import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.FindBy;
import org.openqa.selenium.support.PageFactory;

public class LoginPage {

    WebDriver driver ;

    @FindBy(name="txtUsername")
    WebElement username;

    @FindBy(name="txtPassword")
    WebElement password;

    @FindBy(id="btnLogin")
    WebElement loginButton;

    @FindBy(id="spanMessage")
    WebElement actualErrorMessage;


    public LoginPage(WebDriver driver) {

        this.driver = driver;

        // This initElements method will create all WebElements
        PageFactory.initElements(driver, this);
    }

    public void setUserName(String strUserName) {
        username.sendKeys(strUserName);
    }

    // Set password in password textbox
    public void setPassword(String strPassword) {
        password.sendKeys(strPassword);
    }

    // Click on login button
    public void clickLogin() {
        loginButton.click();
    }

    // Get the error message
    public String getErrorMessage() {
        return actualErrorMessage.getText();
    }

    public void login(String strUserName, String strPasword) {

        // Fill user name
        this.setUserName(strUserName);

        // Fill password
        this.setPassword(strPasword);

        // Click Login button
        this.clickLogin();
    }

}

import io.github.bonigarcia.wdm.WebDriverManager;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.chrome.ChromeOptions;
import static org.junit.jupiter.api.Assertions.assertEquals;

public class NonParameterizedLoginTest  {

    WebDriver driver;
    LoginPage login;

    @BeforeEach
    void setUp() {

        WebDriverManager.chromedriver().setup();
        ChromeOptions chromeOptions = new ChromeOptions();
        driver = new ChromeDriver(chromeOptions);
        driver.manage().window().maximize();
        driver.get("https://opensource-demo.orangehrmlive.com/");

    }

    @Test
    void invalidCredentials1() {

        login = new Login(driver);
        login.login("Admin","Admin");
        String actualErrorMessage = login.getErrorMessage();
        assertEquals("Invalid credentials", actualErrorMessage);

    }

    @Test
    void invalidCredentials2() {

        login = new Login(driver);
        login.login("","Admin");
        String actualErrorMessage = login.getErrorMessage();
        assertEquals("Username cannot be empty", actualErrorMessage);

    }

    @Test
    void invalidCredentials3() {

        login = new Login(driver);
        login.login("Admin","");
        String actualErrorMessage = login.getErrorMessage();
        assertEquals("Password cannot be empty", actualErrorMessage);

    }

    @Test
    void invalidCredentials4() {

        login = new Login(driver);
        login.login("","");
        String actualErrorMessage = login.getErrorMessage();
        assertEquals("Username cannot be empty", actualErrorMessage);

    }


    @AfterEach
    void tearDown() {
        if (driver != null) {
            driver.close();
        }
    }
    
}

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.example</groupId>
    <artifactId>JUnit5Demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
            <version>5.8.2</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>5.8.2</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.seleniumhq.selenium</groupId>
            <artifactId>selenium-java</artifactId>
            <version>3.141.59</version>
        </dependency>

        <dependency>
            <groupId>io.github.bonigarcia</groupId>
            <artifactId>webdrivermanager</artifactId>
            <version>5.1.0</version>
        </dependency>

        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-params</artifactId>
            <version>5.8.2</version>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>3.0.0-M5</version>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>3.0.0-M5</version>

                <dependencies>
                    <dependency>
                        <groupId>org.junit.jupiter</groupId>
                        <artifactId>junit-jupiter-engine</artifactId>
                        <version>5.8.2</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>

</project>

import io.github.bonigarcia.wdm.WebDriverManager;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.CsvFileSource;
import org.junit.jupiter.params.provider.CsvSource;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.chrome.ChromeOptions;
import static org.junit.jupiter.api.Assertions.assertEquals;

public class ParameterizedLoginPageTest {

    WebDriver driver;

    LoginPage loginPage;

    @BeforeEach
     void setUp() {

        WebDriverManager.chromedriver().setup();
        ChromeOptions chromeOptions = new ChromeOptions();
        driver = new ChromeDriver(chromeOptions);
        driver.manage().window().maximize();
        driver.get("https://opensource-demo.orangehrmlive.com/");

    }

    @ParameterizedTest
    @CsvSource({
            "admin123,admin123,Invalid credentials",
            "'',admin123,Username cannot be empty",
            "Admin,'',Password cannot be empty",
            "'','',Username cannot be empty"
    })

    void invalidCredentials1(String username, String password, String errorMessage) {

        loginPage = new LoginPage(driver);
        loginPage.login(username,password);
        String actualErrorMessage = loginPage.getErrorMessage();
        assertEquals(errorMessage, actualErrorMessage);

    }

    @AfterEach
     void tearDown() {
        driver.close();
    }
}

import io.github.bonigarcia.wdm.WebDriverManager;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.CsvFileSource;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.chrome.ChromeOptions;
import static org.junit.jupiter.api.Assertions.assertEquals;

public class ParameterizedLoginPageTest {

    WebDriver driver;

    LoginPage loginPage;

    @BeforeEach
     void setUp() {

        WebDriverManager.chromedriver().setup();
        ChromeOptions chromeOptions = new ChromeOptions();
        driver = new ChromeDriver(chromeOptions);
        driver.manage().window().maximize();
        driver.get("https://opensource-demo.orangehrmlive.com/");

    }

    @ParameterizedTest
    @CsvSource({
            "admin123,admin123,Invalid credentials",
            "'',admin123,Username cannot be empty",
            "Admin,'',Password cannot be empty",
            "'','',Username cannot be empty"
    })


    @ParameterizedTest
    @CsvFileSource(files = "src/test/resources/credentials.csv", numLinesToSkip = 1)
    void invalidCredentials(String username, String password, String errorMessage) {

        loginPage = new LoginPage(driver);
        loginPage.login(username,password);
        String actualErrorMessage = loginPage.getErrorMessage();
        assertEquals(errorMessage, actualErrorMessage);

    }


    @AfterEach
     void tearDown() {
        driver.close();
    }
}