public function testCartesianProduct()
{
$a = new FixturePaths();
static::assertFalse($a->hasPaths());
$a->addPaths('/root/one/', '/root/two/');
static::assertTrue($a->hasPaths());
$b = new FixturePaths();
static::assertFalse($b->hasPaths());
$b->addPaths('some/random/path', 'another/random/path', 'one/last/one');
static::assertTrue($b->hasPaths());
$product = $a->cartesianProduct($b);
$result = $product->getPaths();
$expect = ['/root/one/some/random/path', '/root/two/some/random/path', '/root/one/another/random/path', '/root/two/another/random/path', '/root/one/one/last/one', '/root/two/one/last/one'];
static::assertTrue($product->hasPaths());
static::assertEquals($expect, $result);
static::assertCount(6, $product);
}
