Implementation of assert named ResponseContentTypeEquals

Author: mihaj

Directory.Build.props

@@ -1,5 +1,5 @@
 <Project>
   <PropertyGroup>
-    <Version>0.3.2</Version>
+    <Version>0.3.3</Version>
   </PropertyGroup>
 </Project>

README.md

@@ -213,12 +213,13 @@ You can pass `X509Certificate2` objet to the `WithCertificateAuthentication` met
 This is an implementation of the HTTP response message asserter, which can be used to assert different parameters.
 
 Here is a list of Asserters:
-- `ResponseContentContains`: HTTP body contains a string (ignores case)
-- `RequestDurationEquals`: Verify request duration
-- `ResponseStatusCodeEquals`: Verify if response code equals
-- `ResponseHasHttpHeader`: HTTP response contains a header
-- `ResponseStatusCodeIsSuccess`: HTTP response status code is one of 2xx
-- `ResponseBodyIsEmpty`: HTTP response body is empty
+- `ResponseContentContains`: HTTP body contains a string (ignores case).
+- `RequestDurationEquals`: Verify request duration.
+- `ResponseStatusCodeEquals`: Verify if response code equals to specified.
+- `ResponseHasHttpHeader`: HTTP response contains a header.
+- `ResponseStatusCodeIsSuccess`: HTTP response status code is one of 2xx.
+- `ResponseBodyIsEmpty`: HTTP response body is empty.
+- `ResponseContentTypeEquals`: Check if HTTP response media type equals to specified.
 
 Asserter produces a list of `AssertResult`:
 

src/QAToolKit.Engine.HttpTester.Test/HttpTestAsserterTests.cs

@@ -5,6 +5,7 @@
 using System.Linq;
 using System.Net;
 using System.Net.Http;
+using System.Net.Http.Headers;
 using System.Runtime.InteropServices;
 using System.Threading.Tasks;
 using Xunit;
@@ -34,6 +35,7 @@ public async Task HttpTestAsserterSimple_Success()
                     .ResponseContentContains("scott")
                     .RequestDurationEquals(duration, (x) => x < 2000)
                     .ResponseStatusCodeEquals(HttpStatusCode.OK)
+                    .ResponseContentTypeEquals("application/json")
                     .ResponseHasHttpHeader("Date")
                     .AssertAll();
 
@@ -121,6 +123,7 @@ public async Task HttpTestAsserterHeaderMissing_Fails()
                     .RequestDurationEquals(duration, (x) => x < 2000)
                     .RequestDurationEquals(httpDuration, (x) => x < 1800)
                     .ResponseStatusCodeEquals(HttpStatusCode.OK)
+                    .ResponseContentTypeEquals("application/json")
                     .ResponseHasHttpHeader(null)
                     .AssertAll());
             }
@@ -146,6 +149,7 @@ public async Task HttpTestAsserterBodyNull_Fails()
                 Assert.Throws<ArgumentNullException>(() => asserter
                     .ResponseContentContains(null)
                     .RequestDurationEquals(duration, (x) => x < 1000)
+                    .ResponseContentTypeEquals("application/json")
                     .ResponseStatusCodeEquals(HttpStatusCode.OK)
                     .AssertAll());
             }
@@ -172,10 +176,11 @@ public async Task HttpTestAsserterAlternativeDurationPredicate_Success()
                     .ResponseContentContains("id")
                     .RequestDurationEquals(duration, (x) => (x > 100 && x < 1000))
                     .ResponseStatusCodeEquals(HttpStatusCode.OK)
+                    .ResponseContentTypeEquals("application/json")
                     .ResponseStatusCodeIsSuccess()
                     .AssertAll();
 
-                Assert.Equal(5, assertResults.ToList().Count);
+                Assert.Equal(6, assertResults.ToList().Count);
                 foreach (var result in assertResults)
                 {
                     Assert.True(result.IsTrue, result.Message);

src/QAToolKit.Engine.HttpTester/HttpTestAsserter.cs

@@ -5,6 +5,8 @@
 using System.Collections.Generic;
 using System.Net;
 using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Net.Mime;
 
 namespace QAToolKit.Engine.HttpTester
 {
@@ -59,6 +61,31 @@ public IHttpTestAsserter ResponseContentContains(string keyword, bool caseInsens
 
             return this;
         }
+        
+        /// <summary>
+        /// Check if the response contains specified Content Type
+        /// </summary>
+        /// <param name="contentType"></param>
+        /// <returns></returns>
+        /// <exception cref="ArgumentNullException"></exception>
+        public IHttpTestAsserter ResponseContentTypeEquals(string contentType)
+        {
+            if (contentType == null)
+            {
+                throw new ArgumentNullException($"{nameof(contentType)} is null.");
+            }
+
+            var bodyString = _httpResponseMessage.Content.Headers.ContentType;
+  
+            _assertResults.Add(new AssertResult()
+            {
+                Name = nameof(ResponseContentTypeEquals),
+                Message = $"Response content-type equals '{contentType}'.",
+                IsTrue = _httpResponseMessage.Content.Headers.ContentType.MediaType == contentType
+            });
+
+            return this;
+        }
 
         /// <summary>
         /// Verify request duration

src/QAToolKit.Engine.HttpTester/Interfaces/IHttpTestAsserter.cs

@@ -2,6 +2,7 @@
 using System;
 using System.Collections.Generic;
 using System.Net;
+using System.Net.Http.Headers;
 
 namespace QAToolKit.Engine.HttpTester.Interfaces
 {
@@ -47,6 +48,12 @@ public interface IHttpTestAsserter
         /// <returns></returns>
         IHttpTestAsserter ResponseBodyIsEmpty();
         /// <summary>
+        /// Check if the response contains specified Content Type
+        /// </summary>
+        /// <param name="contentType"></param>
+        /// <returns></returns>
+        IHttpTestAsserter ResponseContentTypeEquals(string contentType);
+        /// <summary>
         /// Return all Assert messages of the Asserter
         /// </summary>
         /// <returns></returns>