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<?php |
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namespace Kauri\Loan\Test; |
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use Kauri\Loan\PaymentAmountCalculator\AnnuityPaymentAmountCalculator; |
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use Kauri\Loan\PaymentAmountCalculator\EqualPrincipalPaymentAmountCalculator; |
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use Kauri\Loan\PaymentAmountCalculatorInterface; |
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use PHPUnit\Framework\TestCase; |
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class PaymentAmountCalculatorTest extends TestCase |
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{ |
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/** |
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* @dataProvider loanData |
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* @param $presentValue |
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* @param $yearlyInterestRate |
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* @param $totalPeriod |
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* @param $currentPeriod |
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* @param $expected |
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* @param PaymentAmountCalculatorInterface $calculator |
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*/ |
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public function testGetPaymentAmount( |
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$presentValue, |
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$yearlyInterestRate, |
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$totalPeriod, |
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$currentPeriod, |
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$expected, |
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PaymentAmountCalculatorInterface $calculator |
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) { |
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$ratePerPeriod = $yearlyInterestRate / 360 * $currentPeriod; |
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$numberOfPeriods = $totalPeriod / $currentPeriod; |
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$paymentAmount = $calculator->getPaymentAmount($presentValue, $ratePerPeriod, $numberOfPeriods); |
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$this->assertEquals($expected, round($paymentAmount, 2)); |
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} |
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/** |
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* @return array |
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*/ |
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public function loanData(): array |
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{ |
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$annuityCalculator = new AnnuityPaymentAmountCalculator(); |
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$equalCalculator = new EqualPrincipalPaymentAmountCalculator(); |
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return [ |
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// Exact |
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[900, 0, 90, 60, 600, $annuityCalculator], |
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[900, 0, 90, 30, 300, $annuityCalculator], |
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[300, 0, 30, 30, 300, $annuityCalculator], |
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[900, 360, 90, 60, 1067.42, $annuityCalculator], |
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[900, 360, 90, 30, 495.56, $annuityCalculator], |
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[674.43, 360, 60, 30, 495.56, $annuityCalculator], |
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[381.20, 360, 30, 30, 495.56, $annuityCalculator], |
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// Regular, 30 day month, 360 days a year |
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[5630, 9, 1800, 30, 116.87, $annuityCalculator], // 60 payments, monthly, 360 days a year |
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[1000, 0, 60, 30, 500, $annuityCalculator], // 2 payments, monthly, 360 days a year |
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[900, 0, 90, 30, 300, $equalCalculator], |
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[600, 0, 60, 30, 300, $equalCalculator], |
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[900, 360, 90, 30, 570, $equalCalculator], |
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[600, 360, 60, 30, 480, $equalCalculator], |
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[300, 360, 30, 30, 390, $equalCalculator] |
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]; |
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} |
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} |
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kaurikk /
loan-amount-calculator
