refactor: BinaryToHexadecimal (#5331)

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

@@ -1,14 +1,22 @@
 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;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
 
 public class BinaryToHexadecimalTest {
 
-    @Test
-    public void testBinaryToHexadecimal() {
-        assertEquals("6A", BinaryToHexadecimal.binToHex(1101010));
-        assertEquals("C", BinaryToHexadecimal.binToHex(1100));
+    @ParameterizedTest
+    @CsvSource({"0, 0", "1, 1", "10, 2", "1111, F", "1101010, 6A", "1100, C"})
+    void testBinToHex(int binary, String expectedHex) {
+        assertEquals(expectedHex, BinaryToHexadecimal.binToHex(binary));
+    }
+
+    @ParameterizedTest
+    @CsvSource({"2", "1234", "11112"})
+    void testInvalidBinaryInput(int binary) {
+        assertThrows(IllegalArgumentException.class, () -> BinaryToHexadecimal.binToHex(binary));
     }
 }