public function testOffsetX() { $object = new Group(); $line1 = new Line(10, 20, 30, 40); $object->addShape($line1); $this->assertEquals(10, $object->getOffsetX()); $this->assertInstanceOf('PhpOffice\\PhpPresentation\\Shape\\Group', $object->setOffsetX(rand(1, 100))); $this->assertEquals(10, $object->getOffsetX()); }