Top 20 Test Cases for Common Web Applications – Login, Signup, Cart, Payment

1. Login Module – Test Cases

#	Test Scenario	Test Steps	Expected Result	Type
1	Log in with valid credentials	Enter a valid email and password, and click Login	User is logged in and dashboard is shown	Positive
2	Login with invalid password	Enter valid email and wrong password, click Login	Error message is shown	Negative
3	Login with empty fields	Click Login without entering any data	Validation messages are displayed	Negative
4	Remember Me functionality	Check "Remember Me", login, logout, revisit login page	Email should be pre-filled	Positive
5	Forgot password link	Click "Forgot Password", enter email	Password reset link is sent	Positive

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📝 2. Signup Module – Test Cases

#	Test Scenario	Test Steps	Expected Result	Type
6	Signup with valid details	Fill form with valid data and submit	Account is created successfully	Positive
7	Email already registered	Enter an already used email and submit	Error: Email already exists	Negative
8	Signup with weak password	Enter a password like "123"	Error: Weak password warning	Negative
9	Password and Confirm Password mismatch	Enter different passwords	Error: Passwords do not match	Negative
10	Signup without accepting terms	Leave "Terms & Conditions" unchecked and submit	Error: Must accept terms	Negative

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🛒 3. Shopping Cart – Test Cases

#	Test Scenario	Test Steps	Expected Result	Type
11	Add product to cart	Click "Add to Cart" on a product	Product appears in cart	Positive
12	Remove product from cart	Click "Remove" in cart page	Product is removed	Positive
13	Change product quantity	Increase quantity from 1 to 3	Total price updates correctly	Positive
14	Cart total calculation	Add multiple products, verify total	Cart total is correct	Positive
15	Checkout with empty cart	Click checkout without any items	Warning: Cart is empty	Negative

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💳 4. Payment Module – Test Cases

#	Test Scenario	Test Steps	Expected Result	Type
16	Payment with valid card	Enter valid card details and click Pay	Payment successful message	Positive
17	Payment with invalid card number	Enter fake card number	Error: Invalid card	Negative
18	Payment with expired card	Enter an expired card	Error: Card expired	Negative
19	Payment network failure	Simulate network loss during payment	Transaction failed, retry option shown	Negative
20	Redirect after payment	Complete payment	User is redirected to order confirmation	Positive

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📌 Summary

• Login & Signup: Focus on security and validation
• Cart: Focus on calculations and user actions
• Payment: Focus on edge cases, failures, and redirects