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Login as admin, access the Realms tool, and delete the the realm entitled '!su.can_su_realm'.
Select the test site that contains the SU Tool.
Type the name of any non-admin or admin user and select 'Become User' button (the latter case will fail the su, but should achieve the desired results for this test.)
If necessary, log out and re-login as an admin user.
Return to Realms tool and search for the above realm name.
Expected result: '!su.can_su_realm' will be created if missing the first time the tool is opened by a SuperUser.
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Login as admin, access the Realms tool, and delete the realm entitled '!su.can_su_realm'.
Log out and re-login as a non-admin user in the test site with the SU Tool.
Log out and re-login as admin.
Return to Realms tool and search for the above realm name.
Expected result: '!su.can_su_realm' will be created if missing the first time the tool is opened by a Standard User.
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