test: Add test to verify implementation of reverse integer method.

JavaDsaWithTest/src/test/java/org/practice/dsa/leet_code/ReverseIntegerTest.java

@@ -0,0 +1,17 @@
+package org.practice.dsa.leet_code;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ReverseIntegerTest {
+    private final QuestionReverseInteger reverseInteger = new QuestionReverseInteger();
+
+    @Test
+    public void testReverseInteger() {
+        int input = 123;
+        int expected = 321;
+        int actual = reverseInteger.reverse(input);
+        assertEquals(expected, actual);
+    }
+}