-Dummy values are accepted (Randon names or Namespace wich is not present) for `targetNamespaces` in `Operatorgroups` from RHOCP Console.
- Same thing is not possible via oc command line when we use 
~~~
$ oc edit og <OperatorGroups Name>
~~~ 
- In Installed operator we will get management namespace as `2 Namespaces`
- Operator will fail with 'error: MultiNamespace InstallModeType not supported, cannot configure to watch 2 namespaces'

Yes, tests are done on `3scale API Management` application.

1. Install `3scale API Management`  application on new test project from OperatorHub in Console.
2. Navigate to Console -> Installed operator -> Select test project -> Click on `3scale API Management` -> Scroll Down -> Click on test-XXYYZZ OperatorGroups -> YAML   
3. add new dummy namespece in `spec.targetNamespaces` as follow
~~~
spec:  
  targetNamespaces:    
  - test    
  - t1
~~~
4. Click on  `Save` then `Reload` 

operatorGroups manifest will be updated wethout any error

Any new randon Namesapce addition in `operatorGroups` must fail with proper validation error wnen we click on save