[Feature]: Add first-class support for classes like Azure SDK concrete clients in TUnit.Mocks

[dukedagmor]

Problem Statement

Findings

When migrating from Moq to Tunit.Mocks I encountered the following issue. Since this isn't supported yet, I made this a feature request and not a bug.

Mocking concrete Azure.Data.Tables.TableClient is not supported in Tunit but is in Moq. This complicates the migration.

For now we use Tunit.Mocks 'where possible'

Reproduction

#:property LangVersion=preview
#:property ManagePackageVersionsCentrally=false
#:package TUnit.Mocks@1.21.30
#:package Azure.Data.Tables@12.11.0
#:package Azure.Storage.Blobs@12.27.0

using Azure.Data.Tables;
using Azure.Storage.Blobs;

var tableClientMock = Mock.OfPartial<TableClient>(MockBehavior.Strict);
var blobClientMock = Mock.OfPartial<BlobClient>(MockBehavior.Strict);

Console.WriteLine($"Created: {tableClientMock.Object.GetType().Name}, {blobClientMock.Object.GetType().Name}");

dotnet run .\test-compat\tunit-mocks-azure-concrete-repro.cs

Expected result

The build fails in TUnit.Mocks generated files when mocking Azure concrete clients (TableClient, BlobClient), with errors like:

• CS0460 (constraints on overrides)
• CS0115 (no suitable method to override)
• CS0122 (inaccessible members)

Proposed Solution

Idealy it would work like moq does now, that decreases friction when migrating. If this is wholly undesired a decision needs to be made if support + warning is valid or no support at all is better to keep people from implementing this as path of least resistance.

moq example

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net10.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
    <ManagePackageVersionsCentrally>false</ManagePackageVersionsCentrally>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Moq" Version="4.20.72" />
    <PackageReference Include="Azure.Data.Tables" Version="12.11.0" />
    <PackageReference Include="Azure.Storage.Blobs" Version="12.27.0" />
  </ItemGroup>
</Project>

using Azure.Data.Tables;
using Azure.Storage.Blobs;
using Moq;

var tableClientMock = new Mock<TableClient>(MockBehavior.Strict);
var blobClientMock = new Mock<BlobClient>(MockBehavior.Strict);

Console.WriteLine($"Created: {tableClientMock.Object.GetType().Name}, {blobClientMock.Object.GetType().Name}");

Alternatives Considered

No response

Feature Category

Other

How important is this feature to you?

Nice to have - would improve my experience

Additional Context

No response

Contribution

• I'm willing to submit a pull request for this feature