Add WireMock.Net.xUnit project (#759)

* WireMock.Net.xunit

* Xunit

* c

* .

* x

src/WireMock.Net.xUnit/TestOutputHelperWireMockLogger.cs

@@ -0,0 +1,79 @@
+using System;
+using Newtonsoft.Json;
+using Stef.Validation;
+using WireMock.Admin.Requests;
+using WireMock.Logging;
+using Xunit.Abstractions;
+
+namespace WireMock.Net.Xunit;
+
+/// <summary>
+/// When using xUnit, this class enables to log the output from WireMock.Net to the <see cref="ITestOutputHelper"/>.
+/// </summary>
+public sealed class TestOutputHelperWireMockLogger : IWireMockLogger
+{
+    private readonly ITestOutputHelper _testOutputHelper;
+
+    /// <summary>
+    /// Create a new instance on the <see cref="TestOutputHelperWireMockLogger"/>.
+    /// </summary>
+    /// <param name="testOutputHelper">Represents a class which can be used to provide test output.</param>
+    public TestOutputHelperWireMockLogger(ITestOutputHelper testOutputHelper)
+    {
+        _testOutputHelper = Guard.NotNull(testOutputHelper);
+    }
+
+    /// <inheritdoc />
+    public void Debug(string formatString, params object[] args)
+    {
+        _testOutputHelper.WriteLine(Format("Debug", formatString, args));
+    }
+
+    /// <inheritdoc />
+    public void Info(string formatString, params object[] args)
+    {
+        _testOutputHelper.WriteLine(Format("Info", formatString, args));
+    }
+
+    /// <inheritdoc />
+    public void Warn(string formatString, params object[] args)
+    {
+        _testOutputHelper.WriteLine(Format("Warning", formatString, args));
+    }
+
+    /// <inheritdoc />
+    public void Error(string formatString, params object[] args)
+    {
+        _testOutputHelper.WriteLine(Format("Error", formatString, args));
+    }
+
+    /// <inheritdoc />
+    public void Error(string formatString, Exception exception)
+    {
+        _testOutputHelper.WriteLine(Format("Error", formatString, exception.Message));
+
+        if (exception is AggregateException ae)
+        {
+            ae.Handle(ex =>
+            {
+                _testOutputHelper.WriteLine(Format("Error", "Exception {0}", ex.Message));
+                return true;
+            });
+        }
+    }
+
+    /// <inheritdoc />
+    public void DebugRequestResponse(LogEntryModel logEntryModel, bool isAdminRequest)
+    {
+        var message = JsonConvert.SerializeObject(logEntryModel, Formatting.Indented);
+        _testOutputHelper.WriteLine(Format("DebugRequestResponse", "Admin[{0}] {1}", isAdminRequest, message));
+    }
+
+    private static string Format(string level, string formatString, params object[] args)
+    {
+        Guard.NotNull(formatString);
+
+        var message = args.Length > 0 ? string.Format(formatString, args) : formatString;
+        return $"{DateTime.UtcNow} [{level}] : {message}";
+    }
+}