A. GIVEN I have $5000 on my personal account X AND I have $200 on my personal account Y WHEN I transfer $1000 from X to Y THEN I should have balance $4000 on my personal account X AND I should have balance $1200 on my personal account Y

B. GIVEN I have $5000 on my personal account X and $600 on my personal account Y WHEN I transfer
$500 from Y to X
THEN I should have balance $4500 on X and balance $1100 on Y

C. GIVEN I have $5000 on my personal account X WHEN I have $600 on my personal account Y THEN I have $5600 in total on my personal accounts X and Y

D. GIVEN I have $5000 on my personal account X AND I have $200 on my personal account Y WHEN I click 'Make transfer' button AND I enter '3000' into 'Amount' field AND I enter 'X' into 'From which account' field AND I enter 'Y' into 'To which account' field AND I click 'Confirm transaction' button THEN I should have balance $2000 on my personal account X AND I should have balance $3200 on my personal account Y