How to test SSO providers (Microsoft / Google / Okta / Custom)

Hey! I'm adding SSO support with Next.js + Better Auth.
Right now I’m testing with Okta since I have a real Okta account, but I’m not sure how to properly test the other providers.

Do I need to buy Google Workspace Enterprise or Microsoft Entra just to verify everything works? I want to make sure login + attributes mapping work correctly for Google / Microsoft / Okta / custom SAML providers, but it feels weird to pay for each one just for testing.

Any advice on how you usually test multiple SSO providers without owning all of them?
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