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c#unit-testingautofixture

Omitting a specific field with CreateMany from AutoFixture


I want to create "many" instances of foo :

var fixture = new Fixture();
var expectedFoos = fixture.CreateMany<Foo>();

The problem is, Foo is an Entity Framework entity, with relations that I don't want to create. If I needed only one instance, I could do that :

var fixture = new Fixture();
var expectedFoo = fixture.Build<Foo>()
                         .Without(foo => foo.Relation1);
                         .Without(foo => foo.Relation2);

But how can I easily create multiple instances satisfying this condition ? I've read about specimen builders but it seems really overkill here.

I'm looking for something as simple as that (doesn't compile because BuildMany doesn't exist) :

var fixture = new Fixture();
var expectedFoos = fixture.BuildMany<Foo>()
                          .Without(foo => foo.Relation1);
                          .Without(foo => foo.Relation2);

Solution

  • That's what Customize is for:

    var fixture = new Fixture();
    fixture.Customize<Foo>(o => o
           .Without(foo => foo.Relation1)
           .Without(foo => foo.Relation2));
    var expectedFoos = fixture.CreateMany<Foo>();