calculate_variance_for_new_joiners.feature

Feature: Calculate Variance

  Assumptions, to keep things simple:
  
  - Payroll period aligned with calendar month
  - Benefit effective date = initiated date
  - No loading on payroll cut-off date
  - No other changes during the month that affect the result
  - Employee gets a cover by default
  - Variance calculation uses calendar months strategy
  
  Background:
    Given the following benefits:
      | Name           | Annual fee |
      | Life assurance | £360       |
    And the payroll cut-off dates are:
      | June 2018 | 2018-06-15 |
      | July 2018 | 2018-07-15 |

  Scenario: Joins on the payroll start date
    Given an employee with a benefit effective date of 2018-06-01 with:
      | Life assurance |
    When the June 2018 payroll report is run
    Then the variance for the employee is £0
  
  Scenario: Joins after payroll start date but before payroll cut-off date
    Given an employee with a benefit effective date of 2018-06-02 with:
      | Life assurance |
    When the June payroll report is run
    Then the variance for the employee is -£1
    
  Scenario: Joins after payroll cut-off date
    
    Variance of £15 is calulated by:
    £1/day x 15 days (from 16th June -> 30th June inclusive)
    
    Given an employee with a benefit effective date of 2018-06-16 with:
      | Life assurance |
    When the July 2018 payroll report is run
    Then the variance for the employee is +£15