Enhance docs, remove main, add tests in AnytoAny (#5916)

src/test/java/com/thealgorithms/conversions/AnytoAnyTest.java

@@ -0,0 +1,48 @@
+package com.thealgorithms.conversions;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.junit.jupiter.api.Test;
+
+public class AnytoAnyTest {
+
+    @Test
+    void testValidConversions() {
+        assertEquals(101, AnytoAny.convertBase(5, 10, 2), "Decimal 5 should convert to binary 101");
+        assertEquals(2, AnytoAny.convertBase(2, 2, 10), "Binary 10 should convert to decimal 2");
+        assertEquals(6, AnytoAny.convertBase(110, 2, 8), "Binary 110 should convert to octal 6");
+        assertEquals(111, AnytoAny.convertBase(7, 10, 2), "Decimal 7 should convert to binary 111");
+    }
+
+    @Test
+    void testDecimalToBinary() {
+        assertEquals(1101, AnytoAny.convertBase(13, 10, 2), "Decimal 13 should convert to binary 1101");
+        assertEquals(0, AnytoAny.convertBase(0, 10, 2), "Decimal 0 should convert to binary 0");
+    }
+
+    @Test
+    void testBinaryToDecimal() {
+        assertEquals(13, AnytoAny.convertBase(1101, 2, 10), "Binary 1101 should convert to decimal 13");
+        assertEquals(0, AnytoAny.convertBase(0, 2, 10), "Binary 0 should convert to decimal 0");
+    }
+
+    @Test
+    void testOctalToDecimal() {
+        assertEquals(8, AnytoAny.convertBase(10, 8, 10), "Octal 10 should convert to decimal 8");
+        assertEquals(65, AnytoAny.convertBase(101, 8, 10), "Octal 101 should convert to decimal 65");
+    }
+
+    @Test
+    void testInvalidBases() {
+        assertThrows(IllegalArgumentException.class, () -> AnytoAny.convertBase(5, 1, 10), "Source base less than 2 should throw IllegalArgumentException");
+
+        assertThrows(IllegalArgumentException.class, () -> AnytoAny.convertBase(5, 10, 11), "Destination base greater than 10 should throw IllegalArgumentException");
+    }
+
+    @Test
+    void testLargeNumberConversion() {
+        assertEquals(1111101000, AnytoAny.convertBase(1000, 10, 2), "Decimal 1000 should convert to binary 1111101000");
+        assertEquals(1750, AnytoAny.convertBase(1000, 10, 8), "Decimal 1000 should convert to octal 1750");
+    }
+}