What are the potential pitfalls of not testing PHP code extensively, particularly in scenarios involving complex calculations like loan durations?

Not testing PHP code extensively, especially in scenarios involving complex calculations like loan durations, can lead to errors that may go unnoticed until they cause significant issues. To mitigate this risk, it is crucial to thoroughly test the code with various input values to ensure its accuracy and reliability. 

// Example PHP code snippet for testing loan duration calculation

function calculateLoanDuration($loanAmount, $interestRate, $monthlyPayment) {
    $months = 0;
    
    while ($loanAmount > 0) {
        $interest = $loanAmount * ($interestRate / 12);
        $loanAmount += $interest - $monthlyPayment;
        $months++;
        
        if ($months > 1000) { // To prevent infinite loops
            break;
        }
    }
    
    return $months;
}

// Test the calculateLoanDuration function with different input values
$loanAmount = 10000;
$interestRate = 0.05;
$monthlyPayment = 500;

echo "Loan duration: " . calculateLoanDuration($loanAmount, $interestRate, $monthlyPayment) . " months";

Keywords

unit testing integration testing regression testing floating point arithmetic precision errors

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