test(controller): improve code coverage (#5816)

* chore(controller): Test controller Execute function (#5150)

Signed-off-by: Tobias Harnickell <[email protected]>

* chore(controller): Prevent testing data race (#5150)

Signed-off-by: Tobias Harnickell <[email protected]>

* test(controller): Fix controller test lint issues

Signed-off-by: Tobias Harnickell <[email protected]>

* test(controller): Add non-breaking controller tests (#5150)

Signed-off-by: Tobias Harnickell <[email protected]>

* test(controller): patch go-lint results

Signed-off-by: Tobias Harnickell <[email protected]>

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Signed-off-by: Tobias Harnickell <[email protected]>

Author: TobyTheHutt