Add ObjectAssertions.WithDeclaredType.

Author: faddiv

src/FluentAssertions.AspNetCore.Mvc/ObjectResultAssertionsBase.cs

@@ -122,21 +122,45 @@ public TObjectResultAssertion ContainsFormatter(Expression<Func<IOutputFormatter
         /// </param>
         public TObjectResultAssertion WithContentType(string expected, string reason = "", params object[] reasonArgs)
         {
-            var formatters = ObjectResultSubject.ContentTypes;
+            var contentTypes = ObjectResultSubject.ContentTypes;
 
-            if (formatters is null)
+            if (contentTypes is null)
             {
                 Execute.Assertion
                     .BecauseOf(reason, reasonArgs)
                     .WithDefaultIdentifier(Identifier + ".ContentTypes")
-                    .FailWith("Expected {context} to contain {0}{reason} but found {1}.", expected, formatters);
+                    .FailWith("Expected {context} to contain {0}{reason} but found {1}.", expected, contentTypes);
             }
 
             Execute.Assertion
-                .ForCondition(formatters.Contains(expected))
+                .ForCondition(contentTypes.Contains(expected))
                 .WithDefaultIdentifier(Identifier + ".ContentTypes")
                 .BecauseOf(reason, reasonArgs)
-                .FailWith("Expected {context} {0} to contain {1}{reason}.", formatters, expected);
+                .FailWith("Expected {context} {0} to contain {1}{reason}.", contentTypes, expected);
+
+            return (TObjectResultAssertion)this;
+        }
+
+        /// <summary>
+        /// Asserts that the <see cref="ObjectResult.DeclaredType"/> contains the specified content type.
+        /// </summary>
+        /// <param name="expected">The expectation content type.</param>
+        /// <param name="reason">
+        ///     A formatted phrase as is supported by <see cref="string.Format(string,object[])" /> explaining why the assertion
+        ///     is needed. If the phrase does not start with the word <i>because</i>, it is prepended automatically.
+        /// </param>
+        /// <param name="reasonArgs">
+        ///     Zero or more objects to format using the placeholders in <paramref name="reason"/>.
+        /// </param>
+        public TObjectResultAssertion WithDeclaredType(Type expected, string reason = "", params object[] reasonArgs)
+        {
+            var actual = ObjectResultSubject.DeclaredType;
+
+            Execute.Assertion
+                .ForCondition(expected == actual)
+                .WithDefaultIdentifier(Identifier + ".DeclaredType")
+                .BecauseOf(reason, reasonArgs)
+                .FailWith(FailureMessages.CommonTypeFailMessage, expected, actual);
 
             return (TObjectResultAssertion)this;
         }

tests/FluentAssertions.AspNetCore.Mvc.Tests/ActionResultAssertions_Tests.cs

@@ -27,7 +27,7 @@ public void BeContent_GivenContent_ShouldPass()
         public void BeContent_GivenNotContent_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(ContentResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(ContentResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeContentResult(Reason, ReasonArgs);
 
@@ -47,7 +47,7 @@ public void BeEmpty_GivenEmpty_ShouldPass()
         public void BeEmpty_GivenNotEmpty_ShouldPass()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(EmptyResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(EmptyResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeEmptyResult(Reason, ReasonArgs);
 
@@ -68,7 +68,7 @@ public void BeFileResult_GivenFileResult_ShouldPass()
         public void BeFileResult_GivenNotFileResult_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(FileResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(FileResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeFileResult(Reason, ReasonArgs);
 
@@ -89,7 +89,7 @@ public void BeFileContentResult_GivenFileContentResult_ShouldPass()
         public void BeFileContentResult_GivenNotFileContentResult_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(FileContentResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(FileContentResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeFileContentResult(Reason, ReasonArgs);
 
@@ -110,7 +110,7 @@ public void BeFileStreamResult_GivenFileStreamResult_ShouldPass()
         public void BeFileStreamResult_GivenNotFileStreamResult_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(FileStreamResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(FileStreamResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeFileStreamResult(Reason, ReasonArgs);
 
@@ -131,7 +131,7 @@ public void BePhysicalFileResult_GivenPhysicalFileResult_ShouldPass()
         public void BePhysicalFileResult_GivenNotPhysicalFileResult_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(PhysicalFileResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(PhysicalFileResult), typeof(ViewResult));
 
             Action a = () => result.Should().BePhysicalFileResult(Reason, ReasonArgs);
 
@@ -152,7 +152,7 @@ public void BeVirtualFileResult_GivenVirtualFileResult_ShouldPass()
         public void BeVirtualFileResult_GivenNotVirtualFileResult_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(VirtualFileResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(VirtualFileResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeVirtualFileResult(Reason, ReasonArgs);
 
