QA Fill tank (uk)

Mate Royal Oil decided to completely automate the refueling process.

Write tests for fillTank function that takes a customer object, fuelPrice 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 {
    maxTankCapacity: 40, // fuel tank volume
    fuelRemains: 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 by discarding number to the tenth part.
• If the poured amount is less than 2 liters, do not pour at all.
• Round the price of the purchased fuel the to the nearest hundredth part.

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