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Unit test Automation script – How to mock Element/Service Object?

Solved923 views9th December 2021automation scipt Unit Tests
3
Tim Vandenbruwaene [SLC] [DevOps Enabler]2.18K 9th December 2021 0 Comments

In an automation script you con do engine.FindElement() / engine.FindService() . This returns an element/Service object.

The method I want to test uses an IEngine input and relies on a engine.FindService, then I do a getpropertyvalue of a property of the service.

Based on those values I do an engine.Findelement. On that element I do a getparameter.

I'm unable to mock a service/element as it complaing of not having a default constructor. It only has an internal constructor.

Example of mock code:

Mock<Service> mockService = new Mock<Service>();
mockService.Setup(x => x.GetPropertyValue("UserData")).Returns("test");

However then the error returned is the following:
System.NotSupportedException: Parent does not have a default constructor. The default constructor must be explicitly defined.

The only way I can think of to get around this is by making wrappers for the different classes.
But that seems like a lot of overhead just to mock 4 methods.

engine.FindElement("")
element.GetParameter()
engine.FindServiceByKey("")
service.GetPropertyValue()

What would be the best way to mock/fake the above methods?

Tim Vandenbruwaene [SLC] [DevOps Enabler] Selected answer as best 9th December 2021

1 Answer

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Gellynck Jens [SLC]2.71K Posted 9th December 2021 2 Comments

Hi Tim,

A default constructor was added on the Element & Service types with release note 30003 (since 10.1.10.0), would it be an option to run your unit tests using the SLManagedAutomation.dll from a version higher than this?

Tim Vandenbruwaene [SLC] [DevOps Enabler] Selected answer as best 9th December 2021
Gellynck Jens [SLC] commented 9th December 2021

For completeness, the following types have default constructors since 10.1.10: Element, MailReportOptions, RedundancyGroup, ScriptDummy, ScriptMemory, ScriptParam, Service

Tim Vandenbruwaene [SLC] [DevOps Enabler] commented 9th December 2021

That has done the trick, referenced the newer dll in my test project and now it can use the mock.
Thanks

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