ldc-boutique-cnc-sable/tests/Unit/Domain/Enums/TaxRateTest.php

<?php

declare(strict_types=1);

namespace Tests\Unit\Domain\Enums;

use Domain\Enums\TaxRate;
use Money\Currency;
use Money\Money;

describe('TaxRateEnum', function () {
    it('returns correct percent', function () {
        // GIVEN
        $tax20 = TaxRate::TVA_20;
        $tax55 = TaxRate::TVA_5_5;

        // WHEN
        $percent20 = $tax20->percent();
        $percent55 = $tax55->percent();

        // THEN
        expect($percent20)->toBe(20.0)
            ->and($percent55)->toBe(5.5);
    });

    it('returns correct rate', function () {
        // GIVEN
        $tax20 = TaxRate::TVA_20;
        $tax55 = TaxRate::TVA_5_5;

        // WHEN
        $rate20 = $tax20->rate();
        $rate55 = $tax55->rate();

        // THEN
        expect($rate20)->toBe(0.2)
            ->and($rate55)->toBe(0.055);
    });

    it('applies tax correctly to money', function () {
        // GIVEN
        $price = new Money(10000, new Currency('EUR')); // 100.00 EUR
        $tax20 = TaxRate::TVA_20;
        $tax55 = TaxRate::TVA_5_5;

        // WHEN
        $amountWithTax20 = $tax20->applyTo($price)->getAmount();
        $amountWithTax55 = $tax55->applyTo($price)->getAmount();

        // THEN
        expect($amountWithTax20)->toBe('12000') // 120.00 EUR
            ->and($amountWithTax55)->toBe('10550'); // 105.50 EUR
    });

    it('creates TaxRate from percent with float, int, or string', function () {
        // GIVEN
        $int20   = 20;
        $float20 = 20.0;
        $float55 = 5.5;

        // WHEN
        $rateFromInt     = TaxRate::fromPercent($int20);
        $rateFromFloat20 = TaxRate::fromPercent($float20);
        $rateFromFloat55 = TaxRate::fromPercent($float55);

        // THEN
        expect($rateFromInt)->toBe(TaxRate::TVA_20)
            ->and($rateFromFloat20)->toBe(TaxRate::TVA_20)
            ->and($rateFromFloat55)->toBe(TaxRate::TVA_5_5);
    });

    it('creates TaxRate from enum value fallback', function () {
        // GIVEN
        $val1 = 1;
        $val2 = 2;

        // WHEN
        $rate1 = TaxRate::fromPercent($val1);
        $rate2 = TaxRate::fromPercent($val2);

        // THEN
        expect($rate1)->toBe(TaxRate::TVA_20)
            ->and($rate2)->toBe(TaxRate::TVA_5_5);
    });

    it('throws when percent is not numeric', function () {
        // GIVEN
        $invalid = 0.8;

        // WHEN / THEN
        expect(fn () => TaxRate::fromPercent($invalid))
            ->toThrow(\UnexpectedValueException::class, 'Unhandled tax rate: 0.8');
    });

    it('throws when percent is unhandled', function () {
        // GIVEN
        $unhandled = 10.0;

        // WHEN / THEN
        expect(fn () => TaxRate::fromPercent($unhandled))
            ->toThrow(\UnexpectedValueException::class, 'Unhandled tax rate: 10');
    });
});