Add MoveHash test cases

Author: ShyamChavda005

src/test/java/com/thealgorithms/twopointer/MoveHashTest.java

@@ -0,0 +1,23 @@
+package com.thealgorithms.twopointer;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class MoveHashTest {
+
+    @Test
+    void testMoveHash() {
+        assertEquals("hello#####", MoveHash.movehashtoend("h#e#l###l#o"));
+    }
+
+    @Test
+    void testEmpty() {
+        assertEquals("", MoveHash.movehashtoend(""));
+    }
+
+    @Test
+    void testNull() {
+        assertEquals(null, MoveHash.movehashtoend(null));
+    }
+}