@@ -174,7 +174,7 @@ public void BeJson_GivenJson_ShouldPass()
         public void BeJson_GivenNotJson_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(JsonResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(JsonResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeJsonResult(Reason, ReasonArgs);
 
@@ -194,7 +194,7 @@ public void BeRedirectToRoute_GivenRedirectToRoute_ShouldPass()
         public void BeRedirectToRoute_GivenNotRedirectToRoute_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(RedirectToRouteResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(RedirectToRouteResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeRedirectToRouteResult(Reason, ReasonArgs);
 
@@ -214,7 +214,7 @@ public void BeRedirect_GivenRedirect_ShouldPass()
         public void BeRedirect_GivenNotRedirect_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(RedirectResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(RedirectResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeRedirectResult(Reason, ReasonArgs);
 
@@ -234,7 +234,7 @@ public void BePartialView_GivenPartial_ShouldPass()
         public void BePartialView_GivenNotPartial_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(PartialViewResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(PartialViewResult), typeof(ViewResult));
 
             Action a = () => result.Should().BePartialViewResult(Reason, ReasonArgs);
 
@@ -254,7 +254,7 @@ public void BeView_GivenView_ShouldPass()
         public void BeView_GivenNotView_ShouldFail()
         {
             ActionResult result = new RedirectResult("/");
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(ViewResult), typeof(RedirectResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(ViewResult), typeof(RedirectResult));
 
             Action a = () => result.Should().BeViewResult(Reason, ReasonArgs);
 
@@ -274,7 +274,7 @@ public void BeStatusCodeResult_GivenStatusCodeResult_ShouldPass()
         public void BeStatusCodeResult_GivenNotStatusCodeResult_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(StatusCodeResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(StatusCodeResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeStatusCodeResult(Reason, ReasonArgs);
 
@@ -294,7 +294,7 @@ public void BeObjectResult_GivenObjectResult_ShouldPass()
         public void BeObjectResult_GivenNotObjectResult_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(ObjectResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(ObjectResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeObjectResult(Reason, ReasonArgs);
 
@@ -314,7 +314,7 @@ public void BeOkResult_GivenOk_ShouldPass()
         public void BeOkResult_GivenNotOk_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(OkResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(OkResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeOkResult(Reason, ReasonArgs);
 
@@ -334,7 +334,7 @@ public void BeBadRequestResult_GivenBadRequest_ShouldPass()
         public void BeBadRequestResult_GivenNotBadRequest_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(BadRequestResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(BadRequestResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeBadRequestResult(Reason, ReasonArgs);
 
@@ -354,7 +354,7 @@ public void BeChallengeResult_GivenChallengeResult_ShouldPass()
         public void BeChallengeResult_GivenNotChallengeResult_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(ChallengeResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(ChallengeResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeChallengeResult(Reason, ReasonArgs);
 
@@ -373,7 +373,7 @@ public void BeAcceptedResult_GivenAccepted_ShouldPass()
         public void BeAcceptedResult_GivenNotAccepted_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(AcceptedResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(AcceptedResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeAcceptedResult(Reason, ReasonArgs);
 
@@ -393,7 +393,7 @@ public void BeNoContentResult_GivenNoContent_ShouldPass()
         public void BeNoContentResult_GivenNotNoContent_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(NoContentResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(NoContentResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeNoContentResult(Reason, ReasonArgs);
 
@@ -413,7 +413,7 @@ public void BeNotFoundResult_GivenNotFound_ShouldPass()
         public void BeNotFoundResult_GivenNotNotFound_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(NotFoundResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(NotFoundResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeNotFoundResult(Reason, ReasonArgs);
 
@@ -433,7 +433,7 @@ public void BeUnauthorizedResult_GivenUnauthorized_ShouldPass()
         public void BeUnauthorizedResult_GivenNotUnauthorized_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(UnauthorizedResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(UnauthorizedResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeUnauthorizedResult(Reason, ReasonArgs);
 
@@ -453,7 +453,7 @@ public void BeSignOutResult_GivenSignOutResult_ShouldPass()
         public void BeSignOutResult_GivenNotSignOutResult_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(SignOutResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(SignOutResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeSignOutResult(Reason, ReasonArgs);
 
@@ -474,7 +474,7 @@ public void BeLocalRedirectResult_GivenLocalRedirectResult_ShouldPass()
         public void BeLocalRedirectResult_GivenNotLocalRedirectResult_ShouldFail()
         {
             ActionResult result = new ViewResult();
-            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundY("result", typeof(LocalRedirectResult), typeof(ViewResult));
+            var failureMessage = FailureMessageHelper.ExpectedContextTypeXButFoundYWithReason("result", typeof(LocalRedirectResult), typeof(ViewResult));
 
             Action a = () => result.Should().BeLocalRedirectResult(Reason, ReasonArgs);