Testing a website using Safari on Linux

I run linux and use virtualbox to cross browser test my website. I have Windows10 and Windows7 within virtual box which allows me to test the site with IE and Edge browsers. I have never used Apple/Mac OS so I am very much in uncharted territory here. I need to test the site on Safari but after searching online, it appears as though it isn't possible to download a MacOS ISO to install in virtualbox: link (I do not have access to an apple computer) I tried installing Safari on a windows VM but it is a really old version since Safari is not supported on Windows. Also, from what I can tell there are no Linux versions of Safari. Is there a way to test the site using Safari somehow without owning a Mac?