Nsubstitute check if setter has been called

scher Published at Dev

scher

I have an interface with a property:

public interface Filterable<T>
{
    Filter<T> Filter { get; set; }
}

I have a method simelar to this one:

public void SetTheFilter<T>(Filterable<T> filterable, Filter<T> filter)
{
    If (filter.IsActive)
        filterable.Filter = filter;
}

How can I ensure with NSubstitute with in a unit test that the filter has been set. I tried to do it in the following way, but it just tests the getter:

[TestMethod]
public void SetTheFilter_WhenCalledWithFilterActive_SetsTheFilterOfFilterable()
{
    var filterable = Substitute.For<Filterable<String>>();
    var filter = new StringFilter();

    SetTheFilter(filterable, filter);

    var tmp = filterable.Recieved().Filter;
}

Does anybody knows how to test, if the setter has been called?

David Tchepak

The standard way to test this is to just read the value back out of the property:

Assert.AreEqual(filterable.Filter, filter);

If for some reason you really want to test a setter was called, you can do:

filterable.Received().Filter = filter;

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edited at2021-02-24

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