using jasmine / spyOn to mock an object with only particular properties defined

[Denisa Bokar]

Is it possible to mock an object using Jasmine .spyOn(), with only a subset of properties actually defined?

Basically, imagine I have a Page object that has deliveryTime, status, size properties on it. In my unit test, the values for status, size are not relevant - only the value in deliveryTime property is.  Some test fake code would be: spyOnProperty(page, "deliveryTime").and.returnValue(123); 

This would be equivalent to C# / Moq as: mock.Setup(foo => foo.Name).Returns("bar"); (more on C# Moq here https://github.com/Moq/moq4/wiki/Quickstart#properties)

Is there a way to achieve this? 

Note: My application is using Angular (7) with GraphQL with an angular GraphQL typescript generator. 

[Gregg Van Hove]

Jasmine's `spyOn` and `spyOnProperty` functions are meant for partial mocking on an existing object basically how you're describing. If you're looking for a way to provide a bare object with some functions that are spies, you should just need to make a new object with a property whose value is a spy created with `jasmine.createSpy`. I would probably not use a spied property in this case where a simple value will do.

Hope this helps. Thanks for using Jasmine!

- Gregg

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