Issue #3507900 by dydave: Added complete tests coverage of module's code base.
https://www.drupal.org/project/login_switch/issues/3507900
Added complete tests coverage of module's code base, see Functional tests class: LoginSwitchTest
Additional changes:
- Moved Login switch settings form under
Configuration > People, changed path and access requirements. - Removed event subscriber
ExceptionEventSubscribercausingdrupalLogoutto fail in test case. - Removed useless test class
LoadTest.