Prepare a test plan. The test plan must;

# Test Plan

## I. What Needs to Be Tested
The following functionalities and features of the application need to be tested:

1. **User Registration**
- Valid registration with correct data.
- Invalid registration with missing or incorrect data.

2. **User Login**
- Successful login with valid credentials.
- Failed login with incorrect credentials.
- Password recovery functionality.

3. **Profile Management**
- Update profile information.
- Change password.

4. **Data Retrieval**
- Fetch user-specific data.
- Ensure data accuracy and correctness.

5. **Payment Processing**
- Test successful transactions.
- Test declined transactions with insufficient funds.
- Verify transaction history updates.

6. **Search Functionality**
- Test search with valid keywords.
- Test search with no results.

7. **Error Handling**
- Test application behavior with server downtime.
- Test application behavior with invalid input.

## II. Test Scenarios and Test Data

### 1. User Registration

| Test Scenario | Test Data |
|---------------------------------------|--------------------------------------|
| Valid User Registration | Name: John Doe, Email: john, Password: ValidPass123 |
| Incomplete Registration Form | Name: John Doe, Email: <empty>, Password: ValidPass123 |
| Invalid Email Format | Name: John Doe, Email: invalidEmail, Password: ValidPass123 |

### 2. User Login

| Test Scenario | Test Data |
|---------------------------------------|--------------------------------------|
| Valid Login | Email: john, Password: ValidPass123 |
| Invalid Credentials | Email: john, Password: InvalidPass |
| Password Recovery | Email: john |

### 3. Profile Management

| Test Scenario | Test Data |
|---------------------------------------|--------------------------------------|
| Update Profile | Name: John Updated, Email: john.updated |
| Change Password | Old Password: ValidPass123, New Password: NewValidPass123 |

### 4. Data Retrieval

| Test Scenario | Test Data |
|---------------------------------------|--------------------------------------|
| Retrieve User Data | User ID: 1 |

### 5. Payment Processing

| Test Scenario | Test Data |
|---------------------------------------|--------------------------------------|
| Successful Payment | Card Number: 4111 1111 1111 1111, Expiry: 12/25, CVV: 123 |
| Failed Payment (Insufficient Funds) | Card Number: 4000 0000 0000 9995, Expiry: 12/25, CVV: 123 |

### 6. Search Functionality

| Test Scenario | Test Data |
|---------------------------------------|--------------------------------------|
| Valid Search | Keyword: "Test Product" |
| No Results Search | Keyword: "NonExistentProduct123" |

### 7. Error Handling

| Test Scenario | Test Data |
|---------------------------------------|--------------------------------------|
| Application Downtime | Simulate server downtime |
| Invalid Input | Enter special characters in a text field |

## III. Expected Outcomes for Each Scenario Prepared

### 1. User Registration
- **Valid Registration**: User should be successfully registered and redirected to the login page.
- **Incomplete Registration**: System should display an error message indicating required fields.
- **Invalid Email Format**: System should display an error message regarding invalid email.

### 2. User Login
- **Valid Login**: User should be successfully logged in and redirected to the dashboard.
- **Invalid Credentials**: System should display an error message indicating incorrect credentials.
- **Password Recovery**: An email with password reset instructions should be sent.

### 3. Profile Management
- **Profile Update**: User profile should be updated successfully without errors.
- **Change Password**: Password should be changed successfully and require a login with the new password.

### 4. Data Retrieval
- **Retrieve User Data**: User-specific data should be accurately fetched from the database.

### 5. Payment Processing
- **Successful Payment**: Transaction should be approved, and order confirmation should be displayed.
- **Failed Payment**: System should display a message indicating insufficient funds.

### 6. Search Functionality
- **Valid Search**: The system should return relevant products.
- **No Results Search**: System should display a message indicating no products found.

### 7. Error Handling
- **Application Downtime**: System should show an error message that the application is currently down.
- **Invalid Input**: System should display an error message indicating invalid input format.

### Conclusion
This test plan outlines the key functionalities to be tested, the scenarios and the expected outcomes. It's critical that both manual and automated testing approaches are utilized to ensure comprehensive coverage and minimize the risk of defects.