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<?php

use PHPUnit\Framework\TestCase;

class FoolCategory {

    protected $name;

    function __construct($name)
    {
        $this->name = $name;
    }

    function get_label()
    {
        return $this->name;
    }
}

class FoolItem
{
    protected $categories;

    function __construct($categories)
    {
        foreach ($categories as $c)
            $this->categories[] = new FoolCategory($c);
    }

    function get_categories() {
        return $this->categories;
    }
}

class PlanetTest extends TestCase
{

    protected $planet;
    protected $items;

    public function setUp() : void
    {
        $this->planet = new Planet();

        $this->items = array(
            new FoolItem(array('catA', 'catB', 'catC')),
            new FoolItem(array('catB')),
            new FoolItem(array('catA')),
            new FoolItem(array('catC'))
        );
    }

    protected function _after()
    {
        unset($this->planet);
    }

    public function testFilterItemsByCategoryWithInvalidCategory()
    {
        $this->assertEquals(count($this->planet->_filterItemsByCategory($this->items, null)), count($this->items));
        $this->assertEquals(count($this->planet->_filterItemsByCategory($this->items, ' ')), count($this->items));
    }

    public function testFilterItemsByCategoryWithNonUsedCategory()
    {
        $this->assertEquals(count($this->planet->_filterItemsByCategory($this->items, 'catD')), 0);
    }

    public function testFilterItemsByCategoryWithValidCategory()
    {
        $this->assertEquals(count($this->planet->_filterItemsByCategory($this->items, 'catA')), 2);
        $this->assertEquals(count($this->planet->_filterItemsByCategory($this->items, 'catB')), 2);
        $this->assertEquals(count($this->planet->_filterItemsByCategory($this->items, 'catC')), 2);
        $this->assertEquals(count($this->planet->_filterItemsByCategory($this->items, 'CATA')), 2);
    }

    public function testFilterItemsByCategoryWithMultipleCategory()
    {
        $this->assertEquals(count($this->planet->_filterItemsByCategory($this->items, 'catA,catB')), 3);
        $this->assertEquals(count($this->planet->_filterItemsByCategory($this->items, 'catA,catB,catC')), 4);
        $this->assertEquals(count($this->planet->_filterItemsByCategory($this->items, 'catA, catB')), 3);
    }

}