Get method name of property setter in c#

Question

I am using FakeItEasy to check that a call to the public setter method of a property has been called.

The property is called Description, and at the moment I am testing it like this:

A.CallTo(model)
    .Where(x => x.Method.Name.Equals("set_Description"))
    .WithAnyArguments()
    .MustHaveHappened();

This works functionally, however the downside of using a magic string for the method name is that if I refactor the name of the property, the test will fail and I will have to manually change the strings in all of the tests.

Ideally, I would like to know of a way to do it like in this piece of pseudocode:

var setterName = model.GetType()
                         .SelectProperty(x => x.Description)
                         .GetSetterName();

A.CallTo(model)
    .Where(x => x.Method.Name.Equals(setterName))
    .WithAnyArguments()
    .MustHaveHappened();

This way, if I right-click refactor the Description property, the tests won't need to be updated. How can I do this?

As an aside, you can omit `WithAnyArguments` here, if you're so inclined. — Blair Conrad, Feb 24 '16 at 11:13
Why is that @BlairConrad? Is `WithAnyArguments` implied if I don't specifically declare the constraints? — James Monger, Feb 24 '16 at 11:31
that's exactly why. Hmm. I can't put @JamesMonger in here. At the beginning, it seems. Ah. Because "the post owner will always be notified". The things you learn. — Blair Conrad, Feb 24 '16 at 15:18

score 3 · Answer 1 · answered Feb 24 '16 at 11:22

3

Your pseudocode was on the right track.

var setterName = model.GetType()
                     .GetProperty(nameof(Description))
                     .GetSetMethod();

Note that nameof is only available in C# 6.

answered Feb 24 '16 at 11:22

Dennis_E

8,751
23
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Thanks for the help, @Dennis_E. I chose Terje's answer as it is a bit more concise, however I appreciate you taking the time to answer. I also appreciate that yours is a bit more robust as it does not even include the `set_` string. Thanks again! – James Monger Feb 24 '16 at 11:30

score 2 · Accepted Answer · answered Feb 24 '16 at 11:07

2

I think you can do this with the nameof keyword: https://msdn.microsoft.com/en-us/library/dn986596.aspx

So I guess it would be something like

.Where(x => x.Method.Name.Equals("set_" + nameof(x.Description))

answered Feb 24 '16 at 11:07

Terje Kolderup

367
3
12

score 1 · Answer 3 · answered May 31 '16 at 14:16

1

Note that as of FakeItEasy 2.0.0, if the setter has a getter as well, you can use the new A.CallToSet method:

A.CallToSet(() => model.Description).MustHaveHappened();

answered May 31 '16 at 14:16

Blair Conrad

233,004
25
132
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Get method name of property setter in c#

3 Answers3