Selecting The Correct Constructor When Testing With AutoFixture

, , ,

The new version of AutoFixture has attribute [Greedy] to select the constructor with that has the most arguments while creating an instance of the related type. There are also other possibilities like [Modest]. See them for XUnit from the repository.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
public class Example
{
  private readonly IFoo _foo;
  private readonly IBar _bar;

  public Example()
  {}

  public Example(IFoo foo, IBar bar)
  {
    _foo = foo;
    _bar = bar;
  }
}

public class ExampleTest
{
  [Theory]
  [AutoMoqData] // Using AutoFixture.AutoMoqCustomization
  public void MyTest([Greedy] Example sut)
  {
    // sut will have IFoo and IBar auto injected at this point
  }
}