User Story Creation Example: Login Page with Password Validation. INVEST model.

### User Story Creation Example: Login Page with Password Validation

#### User Story Title: Secure Login with Password Validation

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#### User Story (Using INVEST Model):

As a registered user,  
I want to log in to my account using a secure password,  
so that my account remains protected from unauthorized access.

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#### Acceptance Criteria:

1. Password Requirements:
   - The password must be exactly 8 characters long.
   - It must include at least:
     - One uppercase letter (A-Z).
     - One lowercase letter (a-z).
     - One numeric character (0-9).
     - One special character (e.g., !, @, #, $, etc.).
   - The password field should mask the input (show as asterisks or dots).

2. Error Messages:
   - If the password is less than 8 characters:  
     "Password must be exactly 8 characters long."
   - If the password does not contain an uppercase letter:  
     "Password must include at least one uppercase letter."
   - If the password does not contain a lowercase letter:  
     "Password must include at least one lowercase letter."
   - If the password does not contain a numeric character:  
     "Password must include at least one number."
   - If the password does not contain a special character:  
     "Password must include at least one special character."

3. Alert Messages:
   - On successful login:  
     "Login successful! Redirecting to your dashboard..."
   - On failed login (invalid credentials):  
     "Invalid username or password. Please try again."

4. Negative Scenarios:
   - User enters a password with 7 characters.
   - User enters a password with no uppercase letter.
   - User enters a password with no special character.
   - User enters a password with no numeric character.
   - User enters a correct password but an incorrect username.
   - User leaves the password field blank.

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#### INVEST Model Breakdown:

1. Independent:  
   The user story is self-contained and does not depend on other stories. It focuses solely on the login functionality with password validation.

2. Negotiable:  
   The specifics of the password requirements (e.g., 8 characters, alphanumeric, etc.) can be discussed and adjusted with stakeholders based on security needs.

3. Valuable:  
   The story provides value to the user by ensuring their account is secure and to the business by reducing the risk of unauthorized access.

4. Estimable:  
   The development team can estimate the effort required to implement password validation, error handling, and alert messages.

5. Small:  
   The story is small enough to be completed within a single sprint. It focuses on a specific feature (password validation) without being overly complex.

6. Testable:  
   The acceptance criteria are clear and testable. Test cases can be written to verify each scenario (e.g., password length, character types, error messages).

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#### Benefits of Using the INVEST Model:

1. Clarity:  
   The INVEST model ensures the user story is clear and understandable for both the development team and stakeholders.

2. Focus on Value:  
   By emphasizing value, the story aligns with user needs and business goals (e.g., security).

3. Feasibility:  
   The story is small and estimable, making it easier to plan and execute within a sprint.

4. Testability:  
   Clear acceptance criteria and negative scenarios make it easy to write test cases and ensure the feature works as expected.

5. Flexibility:  
   The negotiable aspect allows for adjustments based on feedback or changing requirements.

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#### Example Scenario:

Scenario 1: Valid Password  
- Given the user is on the login page,  
- When they enter a valid username and a password that meets all requirements (e.g., "Passw0rd!"),  
- Then they should see the message: "Login successful! Redirecting to your dashboard..."

Scenario 2: Invalid Password (Missing Uppercase Letter)  
- Given the user is on the login page,  
- When they enter a password without an uppercase letter (e.g., "passw0rd!"),  
- Then they should see the error message: "Password must include at least one uppercase letter."

Scenario 3: Invalid Username  
- Given the user is on the login page,  
- When they enter a correct password but an incorrect username,  
- Then they should see the alert message: "Invalid username or password. Please try again."

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This example demonstrates how to create a user story using the INVEST model, ensuring it is clear, valuable, and testable. It also highlights the importance of considering negative scenarios and error handling to deliver a robust feature.

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