Top 15 Test Cases for Login Page – Manual & Automation Examples (With Bug Scenarios)

Top 15 Test Cases for Login Page – Manual & Automation Examples (With Bug Scenarios)

Testing a login page is one of the most important tasks in software testing. Whether you’re preparing for a QA interview or writing real-time test cases for your web or mobile application, a login module provides many critical validations. In this post, you’ll learn manual test cases, common bugs, and Selenium automation examples for login functionality.

🔍 Why Login Page Testing Is Important?

• The first point of user interaction with the app
• Security entry point – needs proper validation
• The most common area where users face errors

📝 Top 15 Manual Test Cases for Login Page

Test Case ID	Scenario	Test Steps	Expected Result
TC001	Valid username and password	Enter valid credentials and click Login	The user should be redirected to the dashboard
TC002	Invalid password	Enter a valid username and the wrong password	The error message should appear
TC003	Blank username and password	Leave both fields blank and click Login	Validation messages should be displayed
TC004	Blank username only	Leave the username blank, enter the password, and click Login	The username required message should appear
TC005	Blank password only	Enter username, leave the password blank, click Login	Password required message should appear
TC006	SQL injection attempt	Enter "admin' OR 1=1--" as the username	Input should be rejected and sanitized
TC007	Special characters in the username	Enter special characters like '@#$%'	Error or input validation message should appear
TC008	The password field is masked	Check if the password is displayed as dots or asterisks	Characters should be hidden
TC009	Remember Me checkbox	Select the checkbox and log in	The user should stay logged in on the next visit
TC010	Forgot Password link	Click the link and validate the navigation	The user should go to the reset password screen
TC011	Case sensitivity	Enter uppercase instead of lowercase username	The system should handle case sensitivity properly
TC012	Browser Back button after login	Log in successfully and press the browser back button	The user should not return to the login page or see cached content
TC013	Multiple failed login attempts	Try logging in with the wrong password 5 times	Account lock or CAPTCHA should appear
TC014	Login session timeout	Login and remain idle	The session should expire after the defined timeout
TC015	Mobile responsiveness	Open the login page on mobile devices	The login form should render correctly on smaller screens

🐞 Common Bug Scenarios on Login Page

• Login accepts invalid email or empty credentials
• The password is visible even after clicking the "eye" toggle
• No validation messages for blank fields
• Incorrect redirect after login
• The session has not expired after logging out

🤖 Selenium Automation Example – Valid Login Test

@Test
public void validLoginTest() {
    WebDriver driver = new ChromeDriver();
    driver.get("https://example.com/login");
    
    driver.findElement(By.id("username")).sendKeys("testuser");
    driver.findElement(By.id("password")).sendKeys("testpass");
    driver.findElement(By.id("loginBtn")).click();
    
    String expectedTitle = "Dashboard";
    String actualTitle = driver.getTitle();
    Assert.assertEquals(actualTitle, expectedTitle);

    driver.quit();
}

This Selenium test script verifies a successful login using valid credentials. You can also write negative test cases using invalid passwords and assert error messages.

👋 Hi, I'm Suriya — QA Engineer with 4+ years of experience in manual, API & automation testing.

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