<?php

use PHPUnit\Framework\TestCase;

class FormatImplementationTest extends TestCase
{
    private $class;
    private $obj;

    /**
     * @dataProvider dataFormatsProvider
     */
    public function testClassName($path)
    {
        $this->setFormat($path);
        $this->assertTrue($this->class === ucfirst($this->class), 'class name must start with uppercase character');
        $this->assertEquals(0, substr_count($this->class, ' '), 'class name must not contain spaces');
        $this->assertStringEndsWith('Format', $this->class, 'class name must end with "Format"');
    }

    /**
     * @dataProvider dataFormatsProvider
     */
    public function testClassType($path)
    {
        $this->setFormat($path);
        $this->assertInstanceOf(FormatAbstract::class, $this->obj);
    }

    public function dataFormatsProvider()
    {
        $formats = [];
        foreach (glob(__DIR__ . '/../formats/*.php') as $path) {
            $formats[basename($path, '.php')] = [$path];
        }
        return $formats;
    }

    private function setFormat($path)
    {
        $this->class = basename($path, '.php');
        $this->assertTrue(class_exists($this->class), 'class ' . $this->class . ' doesn\'t exist');
        $this->obj = new $this->class();
    }
}