TEST TYPE: dashboard_functional

Here are the functional test cases based on the task description regarding the invoice description change:

---

**Title:** TC_FUNC_001_Validate_Invoice_Description_Change  
**Scenario:** Verify that the invoice description is updated correctly for both advance and basic telematics.  
**Preconditions:** User is logged in with permission to view invoices.  
**Steps to Reproduce:**  
1. Navigate to the dashboard.  
2. Select the "Invoices" section.  
3. Locate an invoice with the previous description.  
4. Change the top line to "Advance Telematics" and the bottom line to "Basic Telematics".  
5. Save the changes.  
6. Refresh the invoice list.  
**Expected Result:** The invoice description should display "Advance Telematics" on the top line and "Basic Telematics" on the bottom line.  
**Actual Result:** To be filled during execution.  
**Priority:** High  
**Test Data:** Existing invoice with previous descriptions.

---

**Title:** TC_FUNC_002_Validate_Invoice_Description_Unauthorized_User  
**Scenario:** Verify that unauthorized users cannot change invoice descriptions.  
**Preconditions:** User is logged in without permission to edit invoices.  
**Steps to Reproduce:**  
1. Navigate to the dashboard.  
2. Select the "Invoices" section.  
3. Attempt to edit an invoice description.  
**Expected Result:** The system should display an error message indicating insufficient permissions to edit the invoice.  
**Actual Result:** To be filled during execution.  
**Priority:** High  
**Test Data:** User account without edit permissions.

---

**Title:** TC_FUNC_003_Validate_Invoice_Description_Empty_Fields  
**Scenario:** Verify system behavior when attempting to save an invoice with empty description fields.  
**Preconditions:** User is logged in with permission to edit invoices.  
**Steps to Reproduce:**  
1. Navigate to the dashboard.  
2. Select the "Invoices" section.  
3. Locate an invoice and attempt to clear both description fields.  
4. Save the changes.  
**Expected Result:** The system should display a validation error indicating that description fields cannot be empty.  
**Actual Result:** To be filled during execution.  
**Priority:** Medium  
**Test Data:** Existing invoice with descriptions.

---

**Title:** TC_FUNC_004_Validate_Invoice_Description_Special_Characters  
**Scenario:** Verify that the system handles special characters in invoice descriptions correctly.  
**Preconditions:** User is logged in with permission to edit invoices.  
**Steps to Reproduce:**  
1. Navigate to the dashboard.  
2. Select the "Invoices" section.  
3. Edit an invoice description to include special characters (e.g., @, #, $, %, ^).  
4. Save the changes.  
**Expected Result:** The system should accept the special characters and display them correctly in the invoice description.  
**Actual Result:** To be filled during execution.  
**Priority:** Medium  
**Test Data:** Existing invoice with valid descriptions.

---

**Title:** TC_FUNC_005_Validate_Invoice_Description_Character_Limit  
**Scenario:** Verify that the system enforces character limits for invoice descriptions.  
**Preconditions:** User is logged in with permission to edit invoices.  
**Steps to Reproduce:**  
1. Navigate to the dashboard.  
2. Select the "Invoices" section.  
3. Attempt to enter a description exceeding the maximum character limit (e.g., 256 characters).  
4. Save the changes.  
**Expected Result:** The system should display a validation error indicating that the description exceeds the character limit.  
**Actual Result:** To be filled during execution.  
**Priority:** Medium  
**Test Data:** Existing invoice with valid descriptions.

---

**Title:** TC_FUNC_006_Validate_Invoice_Description_Audit_Log  
**Scenario:** Verify that changes to invoice descriptions are logged in the audit trail.  
**Preconditions:** User is logged in with permission to edit invoices.  
**Steps to Reproduce:**  
1. Navigate to the dashboard.  
2. Select the "Invoices" section.  
3. Edit an invoice description and save changes.  
4. Access the audit log section.  
**Expected Result:** The audit log should reflect the changes made to the invoice description, including the user who made the change and the timestamp.  
**Actual Result:** To be filled during execution.  
**Priority:** Medium  
**Test Data:** Existing invoice with previous descriptions.

---

**Title:** TC_FUNC_007_Validate_Invoice_Description_Change_Notification  
**Scenario:** Verify that users receive notifications when invoice descriptions are changed.  
**Preconditions:** User is logged in with permission to edit invoices.  
**Steps to Reproduce:**  
1. Navigate to the dashboard.  
2. Select the "Invoices" section.  
3. Edit an invoice description and save changes.  
4. Check the notifications section.  
**Expected Result:** The user should receive a notification confirming the successful update of the invoice description.  
**Actual Result:** To be filled during execution.  
**Priority:** Medium  
**Test Data:** Existing invoice with previous descriptions.

---

**Title:** TC_FUNC_008_Validate_Invoice_Description_Change_Impact  
**Scenario:** Verify that changing the invoice description does not affect other invoice functionalities.  
**Preconditions:** User is logged in with permission to edit invoices.  
**Steps to Reproduce:**  
1. Navigate to the dashboard.  
2. Select the "Invoices" section.  
3. Edit an invoice description and save changes.  
4. Attempt to perform other actions (e.g., download, print, email the invoice).  
**Expected Result:** All other invoice functionalities should work as expected without any errors.  
**Actual Result:** To be filled during execution.  
**Priority:** Medium  
**Test Data:** Existing invoice with previous descriptions.

---

**Title:** TC_FUNC_009_Validate_Invoice_Description_Change_Concurrency  
**Scenario:** Verify system behavior when multiple users attempt to change the same invoice description simultaneously.  
**Preconditions:** Multiple users are logged in with permission to edit invoices.  
**Steps to Reproduce:**  
1. User A navigates to the dashboard and selects an invoice to edit.  
2. User B does the same with the same invoice.  
3. Both users attempt to change the description and save changes.  
**Expected Result:** The system should handle concurrency gracefully, either allowing one change and notifying the other user or merging changes appropriately.  
**Actual Result:** To be filled during execution.  
**Priority:** High  
**Test Data:** Existing invoice with previous descriptions.

---

**Title:** TC_FUNC_010_Validate_Invoice_Description_Change_Responsiveness  
**Scenario:** Verify that the invoice description change functionality is responsive across different devices.  
**Preconditions:** User is logged in with permission to edit invoices.  
**Steps to Reproduce:**  
1. Access the dashboard from a mobile device.  
2. Navigate to the "Invoices" section.  
3. Edit an invoice description and save changes.  
4. Access the dashboard from a desktop.  
5. Check the updated invoice description.  
**Expected Result:** The invoice description should be updated correctly on both mobile and desktop devices.  
**Actual Result:** To be filled during execution.  
**Priority:** Medium  
**Test Data:** Existing invoice with previous descriptions.

---

These test cases cover a range of scenarios related to the functional aspect of changing invoice descriptions, ensuring thorough testing of the new feature while considering various user roles, permissions, and potential edge cases.