How can I instruct AutoFixture to not bother filling out some properties?

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The answer provided by Nikos Baxevanis provides various convention-based ways to answer the question. For completeness sake, you can also do a more ad-hoc build:

var phoneBook = fixture.Build<PhoneBook>().Without(p => p.AllContacts).Create();

If you want your Fixture instance to always do this, you can Customize it:

fixture.Customize<PhoneBook>(c => c.Without(p => p.AllContacts));

Every time that Fixture instance creates an instance of PhoneBook, it’ll skip the AllContacts property, which means that you can go:

var sut = fixture.Create<OfficeBuilding>();

and the AllContacts property will remain untouched.

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