Testing Laravel Rules

DateOrPresent.php

<?php

namespace App\Rules;

use DateTime;
use Illuminate\Contracts\Validation\Rule;
use Illuminate\Validation\Concerns\ValidatesAttributes;

class DateOrPresent implements Rule
{
    use ValidatesAttributes;

    private $sampleDate;

    public $error;

    /**
     * Create a new rule instance.
     */
    public function __construct($dateFormat)
    {
        $this->dateFormat = $dateFormat;
        $this->error = ucfirst(':attribute must be in MMM YYYY (e.g. '.$this->sampleDate.') format or the word present');
    }

    /**
     * Determine if the validation rule passes.
     *
     * @param string $attribute
     * @param mixed  $value
     *
     * @return bool
     */
    public function passes($attribute, $value)
    {
        $this->sampleDate = now()->format($this->dateFormat);

        $date = DateTime::createFromFormat('!'.$this->dateFormat, $value);

        $now = DateTime::createFromFormat('!'.$this->dateFormat, $this->sampleDate);

        if ($date > $now) {
            $this->error = ucfirst(':attribute must not exceed '.ucfirst($this->sampleDate));

            return false;
        }

        if (strtolower($value) === 'present' || ($date && $date->format($this->dateFormat) == $value)) {
            return true;
        }

        return false;
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return $this->error;
    }
}

DateOrPresentTest.php

<?php

namespace Tests\Unit;

use Tests\TestCase;
use App\Rules\DateOrPresent;

class DateOrPresentValidationTest extends TestCase
{
    public function setUp()
    {
        parent::setUp();
    }

    public function test_word_present()
    {
        $rules = [
            'field1' => [new DateOrPresent('M Y')],
        ];

        $data = [
            'field1' => 'present',
        ];

        $v = $this->app['validator']->make($data, $rules);

        $this->assertTrue($v->passes());
    }

    public function test_wrong_date_format()
    {
        $rules = [
            'field1' => [new DateOrPresent('M Y')],
        ];

        $data = [
            'field1' => date('F d Y'),
        ];

        $v = $this->app['validator']->make($data, $rules);

        $this->assertFalse($v->passes());
    }

    public function test_greater_date()
    {
        $rules = [
            'field1' => [new DateOrPresent('M Y')],
        ];

        $data = [
            'field1' => now()->addMonth(1)->format('M Y'),
        ];

        $v = $this->app['validator']->make($data, $rules);

        $this->assertFalse($v->passes());
    }

    public function test_equal_date()
    {
        $rules = [
            'field1' => [new DateOrPresent('M Y')],
        ];

        $data = [
            'field1' => now()->format('M Y'),
        ];

        $v = $this->app['validator']->make($data, $rules);

        $this->assertTrue($v->passes());
    }

    public function test_less_date()
    {
        $rules = [
            'field1' => [new DateOrPresent('M Y')],
        ];

        $data = [
            'field1' => now()->subDay(1)->format('M Y'),
        ];

        $v = $this->app['validator']->make($data, $rules);

        $this->assertTrue($v->passes());
    }
}