refactor: Pow (#5364)

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

@@ -0,0 +1,36 @@
+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));
+    }
+}