Testing

npx @modelcontextprotocol/inspector dotnet run --project ./MyMcpServer

npx @modelcontextprotocol/inspector \
  dotnet run --project ./MyMcpServer -- \
  --some-flag value

using System.IO.Pipelines;
using ModelContextProtocol;
using ModelContextProtocol.Client;
using ModelContextProtocol.Protocol;
using ModelContextProtocol.Server;
using Xunit;

public class WeatherToolsTests
{
    [Fact]
    public async Task GetWeather_returns_text()
    {
        var clientToServer = new Pipe();
        var serverToClient = new Pipe();

        await using var server = McpServer.Create(
            new StreamServerTransport(
                clientToServer.Reader.AsStream(),
                serverToClient.Writer.AsStream()),
            new McpServerOptions
            {
                ToolCollection =
                [
                    McpServerTool.Create(
                        (string city) => $"{city}: 18°C",
                        new() { Name = "GetWeather" })
                ]
            });

        var serverTask = server.RunAsync();

        await using var client = await McpClient.CreateAsync(
            new StreamClientTransport(
                clientToServer.Writer.AsStream(),
                serverToClient.Reader.AsStream()));

        var tools = await client.ListToolsAsync();
        var tool = tools.Single(t => t.Name == "GetWeather");

        var result = await tool.CallAsync(new Dictionary<string, object?>
        {
            ["city"] = "Brussels"
        });

        Assert.False(result.IsError);
        var text = result.Content.OfType<TextContentBlock>().Single().Text;
        Assert.Equal("Brussels: 18°C", text);
    }
}

await using var client = await McpClient.CreateAsync(clientTransport, new McpClientOptions
{
    Capabilities = new()
    {
        Sampling = new()
        {
            SamplingHandler = (req, progress, ct) =>
                Task.FromResult(new CreateMessageResult
                {
                    Content = [new TextContentBlock { Text = "MOCK SUMMARY" }]
                })
        },
        Elicitation = new()
        {
            ElicitationHandler = (req, ct) =>
                Task.FromResult(new ElicitResult
                {
                    Action = "accept",
                    Content = JsonSerializer.SerializeToNode(new { confirm = true })
                                .AsObject().ToDictionary(kv => kv.Key, kv => JsonDocument.Parse(kv.Value!.ToJsonString()).RootElement)
                })
        }
    }
});

[Fact]
public void Echo_prepends_hello()
{
    Assert.Equal("hello world", EchoTool.Echo("world"));
}

- run: dotnet restore
- run: dotnet build --no-restore
- run: dotnet test --no-build --logger "trx;LogFileName=test-results.trx"