This test adds entries to the global reading list in Safari, and there's no
API for the test to clean up after itself, so the reading list becomes an
endless list of entries after a whlie.
Beside the fact that this is somewhat annoying for people who actually use
their reading lists, it can also can end up consuming a significant amount of
space on the hard drive, because Safari will download each site to be
available offline.
The default `Message` property is not every helpful. Better information
is available inside the `Error` property but it's not general (nor cross
platform) when dealing with exception.
Include unit tests (on an existing test checking NSError values)
https://github.com/xamarin/xamarin-macios/issues/4133
* Fix many version checks to be based on Xcode version instead of iOS version.
* Added/fixed a few expected values according to platform version to match behavior in older macOS versions.
Rolf Bjarne Kvinge
Vincent Dondain
Sebastien Pouliot
Timothy Risi