Add more tests

Author: sander1095

src/Mvc/Mvc.ApiExplorer/test/ApiResponseTypeProviderTest.cs

@@ -186,6 +186,66 @@ public void GetApiResponseTypes_ReturnsResponseTypesFromApiConventionItem()
            });
     }
 
+    [Fact]
+    public void GetApiResponseTypes_ReturnsDescriptionFromProducesResponseType()
+    {
+        // Arrange
+
+        const string expectedOkDescription = "All is well";
+        const string expectedBadRequestDescription = "Invalid request";
+        const string expectedNotFoundDescription = "Something was not found";
+
+        var actionDescriptor = GetControllerActionDescriptor(
+            typeof(GetApiResponseTypes_ReturnsResponseTypesFromDefaultConventionsController),
+            nameof(GetApiResponseTypes_ReturnsResponseTypesFromDefaultConventionsController.DeleteBase));
+
+        actionDescriptor.Properties[typeof(ApiConventionResult)] = new ApiConventionResult(new[]
+        {
+                new ProducesResponseTypeAttribute(200) { Description = expectedOkDescription},
+                new ProducesResponseTypeAttribute(400) { Description = expectedBadRequestDescription },
+                new ProducesResponseTypeAttribute(404) { Description = expectedNotFoundDescription },
+            });
+
+        var provider = GetProvider();
+
+        // Act
+        var result = provider.GetApiResponseTypes(actionDescriptor);
+
+        // Assert
+        Assert.Collection(
+           result.OrderBy(r => r.StatusCode),
+           responseType =>
+           {
+               Assert.Equal(200, responseType.StatusCode);
+               Assert.Equal(typeof(BaseModel), responseType.Type);
+               Assert.False(responseType.IsDefaultResponse);
+               Assert.Equal(expectedOkDescription, responseType.Description);
+               Assert.Collection(
+                    responseType.ApiResponseFormats,
+                    format =>
+                    {
+                        Assert.Equal("application/json", format.MediaType);
+                        Assert.IsType<TestOutputFormatter>(format.Formatter);
+                    });
+           },
+           responseType =>
+           {
+               Assert.Equal(400, responseType.StatusCode);
+               Assert.Equal(typeof(void), responseType.Type);
+               Assert.False(responseType.IsDefaultResponse);
+               Assert.Empty(responseType.ApiResponseFormats);
+               Assert.Equal(expectedBadRequestDescription, responseType.Description);
+           },
+           responseType =>
+           {
+               Assert.Equal(404, responseType.StatusCode);
+               Assert.Equal(typeof(void), responseType.Type);
+               Assert.False(responseType.IsDefaultResponse);
+               Assert.Empty(responseType.ApiResponseFormats);
+               Assert.Equal(expectedNotFoundDescription, responseType.Description);
+           });
+    }
+
     [ApiConventionType(typeof(DefaultApiConventions))]
     public class GetApiResponseTypes_ReturnsResponseTypesFromDefaultConventionsController : ControllerBase
     {