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    <p>First of all, I'm going to answer this question under the assumption that <code>TypesWithoutPublicCtrs</code> is <a href="https://github.com/DavidSSL/AutoFixtureDeclarative/blob/0.0.1/Examples/TypesWithoutPublicCtrs.cs" rel="nofollow">defined as in the OP's GitHub repository</a>:</p> <pre><code>public class TypesWithoutPublicCtrs { private readonly IMyInterface _mi; public TypesWithoutPublicCtrs(IMyInterface mi) { _mi = mi; } } </code></pre> <p>The reason I'm explicitly calling this out is because the name is a red herring: it <em>does</em> have a public constructor; it just doesn't have a <em>default</em> constructor.</p> <p>Anyway, AutoFixture easily deals with the absence of default constructors. The problem here isn't the <code>TypesWithoutPublicCtrs</code> class itself, but rather the <code>IMyInterface</code> interface. Interfaces are problematic because they can't be initialized at all.</p> <p>Thus, you need to somehow map an interface to a concrete class. There are various ways to do that.</p> <p><strong>One-off solution</strong></p> <p>Once in a while, I use this one-off solution, although I find it ugly. However, it's easy and doesn't require a lot of sophisticated setup.</p> <pre><code>[Theory, AutoData] public void TestSomething( [Frozen(As = typeof(IMyInterface))]FakeMyInterface dummy, TypesWithoutPublicCtrs sut) { // use sut here, and ignore dummy } </code></pre> <p>This isn't particularly nice, because it relies on a side-effect of the <code>[Frozen]</code> attribute, but it works as a self-contained one-off solution.</p> <p><strong>Convention</strong></p> <p>However, I much rather like to make a convention out of it, so that the same convention applies for all tests in a test suite. A test using such a convention could look like this:</p> <pre><code>[Theory, MyTestConventions] public void TestSomething(TypesWithoutPublicCtrs sut) { // use sut here; it'll automatically have had FakeMyInterface injected } </code></pre> <p>The <code>[MyTestConventions]</code> attribute could look like this:</p> <pre><code>public class MyTestConventionsAttribute : AutoDataAttribute { public MyTestConventionsAttribute() : base(new Fixture().Customize(new MyTestConventions()) {} } </code></pre> <p>The <code>MyTestConventions</code> class must implement the interface <code>ICustomization</code>. There are several ways in which you can map <code>IMyInterface</code> to <code>FakeMyInterface</code>; here's one:</p> <pre><code>public class MyTestConventions : ICustomization { public void Customize(IFixture fixture) { fixture.Customizations.Add( new TypeRelay(typeof(IMyInterface), typeof(FakeMyInterface))); } } </code></pre> <p><strong>Auto-Mocking</strong></p> <p>However, you may get tired of having to create and maintain all those Fakes, so you can also turn AutoFixture into an <a href="http://blog.ploeh.dk/2013/03/11/auto-mocking-container" rel="nofollow">Auto-Mocking Container</a>. There are various options for doing that, <a href="http://blog.ploeh.dk/2010/08/19/AutoFixtureasanauto-mockingcontainer/" rel="nofollow">leveraging Moq</a>, <a href="http://nuget.org/packages/AutoFixture.AutoNSubstitute/" rel="nofollow">NSubstitute</a>, <a href="http://nuget.org/packages/AutoFixture.AutoFakeItEasy" rel="nofollow">FakeItEasy</a> and <a href="http://nuget.org/packages/AutoFixture.AutoRhinoMocks/" rel="nofollow">Rhino Mocks</a>.</p>
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    1. POWhat are the principles behind AutoFixture's declarative way of setting up a fixture?
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    1. USMark Seemann
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