• Read the guideline before start

Mate Royal Oil decided to completely automate the refueling process.

Write tests for fill_tank function that takes a customer dict, fuel_price per 1 liter and amount of fuel the customer wants to buy.

customer object contains the next props:

customer = {
  "money": 3000, // customer account balance
  "vehicle": {
    "max_tank_capacity": 40, // fuel tank volume
    "fuel_remains": 8, // Remaining fuel in the tank
  }
}

The function should return nothing, but only refills fuel and withdraws money, following the next rules:

• If the amount is not given, then full tank is ordered.
• If the amount is greater than the tank can accommodate, pour only what will fit.
• ALWAYS fill in only what the client can pay.
• Round the poured amount to 1 decimal.
• If the poured amount is less than 2 liters, do not pour at all.
• Round the price of the purchased fuel the to 2 decimals.