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POUnit Testing with DbContext mock through Service Layer
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  1. POUnit Testing with DbContext mock through Service Layer
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    copied!<p>I'm a beginner at writing unit tests and I have a test I'm trying to get working. I'll start of by explaining what I'm trying to test.</p> <p>I'm trying to test a method which saves messages in a Mvc 4 project. The method is called <code>SaveMessage</code> and is shown below.</p> <pre><code>namespace ChatProj.Service_Layer { public class UserService : IUserService { public MessageContext messageContext = new MessageContext(); public UserService() { _messageRepository = new MessageRepository(messageContext); } private IMessageRepository _messageRepository; -&gt; public void SaveMessage(Message message) { messageContext.Messages.Add(message); _messageRepository.Save(); } </code></pre> <p>The <code>_messageRepository.Save</code> in the <code>SaveMessage</code> method is implemented in my DAL layer <code>MessageRepository</code> and looks like this:</p> <pre><code>public void Save() { context.SaveChanges(); } </code></pre> <p>This way of saving will seem a bit overcomplicated, but I structured the project this way because I didn't want the service layer (<code>IUserService</code> &amp; <code>UserService</code>) to handle operations that could &amp; should (i think) be handled by the Data Access Layer (<code>IMessageRepository</code> &amp; <code>MessageRepository</code>). </p> <p>Now comes the tricky part. I've been trying to understand how I could unit test this. This is my try:</p> <pre><code>namespace ChatProj.Tests { [TestFixture] class MessageRepositoryTests { [SetUp] public void Setup() { } [Test] public void SaveMessage_SaveWorking_VerifyUse() { //Arrange var userServiceMock = new Mock&lt;UserService&gt;(); var message = new Message { MessageID = 0, Name = "Erland", MessageString = "Nunit Test", MessageDate = DateTime.Now }; var repositoryMock = new Mock&lt;IMessageRepository&gt;(); var contextMock = new Mock&lt;MessageContext&gt;(); MessageRepository messageRepository = new MessageRepository(contextMock.Object); UserService userService = new UserService(); //Act userService.SaveMessage(message); //Assert repositoryMock.Verify(m =&gt; m.Save()); userServiceMock.Verify(m =&gt; m.SaveMessage(message)); } } </code></pre> <p>I get this error: <a href="http://imgur.com/B6OSjLI" rel="nofollow" title="hej">Imgur link</a> , and I'm not quite sure how to solve it. I've tried looking at several other SO posts but I fail to make the test work. </p> <p>So I'm wondering, how do I practically get my Unit Test to work? </p>
 

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