<?php

namespace Tests\Etron\GFX;

use Etron\GFX\_I_Color;
use Etron\GFX\Color;
use PHPUnit_Framework_TestCase;

abstract class _I_ColorTest extends PHPUnit_Framework_TestCase
{
    /**
     * @return _I_Color
     */
    abstract function getEmptyObj();

    /**
     * @covers _I_Color::adjustBrightness()
     */
    function testAdjustBrightnessPositive()
    {
        $obj = $this->getEmptyObj()->setRGB(0, 0, 0);

        $modObj = $obj->adjustBrightness(100);

        $this->assertInstanceOf(_I_Color::class, $modObj);

        $this->assertEquals([100, 100, 100], $modObj->getRGB());
    }

    /**
     * @covers _I_Color::adjustBrightness()
     */
    function testAdjustBrightnessNegative()
    {
        $obj = $this->getEmptyObj()->setRGB(200, 200, 200);

        $modObj = $obj->adjustBrightness(-100);

        $this->assertInstanceOf(_I_Color::class, $modObj);

        $this->assertEquals([100, 100, 100], $modObj->getRGB());
    }

    /**
     * @covers _I_Color::adjustBrightness()
     */
    function testAdjustBrightnessUpperBoundary()
    {
        $obj = $this->getEmptyObj()->setRGB(0, 0, 0);

        $modObj = $obj->adjustBrightness(300);

        $this->assertInstanceOf(_I_Color::class, $modObj);

        $this->assertEquals([255, 255, 255], $modObj->getRGB());
    }

    /**
     * @covers _I_Color::adjustBrightness()
     */
    function testAdjustBrightnessLowerBoundary()
    {
        $obj = $this->getEmptyObj()->setRGB(100, 100, 100);

        $modObj = $obj->adjustBrightness(-300);

        $this->assertInstanceOf(_I_Color::class, $modObj);

        $this->assertEquals([0, 0, 0], $modObj->getRGB());
    }

}

class ColorTest extends _I_ColorTest
{
    function getEmptyObj()
    {
        return new Color;
    }
}