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PORhino Mock Entity Framework using UnitofWork Pattern not working
 

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  1. PORhino Mock Entity Framework using UnitofWork Pattern not working
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    <p>This is my first attempt at something like this, so hopefully this is simple.</p> <p>I have created a WCF service which uses Entity Framework to access the database. I have implemented a <em>UnitOfWork</em> interface so my service can use EF while still being testable.</p> <p>Here is my service:</p> <pre><code>public class ProjectService : IProjectService { private IUnitOfWork db = null; public ProjectService(IUnitOfWork unitofwork) { db = unitofwork; } public int RegisterSite(int CPUID) { if (db.Servers.Count(x =&gt; x.CPUID == CPUID) &gt; 0) { // do something } return 0; } } </code></pre> <p>Here is my UnitOfWork interface:</p> <pre><code>public interface IUnitOfWork { IObjectSet&lt;tblClient&gt; Clients { get; } IObjectSet&lt;tblServer&gt; Servers { get; } IObjectSet&lt;tblSite&gt; Sites { get; } IObjectSet&lt;tblServerLog&gt; ServerLogs { get; } void Commit(); } </code></pre> <p>When I use this Service with either concrete implementations of a <code>SQLUnitOfWork</code> (using EF) or with a <code>InMemoryUnitOfWork</code> (just in memory objects) then it works fine. </p> <p>After testing fine with my in memory objects i tried this test.</p> <pre><code>[Test] public void RegisterAnExistingServer() { MockRepository mocks = new MockRepository(); IUnitOfWork MockUnitOfWork = mocks.DynamicMock&lt;IUnitOfWork&gt;(); ProjectService service = new ProjectService(MockUnitOfWork); Expect.Call(MockUnitOfWork.Servers.Count(x =&gt; x.CPUID == 1234)).Return(0); mocks.ReplayAll(); int NewSiteID = service.RegisterSite(1234); mocks.VerifyAll(); } </code></pre> <p>But when I try using it in Rhino Mock with an Expectation on Servers.Count I get the following error:</p> <pre><code>System.ArgumentNullException : Value cannot be null. Parameter name: arguments at System.Linq.Expressions.Expression.RequiresCanRead(Expression expression, String paramName) at System.Linq.Expressions.Expression.ValidateOneArgument(MethodBase method, ExpressionType nodeKind, Expression arg, ParameterInfo pi) at System.Linq.Expressions.Expression.ValidateArgumentTypes(MethodBase method, ExpressionType nodeKind, ref ReadOnlyCollection`1 arguments) at System.Linq.Expressions.Expression.Call(Expression instance, MethodInfo method, IEnumerable`1 arguments) at System.Linq.Queryable.Count(IQueryable`1 source, Expression`1 predicate) </code></pre> <p>What am I doing wrong??</p>
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    1. USSteveC
    1. USg.foley
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    1. COPerhaps the error refers to that `Servers` is null. I think you have to set that up too.
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      1. USMikael Östberg
    2. COso i added this line `MockUnitOfWork.Servers = mocks.StrictMock<IObjectSet<tblServer>>();` and still the same error. Is that what you meant?
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      1. USg.foley
    3. COOne suggestion, I would not use the Record and Playback syntax as it has been superceeded by the preferred Arrange-Act-Assert style. With RhinoMocks it can be hard to tell them apart due to the API being in the same namespace (last time I checked).
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