public function testAllowsLinearGrowth()
{
$size = Size::withLinearGrowth(1000);
$this->assertEquals(0, $size->at(0));
$this->assertEquals(1, $size->at(1));
$this->assertEquals(2, $size->at(2));
$this->assertEquals(3, $size->at(3));
$this->assertEquals(4, $size->at(4));
}