TypeLoadException when using WithHeader method.

[eshref]

Hi, friends.

I am getting

System.TypeLoadException
Could not load type 'FluentAssertions.Collections.SelfReferencingCollectionAssertions`2' from assembly 'FluentAssertions, Version=6.6.0.0, Culture=neutral, PublicKeyToken=33f2691a05b67b6a'.
   at WireMock.FluentAssertions.WireMockAssertions.WithHeader(String expectedKey, String[] expectedValues, String because, Object[] becauseArgs)

error when I use below assertion code in my test which is net472 project.

_wireMockServer
                .Should()
                .HaveReceivedACall()
                .AtAbsoluteUrl("some-url").And
                .WithHeader("header-name", "header-value");

I am using below versions of packages in test project.

Any help is appreciated.

[StefH]

Can you please provide the full project ?

[StefH]

@eshref
Can you please provide a full project with this error?

[eshref]

Hi, @StefH. Sorry for late response.

Here is my csproj:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net472</TargetFramework>
    <NoWarn>0067</NoWarn>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="WireMock.Net" Version="1.5.13" />
    <PackageReference Include="FluentAssertions" Version="6.6.0" />
    <PackageReference Include="WireMock.Net.FluentAssertions" Version="1.5.13" />
        <PackageReference Include="WireMock.Net.FluentAssertions" Version="1.5.13" />
    <PackageReference Include="xunit" Version="2.4.2" />
    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      <PrivateAssets>all</PrivateAssets>
    </PackageReference>
    <PackageReference Include="coverlet.collector" Version="3.2.0">
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      <PrivateAssets>all</PrivateAssets>
    </PackageReference>
  </ItemGroup>

</Project>

And this is test class:

using System;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;

using FluentAssertions;

using WireMock.FluentAssertions;
using WireMock.RequestBuilders;
using WireMock.ResponseBuilders;
using WireMock.Server;

using Xunit;


namespace TestProject1
{
    public class UnitTest1 : IDisposable
    {
        private readonly WireMockServer _wireMockServer;


        public UnitTest1()
        {
            _wireMockServer = WireMockServer.Start(8081);
        }


        public void Dispose()
        {
            _wireMockServer.Stop();
            _wireMockServer.Dispose();
        }


        [Fact]
        public async Task Test1()
        {
            // arrange
            var httpClient = new HttpClient();

            _wireMockServer.Given(
                    Request.Create()
                        .WithPath("/someurl")
                        .UsingPost())
                .RespondWith(
                    Response.Create()
                        .WithStatusCode(HttpStatusCode.OK));

            // act
            var httpRequestMessage = new HttpRequestMessage(HttpMethod.Post, "http://localhost:8081/someurl")
            {
                Headers =
                {
                    { "header-name", "header-value" }
                }
            };

            HttpResponseMessage response = await httpClient.SendAsync(httpRequestMessage);

            // assert
            response.StatusCode.Should().Be(HttpStatusCode.OK);

            _wireMockServer
                .Should()
                .HaveReceivedACall()
                .AtAbsoluteUrl("http://localhost:8081/someurl").And
                .WithHeader("header-name", "header-value");
        }
    }
}

[StefH]

Using your slightly modified csproj and the same test file it works fine in VS2022.

<Project Sdk="Microsoft.NET.Sdk">

    <PropertyGroup>
        <TargetFramework>net472</TargetFramework>
        <NoWarn>0067</NoWarn>
    </PropertyGroup>

    <ItemGroup>
        <PackageReference Include="WireMock.Net" Version="1.5.13" />
        <PackageReference Include="WireMock.Net.FluentAssertions" Version="1.5.13" />
        <PackageReference Include="xunit" Version="2.4.2" />
        <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
            <PrivateAssets>all</PrivateAssets>
        </PackageReference>
        <PackageReference Include="coverlet.collector" Version="3.2.0">
            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
            <PrivateAssets>all</PrivateAssets>
        </PackageReference>
    </ItemGroup>

</Project>

[eshref]

Why you removed FluentAssertions 6.6.0? We use this version of FA package.

[StefH]

Ah I see. That causes probably the issue.

Version 5 and 6 from FluentAssertions are not compatible.

The only thing what can be done is that I create 2 packages for WireMock.Net.FluentAssertions, one with 5 and one with 6.

[eshref]

Wouldn't it be better to to upgrade FA dependency and release new breaking change instead of supporting two packages?

[StefH]

The issue is that version 6 is not supported by lower frameworks. But I can make a workaround for that I think.

[StefH]

Can you try preview version 1.5.26-ci-17452 ?

[eshref]

Did you push this version to nuget? I am getting below warnings after manually updating versions:

warning NU1603: TestProject1 depends on WireMock.Net (>= 1.5.26-ci-17452) but WireMock.Net 1.5.26-ci-17452 was not found. An approximate best match of WireMock.Net 1.5.26 was resolved.
warning NU1603: TestProject1 depends on WireMock.Net.FluentAssertions (>= 1.5.26-ci-17452) but WireMock.Net.FluentAssertions 1.5.26-ci-17452 was not found. An approximate best match of WireMock.Net.FluentAssertions 1.5.26 was resolved.

[StefH]

It is on myget.

https://github.com/WireMock-Net/WireMock.Net/wiki/MyGet-preview-versions

[eshref]

Added this package and run test, same problem occured.

[StefH]

Can you try
1.5.26-ci-17457

[eshref]

This one worked, thanks. 🙏🏼

[eshref]

I would be glad, if you share solution :)

[StefH]

I would be glad, if you share solution :)

You mean a new official NuGet ?

[eshref]

I would be glad, if you share solution :)

You mean a new official NuGet ?

Yes, but also I meant what changes did you do in this myget package? Only above changes (#949)

[StefH]

That commit was actually not correct.

I did a commit op master which solved it.

[eshref]

Thanks for your quick help.