalArgumentException.class, () -> Pow.pow(2, -1));
    }

    @Test
    void testPowHandlesLargeNumbers() {
        assertEquals(1048576, Pow.pow(2, 20));
    }

    @Test
    void testPowHandlesZeroBase() {
        assertEquals(0, Pow.pow(0, 5));
    }

    @Test
    void testPowHandlesOneBase() {
        assertEquals(1, Pow.pow(1, 100));
    }
}