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)); }