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POHow do I get arguments passed to a data access layer that uses System.Action as an input parameter?
 

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  1. POHow do I get arguments passed to a data access layer that uses System.Action as an input parameter?
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    <p>I'm trying to create some unit tests for an application I've recently inherited. Currently using NSubstitute because that's what the previous programmer used, but I'm not attached to it.</p> <p>The method I'm testing calls the DataService class' Create method.</p> <p><strong>Calling Create Method</strong></p> <pre><code>var contactProductLink = this.dsService.Create&lt;ContactProductLink&gt;(x =&gt; { x.ContactRoleId = prod.RoleId; x.ContactId = contactViewModel.ContactId; x.ProductId = prod.ProductId; x.Active = true; x.InsertDate = DateTime.Now; x.InsertUserId = user.employeeId; x.UpdateDate = DateTime.Now; x.UpdateUserId = user.employeeId; }); </code></pre> <p><strong>DataService Create Method:</strong></p> <pre><code>public TEntity Create&lt;TEntity&gt;(Action&lt;TEntity&gt; propertySetter = null) where TEntity : class { var tEntity = this.Context.Create&lt;TEntity&gt;(); if (propertySetter != null) { propertySetter(tEntity); } return tEntity; } </code></pre> <p>The approach I've taken (and maybe there's a better way) is to use NSubstitute to mock the DataService. When I'm doing my assertions at the end, I'm checking to make sure that the Create method was called:</p> <pre><code>mockDataSupplierService.Received().Create&lt;ContactProductLink&gt;(Arg.Any&lt;Action&lt;ContactProductLink&gt;&gt;()); </code></pre> <p>However, I'd like to also verify the input that was sent to the method is correct, and here's where I'm running into trouble. I can get the System.Action object that was passed to the Create method, but I can't figure out how to pull out the parameters (such as ContactRoleId, ContactId, etc. as posted in the calling create method code snippet).</p> <p>So after all of that what I'm asking is:</p> <ol> <li>How can I access those input parameters so I can verify the correct arguments are being passed to the data service? Is it even possible?</li> <li>Is there a better way to do this than what I'm currently trying to do?</li> </ol> <p><strong>Solution</strong> </p> <pre><code>//Arrange mockDataSupplierService.Create&lt;ContactProductLink&gt;(Arg.Do&lt;Action&lt;ContactProductLink&gt;&gt;(x=&gt; actionToPopulateEntity = x)); //Assert mockDataSupplierService.Received().Create&lt;ContactProductLink&gt;(Arg.Any&lt;Action&lt;ContactProductLink&gt;&gt;()); var entity = new ContactProductLink(); actionToPopulateEntity.Invoke(entity); Assert.AreEqual(ExpectedContactId, entity.ContactId); </code></pre>
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