More quality unit tests for EnvsClustersTenantsControllerService service class to be added

[muralibasani]

What is currently missing?

To improve the stability of Klaw, we need to make sure there are good enough tests to cover important code snippets.
Unit tests for EnvsClustersTenantsControllerService service class is around 30% which should be improved.

How could this be improved?

More quality unit tests for EnvsClustersTenantsControllerService service class to be added and also make sure the line coverage is around 85%. If any refactoring is required to achieve the same, please go ahead.

Is this a feature you would work on yourself?

• I plan to open a pull request for this feature