[NDR-408] Add an extra mtls test

[jameslinnell]

Overview

Jira ticket: NDR-408

Description

Add some extra tests for better coverage

Context

Checklist

Tasks for all changes:

• 1. I have linked this PR to its Jira ticket.
• 2. I have run git pre-commits.
• 3. I have added and/or updated relevant tests.
• 4. I have updated relevant documentation.
• 5. I have considered the cross-team impact (and have PR approval from both Core & Demographics if necessary).
• 6. I have successfully deployed this change to a sandbox and witnessed unit, e2e and smoke tests passing:
  • 6a. Deploy - Sandbox
  • 6b. SANDBOX Full- Deploy feature branch to sandbox

[github-actions]

Code security issues found

View full details here.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud