unsupervised-scheduler/tests/Unit/Payment/PaymentDueMailerTest.php

<?php
declare(strict_types=1);

namespace Unsupervised\Schedular\Tests\Unit\Payment;

use Brain\Monkey\Functions;
use Mockery;
use Unsupervised\Schedular\Payment\PaymentDueMailer;
use Unsupervised\Schedular\Tests\Unit\TestCase;

class PaymentDueMailerTest extends TestCase
{
    private function student(string $email): \WP_User
    {
        $student             = Mockery::mock(\WP_User::class);
        $student->user_email = $email;

        return $student;
    }

    public function testReturnsFalseWithoutRecipient(): void
    {
        $items = [[ 'label' => 'x', 'amount' => 10.0, 'currency' => 'CAD', 'due_date' => '2026-07-14', 'etransfer_email' => null ]];

        self::assertFalse((new PaymentDueMailer())->send($this->student(''), $items));
    }

    public function testReturnsFalseWithNoItems(): void
    {
        self::assertFalse((new PaymentDueMailer())->send($this->student('[email protected]'), []));
    }

    public function testConsolidatesItemsWithGrandTotal(): void
    {
        Functions\expect('wp_mail')
            ->once()
            ->with(
                '[email protected]',
                Mockery::type('string'),
                Mockery::on(static function (string $body): bool {
                    return str_contains($body, 'Piano')
                        && str_contains($body, 'Jul 15, 2026')
                        && str_contains($body, 'Guitar')
                        && str_contains($body, 'Jul 22, 2026')
                        && str_contains($body, '35.00')
                        && str_contains($body, '40.00')
                        // 35 + 40 grand total
                        && str_contains($body, '75.00');
                })
            )
            ->andReturn(true);

        $items = [
            [ 'label' => 'Piano', 'amount' => 35.0, 'currency' => 'CAD', 'due_date' => '2026-07-15', 'etransfer_email' => null ],
            [ 'label' => 'Guitar', 'amount' => 40.0, 'currency' => 'CAD', 'due_date' => '2026-07-22', 'etransfer_email' => null ],
        ];

        self::assertTrue((new PaymentDueMailer())->send($this->student('[email protected]'), $items));
    }

    public function testIncludesReferenceWhenProvided(): void
    {
        Functions\expect('wp_mail')
            ->once()
            ->with(
                '[email protected]',
                Mockery::type('string'),
                Mockery::on(static fn (string $body): bool => str_contains($body, 'REF12345'))
            )
            ->andReturn(true);

        $items = [[ 'label' => 'Piano', 'amount' => 35.0, 'currency' => 'CAD', 'due_date' => '2026-07-15', 'etransfer_email' => null ]];

        self::assertTrue((new PaymentDueMailer())->send($this->student('[email protected]'), $items, 'REF12345'));
    }

    public function testCreditReducesTheTotalDue(): void
    {
        Functions\expect('wp_mail')
            ->once()
            ->with(
                '[email protected]',
                Mockery::type('string'),
                Mockery::on(static function (string $body): bool {
                    // Line shows the full 35.00; credit line shows -20.00; total due 15.00.
                    return str_contains($body, '35.00')
                        && str_contains($body, '-CAD 20.00')
                        && str_contains($body, 'Total due: CAD 15.00');
                })
            )
            ->andReturn(true);

        $items = [[ 'label' => 'Piano', 'amount' => 35.0, 'currency' => 'CAD', 'due_date' => '2026-07-15', 'etransfer_email' => '[email protected]' ]];

        self::assertTrue((new PaymentDueMailer())->send($this->student('[email protected]'), $items, 'REF1', 20.0));
    }

    public function testCreditCoveringEverythingLeavesZeroDueAndNoEtransferLine(): void
    {
        Functions\expect('wp_mail')
            ->once()
            ->with(
                '[email protected]',
                Mockery::type('string'),
                Mockery::on(static function (string $body): bool {
                    return str_contains($body, 'Total due: CAD 0.00')
                        && ! str_contains($body, '[email protected]');
                })
            )
            ->andReturn(true);

        $items = [[ 'label' => 'Piano', 'amount' => 35.0, 'currency' => 'CAD', 'due_date' => '2026-07-15', 'etransfer_email' => '[email protected]' ]];

        self::assertTrue((new PaymentDueMailer())->send($this->student('[email protected]'), $items, '', 35.0));
    }

    public function testIncludesEtransferDestination(): void
    {
        Functions\expect('wp_mail')
            ->once()
            ->with(
                '[email protected]',
                Mockery::type('string'),
                Mockery::on(static fn (string $body): bool => str_contains($body, '[email protected]'))
            )
            ->andReturn(true);

        $items = [[ 'label' => 'Piano', 'amount' => 35.0, 'currency' => 'CAD', 'due_date' => '2026-07-15', 'etransfer_email' => '[email protected]' ]];

        self::assertTrue((new PaymentDueMailer())->send($this->student('[email protected]'), $items));
    }
}