Testing SSO Implementation

User registration is a significant barrier in the conversion funnel, with a mere 2% of visitors completing the process, but Single Sign-On (SSO) systems like Sign In with Google or Facebook can streamline this experience to just a few clicks, boosting user trust and engagement. Despite their benefits, SSO systems present complexities such as potential changes in provider APIs, language discrepancies, and varied regional interfaces, which make their implementation and testing challenging. While providers like Google and Facebook offer guidance for SSO testing, much of the process remains manual due to limited automated testing support. Key testing areas include ensuring correct login flows, managing account linking, handling email changes, addressing error states, and protecting against login CSRF attacks. Moreover, integrating SSO with specific systems like Salesforce requires careful configuration and testing of authorization URLs and internal settings. Overall, despite the challenges, SSO serves as both a security tool and a growth driver by reducing onboarding time and enhancing user confidence.