Add example Selenium test classes

nodel-jyhost/src/test/java/org/nodel/ActiveNavItemSeleniumTest.java

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+package org.nodel;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.Test;
+import org.openqa.selenium.By;
+import org.openqa.selenium.WebDriver;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ActiveNavItemSeleniumTest {
+
+    @Test
+    public void testActiveNavigationItem() {
+        WebDriver driver = WebDriverSingleton.getDriver();
+        driver.get("http://127.0.0.1:8085");
+        String activeNavItemText = driver.findElement(By.cssSelector(".nav.navbar-nav .active")).getText();
+        assertEquals("Locals", activeNavItemText, "Active navigation item should be 'Locals'");
+    }
+}

nodel-jyhost/src/test/java/org/nodel/NavigationSeleniumTest.java

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+package org.nodel;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.Test;
+import org.openqa.selenium.By;
+import org.openqa.selenium.WebDriver;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+public class NavigationSeleniumTest {
+
+    @Test
+    public void testNavigationBarPresence() {
+        WebDriver driver = WebDriverSingleton.getDriver();
+        driver.get("http://127.0.0.1:8085");
+        assertNotNull(driver.findElement(By.cssSelector(".navbar")), "Navigation bar should be present");
+    }
+}

nodel-jyhost/src/test/java/org/nodel/WebDriverSingleton.java

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+package org.nodel;
+
+import org.openqa.selenium.WebDriver;
+import org.openqa.selenium.chrome.ChromeDriver;
+import org.openqa.selenium.chrome.ChromeOptions;
+import java.util.concurrent.TimeUnit;
+
+public class WebDriverSingleton {
+    private static WebDriver driver = null;
+
+    private WebDriverSingleton() {}
+
+    public static WebDriver getDriver() {
+        if (driver == null) {
+            ChromeOptions options = new ChromeOptions();
+            options.addArguments("--remote-allow-origins=*");
+            driver = new ChromeDriver(options);
+            driver.manage().timeouts().pageLoadTimeout(30, TimeUnit.SECONDS);
+        }
+        return driver;
+    }
+
+    public static void quitDriver() {
+        if (driver != null) {
+            driver.quit();
+            driver = null;
+        }
+    }
+}