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<?php |
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namespace Kauri\Loan\Test; |
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use Kauri\Loan\PaymentAmountCalculator; |
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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 $amountOfPrincipal |
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* @param $totalPeriod |
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* @param $currentPeriod |
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* @param $yearlyInterestRate |
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* @param $expected |
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*/ |
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public function testGetPaymentAmount( |
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$amountOfPrincipal, |
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$totalPeriod, |
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$currentPeriod, |
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$yearlyInterestRate, |
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$expected |
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) { |
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$presentValue = $amountOfPrincipal; |
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$ratePerPeriod = $yearlyInterestRate / 360 * $currentPeriod; |
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$numberOfPeriods = $totalPeriod / $currentPeriod; |
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$calculator = new PaymentAmountCalculator(); |
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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() |
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{ |
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return [ |
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// Exact |
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[900, 90, 60, 0, 600], |
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[900, 90, 30, 0, 300], |
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[900, 90, 60, 360, 1067.42], |
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[900, 90, 30, 360, 495.56], |
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// Regular, 30 day month, 360 days a year |
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[5630, 1800, 30, 9, 116.87], // 60 payments, monthly, 360 days a year |
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[1000, 60, 30, 0, 500], // 2 payments, monthly, 360 days a year |
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]; |
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} |
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} |
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kaurikk /
loan-amount-calculator
