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When I run this code on version 0.4.21.5:

public class Test
{
    public string Property
    {
        get { return null; }
    }
}

public class when_observing_test : Observes<Test>
{
    It should_not_fail_but_it_does = () => Console.WriteLine("Will fail");
}

I get:

System.ArgumentException: Property set method not found.
at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)
at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, Object[] index)
at developwithpassion.specifications.core.reflection.PropertyInfoMemberAccessor.change_value_to(Object target, Object new_value) in PropertyInfoMemberAccessor.cs: line 27
at developwithpassion.specifications.core.factories.NonCtorDependencySetter.<>c__DisplayClass7.<attempt_to_update_all_of_the_accessors>b__5(MemberAccessor accessor) in NonCtorDependencySetter.cs: line 42
at developwithpassion.specifications.extensions.IterationExtensions.each(IEnumerable1 items, Action1 action) in IterationExtensions.cs: line 13
at developwithpassion.specifications.core.factories.NonCtorDependencySetter.attempt_to_update_all_of_the_accessors(IEnumerable1 accessors_to_update, Object target) in NonCtorDependencySetter.cs: line 40 at developwithpassion.specifications.core.factories.NonCtorDependencySetter.update(Object item) in NonCtorDependencySetter.cs: line 35 at developwithpassion.specifications.faking.DefaultSUTFactory1.create_automatically() in DefaultSUTFactory.cs: line 32
at developwithpassion.specifications.faking.DefaultSUTFactory1.create() in DefaultSUTFactory.cs: line 23 at developwithpassion.specifications.DefaultTestStateFor1.build_sut() in DefaultTestStateFor.cs: line 32
at developwithpassion.specifications.DefaultTestStateFor1.run_setup() in DefaultTestStateFor.cs: line 43 at developwithpassion.specifications.DefaultObservationController2.run_setup() in DefaultObservationController.cs: line 51
at developwithpassion.specifications.observations.InstanceObservations`3.<.ctor>b__0() in InstanceObservations.cs: line 14

In my production code Test.Property isn't really implemented like that. It's a calculated property and it just returns null in certain situations. Our unit tests fail then.

When Test class looks like this:
public class Test
{
public string Property
{
get { return "property value"; }
}
}

all works fine.

It was working ok with version 0.4.13.0 which we were using previously.