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POHow to use Mock setup for nullable types
 

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  1. POHow to use Mock setup for nullable types
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    <p>I have an interface which has nullable parameters like this</p> <pre><code>Result&lt;Notice&gt; List(int offset, int limit, Guid? publicationId, Guid? profileId, DateTime? toDate, ListingOrder order); </code></pre> <p>This is how I attempted to mock this this method</p> <pre><code>mockNoticesClient.Setup(c =&gt; c.List(It.IsAny&lt;int&gt;(), It.IsAny&lt;int&gt;(), It.IsAny&lt;Nullable&lt;Guid&gt;&gt;(), It.IsAny&lt;Nullable&lt;Guid&gt;&gt;(), It.IsAny&lt;Nullable&lt;DateTime&gt;&gt;(), Data.Notices.ListingOrder.DateDesc)).Returns(dataNotices); </code></pre> <p>Then when trying to use the method</p> <pre><code>var results = this.noticesClient.List(0, 100, null, profileId, latestNoticeTime, Data.Notices.ListingOrder.DateDesc); </code></pre> <p>Whenever this line is run though this exception is thrown</p> <pre><code>... threw an exception of type 'System.NullReferenceException' ... {System.NullReferenceException} </code></pre> <p>I have tried a few different combinations like using setup with null in the parameter but this doesn't work either. I am using Moq 4.0.10827 which is the latest version (at present).</p> <p><strong>Edit:</strong> The constructor for the noticesClient takes the interface for the dataNoticesClient</p> <pre><code>public Client(Data.Notices.INotices noticesClient) </code></pre> <p>and initalised like this </p> <pre><code>mockNoticesClient = new Mock&lt;Data.Notices.INotices&gt;(); noticesClient = new Client(mockNoticesClient.Object); mockNoticesClient.Setup(c =&gt; c.List(It.IsAny&lt;int&gt;(), It.IsAny&lt;int&gt;(), It.IsAny&lt;Nullable&lt;Guid&gt;&gt;(), It.IsAny&lt;Nullable&lt;Guid&gt;&gt;(), It.IsAny&lt;Nullable&lt;DateTime&gt;&gt;(), It.IsAny&lt;Data.Notices.ListingOrder&gt;())).Returns(dataNotices); mockNoticesClient.Setup(c =&gt; c.List(It.IsAny&lt;int&gt;(), It.IsAny&lt;int&gt;(), It.IsAny&lt;Guid?&gt;(), It.IsAny&lt;Guid?&gt;(), It.IsAny&lt;DateTime?&gt;(), It.IsAny&lt;Data.Notices.ListingOrder&gt;())).Returns(dataNotices); </code></pre>
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    1. PTQuestion
    1. USDanny Birch
    1. USDanny Birch
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      1. POHow to use Mock setup for nullable types
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      1. VTUpMod
    1. COWhat is `dataNotices`? Can you post the full stacktrace of the nullref exception? Which variable is null `results` or `noticesClient`? If `noticesClient` then you should check that it gets assigned.
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      1. POHow to use Mock setup for nullable types
      1. USnemesv
    2. CONeither variable is null, its the parameters that the list method takes. For some reason Moq is throwing an error whenever a nullable parameter is actually entered as null
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      1. USDanny Birch
    3. CODo you have a full stack trace for the exception?
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      1. POHow to use Mock setup for nullable types
      1. USScott Wegner
 

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