Feature: Tracker Creation Function
  As a developer
  I want to create trackers easily
  So that I can use them consistently

  Scenario: Create tracker with all parameters
    Given a temporary credentials directory
    Given valid service account credentials
    And a valid spreadsheet ID
    When I call create_tracker with all parameters
    Then the tracker should be created successfully

  Scenario: Create tracker without spreadsheet ID
    Given a temporary credentials directory
    When I call create_tracker without spreadsheet ID
    Then the tracker should be None

  Scenario: Create tracker with authentication failure
    Given a temporary credentials directory
    Given invalid service account credentials
    And a valid spreadsheet ID
    When I call create_tracker with credentials path
    Then the tracker should be None

  Scenario: Create tracker with custom worksheet name
    Given a temporary credentials directory
    Given valid service account credentials
    And a valid spreadsheet ID
    And a custom worksheet name "CustomSheet"
    When I call create_tracker with worksheet name
    Then the tracker should use the custom worksheet

  Scenario: Create tracker when authenticate method raises exception
    Given a temporary credentials directory
    Given credentials that cause authentication to raise exception
    And a valid spreadsheet ID
    When I call create_tracker with these credentials
    Then create_tracker should handle the exception
    And return None