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PONancyFX: How do I deserialize dynamic types via BrowserResponse.Body.DeserializeJson (unit tests)
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  1. PONancyFX: How do I deserialize dynamic types via BrowserResponse.Body.DeserializeJson (unit tests)
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    copied!<p>I have the following NancyFX unit test. I use the <a href="http://shouldly.github.com/" rel="nofollow noreferrer">Shouldly</a> assertion library to give the set of extensions methods that start <code>.Should---</code></p> <pre><code>[Fact] public void Assessment__Should_return_assessment_state_for_specified_user() { const AssessmentState assessmentState = AssessmentState.Passed; var user = Fake.Mentor(); using (var db = Fake.Db()) { db.Save(user); Fake.Assessment(user.Id, db, assessmentState); db.ClearStaleIndexes(); } var response = Fake.Browser(user.UserName, user.Password) .Get("/assessment/state/" + user.Id, with =&gt; with.HttpRequest()); //var result = (dynamic)body.DeserializeJson&lt;ExpandoObject&gt;(); var result = (dynamic) JsonConvert.DeserializeObject&lt;ExpandoObject&gt;(response.Body.AsString()); result.ShouldNotBe(null); ((AssessmentState) result.State).ShouldBe(assessmentState); } </code></pre> <p>This test calls a <code>AssessmentService</code> uri defined as <code>/assessment/state/" + user.Id</code> which returns a simple JSON object definition that has a single property <code>State</code> of type (enum) <code>AssessmentState</code>, either <code>Passed</code>, <code>Failed</code> or <code>NotStarted</code>. </p> <p>Here is the service handler so you can see there are no tricks.</p> <pre><code>Get["/assessment/state/{userid}"] = parameters =&gt; { var assessment = AssessmentService.GetByUserId(Db, (string)parameters.userid); return assessment == null ? HttpStatusCode.NotFound : Response.AsJson(new { assessment.State }); }; </code></pre> <p>And here is an example the JSON this service call returns:</p> <pre><code>{"State":1} </code></pre> <p>Everything works fine until I try to Deserialize the JSON returned by the fake Nancy browser. First I tried to use the built in method provided by Nancy's <code>BrowserResponse.Body</code> object:</p> <pre><code>var result = (dynamic)response.Body.DeserializeJson&lt;ExpandoObject&gt;(); </code></pre> <p>This deserializes to an empty object. Which is no good. However, if we use the Newtonsoft equivalent then everything is fine (almost).</p> <pre><code>var result = (dynamic) JsonConvert.DeserializeObject&lt;ExpandoObject&gt;(response.Body.AsString()); </code></pre> <p>The JSON deserialization now works and so the following Shouldly assertion passes with flying colours:</p> <pre><code>((AssessmentState) result.State).ShouldBe(assessmentState); </code></pre> <p>However, for reasons that I suspect have to do with anonymous types, the following line fails at run-time (it compiles fine).</p> <pre><code>result.ShouldNotBe(null); </code></pre> <p><img src="https://i.stack.imgur.com/MoFuu.png" alt="Shouldly Exception"></p> <p>That is quite a lot of information. Let me distil it down to two questions:</p> <ol> <li><p>Why does Nancy's built in JSON deserializer not work given that the Newtonsoft version does?</p></li> <li><p>How do I work with the dynamic types generated by the JSON de-serialisation so that the Shouldly extension methods do not cause a run-time exception?</p></li> </ol> <p>Thanks</p>
 

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