Since we're here, I hope someone creates another all encompassing SP/IDP emulator like samltest.id used to until the owner stopped paying. That made my life so much easier as a developer when SAML stuff came up. No one else has come close.
FWIW back in the day, samltest.id was a dummy IDP, whereas sptest.iamshowcase.com is a dummy SP. You could hook these two up to each other and see the whole flow.
