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POTesting a service using mock repository objects
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  1. POTesting a service using mock repository objects
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    copied!<p>I am testing a service within a framework. </p> <p>In order to initialize the service, I am using mock repository objects.</p> <p><strong>ServiceTest.cs</strong></p> <pre><code>private IRepository _repository; private IService _service; private List&lt;Object&gt; _objects; [TestInitialize] public void Initialize() { _repository = new Mock&lt;IRepository&gt;().Object; _service = new Service(repository); _objects = new List&lt;Object&gt;() { new Object { Name = "random", ID = 1 }, new Object { Name = "not so random", ID = 1}, new Object { Name = "random", ID = 2 }, new Object { Name = "not so random", ID = 2} }; //attempt at mocking the repository _repository.Setup(r =&gt; r.GetObjects(It.IsAny&lt;string&gt;(), It.IsAny&lt;int&gt;())).Returns(_objects.Where(o =&gt; o.Name == _objects.Name &amp;&amp; o.ID == _objects.ID).ToList()); } [TestMethod] public void GetObjects_ReturnObjectsList() { //Arrange var name = "random"; //Act var objects = _service.RetrieveObjects(name, 2); //Assert Assert.AreEqual(name, objects.Single().Name); } </code></pre> <p>However, when I test the service, I get <code>ArgumentNullExceptions</code>. The variables set to the repository method calls return <code>null</code>, and eventually throws an error when business logic is run.</p> <p><strong>Service.cs</strong></p> <pre><code> public List&lt;Objects&gt; RetrieveObjects(string name, int id) { var getObjects = repository.GetObjects(name, id); //getObjects return null DoLogic(getObjects); //ArgumentNullException is thrown here return getObjects; } </code></pre> <p>I have looked up information on mocking repositories, but seems like I will have a lot to setup just to test. I am wondering if the setup is worth it.</p> <p>Why am I getting <code>ArgumentNullExceptions</code>? Is there a way to test methods that call repositories?</p>
 

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