Add junit tests for utils classes

src/test/java/stirling/software/SPDF/utils/UrlUtilsTest.java

@@ -0,0 +1,26 @@
+package stirling.software.SPDF.utils;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class UrlUtilsTest {
+
+    @Test
+    void testGetOrigin() {
+        // Mock HttpServletRequest
+        HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
+        Mockito.when(request.getScheme()).thenReturn("http");
+        Mockito.when(request.getServerName()).thenReturn("localhost");
+        Mockito.when(request.getServerPort()).thenReturn(8080);
+        Mockito.when(request.getContextPath()).thenReturn("/myapp");
+
+        // Call the method under test
+        String origin = UrlUtils.getOrigin(request);
+
+        // Assert the result
+        assertEquals("http://localhost:8080/myapp", origin);
+    }
+}