test(e2e): add Enterprise SSO tests

[tmilewski]

Description

• Adds the first basic Enterprise SSO E2E tests, covering SAML enterprise connection setup and sign-in redirect behavior on Tanstack React Start
• Creates a new with-enterprise-sso environment preset backed by a Clerk instance with Enterprise Connections enabled
• Tests create a fake SAML connection via the Backend API, then verify the sign-in UI correctly redirects managed-domain emails to the IdP and leaves non-managed emails on the regular sign-in flow

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

Summary by CodeRabbit

• New Features

  • Enterprise SSO support has been added to Tanstack React Start, enabling SAML-based authentication for enterprise domains.

• Tests

  • Added comprehensive enterprise SSO integration tests covering sign-in flows for managed and non-managed domain scenarios.

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	Mar 16, 2026 10:47pm

[changeset-bot]

🦋 Changeset detected

Latest commit: ba0d6bc

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commit: ba0d6bc

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: ASSERTIVE

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Run ID: 7e647c3a-8ca8-4cc6-97c1-663bed8194d4

📥 Commits

Reviewing files that changed from the base of the PR and between 291733c and ba0d6bc.

📒 Files selected for processing (5)

• .changeset/light-queens-study.md
• integration/.keys.json.sample
• integration/presets/envs.ts
• integration/presets/longRunningApps.ts
• integration/tests/tanstack-start/enterprise-sso.test.ts

---

📝 Walkthrough

Walkthrough

This pull request introduces enterprise single sign-on (SSO) integration testing infrastructure. Changes include adding a new environment preset configured with enterprise SSO settings, establishing a corresponding sample configuration entry, integrating the new environment into the long-running app test suite, and implementing a new test module with setup and teardown logic. The test module verifies sign-in behavior for enterprise-managed and non-managed email domains by simulating SAML IdP interactions. No modifications were made to existing functionality or public APIs beyond introducing new exports.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title 'test(e2e): add Enterprise SSO tests' directly and clearly describes the main change—adding end-to-end tests for Enterprise SSO functionality, which is the primary focus of the changeset.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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📝 Coding Plan

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