<?php
/**
 * Copyright 2018 Kacper Donat
 *
 * @author Kacper "Kadet" Donat <kacper@kadet.net>
 *
 * Full license available in separate LICENSE file
 */

use Kadet\Functional as f;

class MemoizedFunctionTest extends \PHPUnit\Framework\TestCase
{
    /** @var \PHPUnit\Framework\MockObject\MockObject */
    private $mock;

    protected function setUp(): void
    {
        $this->mock = $this->createMock(MemoizedTarget::class);
    }

    public function testCalledOnlyOnce()
    {
        $memoized = f\memoize([$this->mock, 'memoized']);

        $this->mock->expects($this->once())->method('memoized')->with();

        for ($i = 0; $i < 10; $i++) {
            $memoized();
        }
    }

    public function testCalledOnlyOncePerArgs()
    {
        $memoized = f\memoize([$this->mock, 'memoized']);

        $calls = [];
        $this->mock->expects($this->exactly(2))->method('memoized')->willReturnCallback(
            function (...$args) use (&$calls) {
                $calls[] = $args;
            }
        );

        for ($i = 0; $i < 10; $i++) {
            $memoized('a');
            $memoized([]);
        }

        $this->assertSame([['a'], [[]]], $calls);
    }
}

class MemoizedTarget
{
    public function memoized() {}
}