How do I test on Safari while building my webapps; I only have a single machine that runs Linux and Windows; and the last Safari release for Windows is from 201

How do I test on Safari while building my webapps; I only have a single machine that runs Linux and Windows; and the last Safari release for Windows is from 2015. It was very recent that I came accross a flexbox bug with flex-wrap which had me scrambling to find someone with an iOS device so I could test on Safari and that was pretty painful. PS; I am not very well off, so buying devices merely for testing on a browser seem pretty overkill.