[WIP] Create a custom Logger to gather the data from the test run

.gitignore

@@ -6,4 +6,5 @@ npm-debug.log
 yarn.*
 [Bb]in/
 [Oo]bj/
-lcov.info
+lcov.info
+logger/publish/

logger/VscodeLogger.cs

@@ -0,0 +1,87 @@
+using System.Linq;
+using System;
+using System.Net.Sockets;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+
+using Microsoft.VisualStudio.TestPlatform.ObjectModel;
+using Microsoft.VisualStudio.TestPlatform.ObjectModel.Client;
+using System.Collections.Generic;
+
+namespace VscodeTestExplorer.Logger;
+
+[FriendlyName("VsCodeLogger")]
+[ExtensionUri("this://is/a/random/path/that/vstest/apparently/expects/whatever/VscodeLogger")]
+public class VsCodeLogger : ITestLoggerWithParameters
+{
+    int port;
+    public void Initialize(TestLoggerEvents events, string testRunDirectory) { }
+    public void Initialize(TestLoggerEvents events, Dictionary<string, string> parameters)
+    {
+        Console.WriteLine(parameters.Count);
+        foreach (var kvp in parameters)
+            Console.WriteLine($"{kvp.Key}: {kvp.Value}");
+
+        port = int.Parse(parameters["port"]);
+        Console.WriteLine($"Data collector initialized; writing to port {port}.");
+
+        events.TestRunStart += (sender, e) => StartSendJson(new { type = "testRunStarted" });
+        events.TestRunComplete += (sender, e) =>
+        {
+            StartSendJson(new { type = "testRunComplete" });
+            Flush();
+        };
+
+        events.DiscoveredTests += (sender, e)
+            => StartSendJson(new
+            {
+                type = "discovery",
+                discovered = e.DiscoveredTestCases.Select(GetFullName).ToArray()
+            });
+        events.DiscoveryComplete += (sender, e) => Flush();
+
+        events.TestResult += (sender, e) => StartSendJson(new
+        {
+            type = "result",
+            fullName = GetFullName(e.Result.TestCase),
+            outcome = e.Result.Outcome.ToString(),
+            message = e.Result.ErrorMessage,
+            stackTrace = e.Result.ErrorStackTrace,
+        });
+    }
+
+    static string GetFullName(TestCase testCase)
+        => testCase.GetProperties().Any(kvp => kvp.Key.Id == "XunitTestCase") ?
+            testCase.DisplayName : testCase.FullyQualifiedName;
+
+    async Task SendString(string str)
+    {
+        // Console.WriteLine("Sending: " + str);
+
+        using TcpClient client = new TcpClient();
+        await client.ConnectAsync("localhost", port);
+        await client.GetStream().WriteAsync(Encoding.UTF8.GetBytes(str));
+    }
+
+    List<Task> tasks = new List<Task>();
+    void StartSendJson<T>(T obj)
+    {
+        var task = SendString(JsonSerializer.Serialize(obj));
+        lock (tasks)
+        {
+            tasks.Add(task);
+        }
+    }
+
+    void Flush()
+    {
+        Task[] _tasks;
+        lock (tasks)
+        {
+            _tasks = tasks.ToArray();
+            tasks.Clear();
+        }
+        Task.WaitAll(_tasks);
+    }
+}

logger/VscodeTestExplorer.testlogger.csproj

@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <LangVersion>10.0</LangVersion>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="16.6.1" />
+  </ItemGroup>
+
+</Project>