Add WithProbability (#922)

* WithProbability

* fix

* x

* ,

* .

* .

* .

src/WireMock.Net/Server/IRespondWithAProvider.cs

@@ -175,5 +175,13 @@ public interface IRespondWithAProvider
     /// lookup data "1"
     /// </example>
     /// </summary>
+    /// <returns>The <see cref="IRespondWithAProvider"/>.</returns>
     IRespondWithAProvider WithData(object data);
+
+    /// <summary>
+    /// Define the probability when this request should be matched. Value is between 0 and 1.
+    /// </summary>
+    /// <param name="probability">The probability when this request should be matched. Value is between 0 and 1.</param>
+    /// <returns>The <see cref="IRespondWithAProvider"/>.</returns>
+    IRespondWithAProvider WithProbability(double probability);
 }

src/WireMock.Net/Server/RespondWithAProvider.cs

@@ -18,6 +18,12 @@ namespace WireMock.Server;
 /// </summary>
 internal class RespondWithAProvider : IRespondWithAProvider
 {
+    private readonly RegistrationCallback _registrationCallback;
+    private readonly IRequestMatcher _requestMatcher;
+    private readonly WireMockServerSettings _settings;
+    private readonly IDateTimeUtils _dateTimeUtils;
+    private readonly bool _saveToFile;
+
     private int _priority;
     private string? _title;
     private string? _description;
@@ -26,13 +32,8 @@ internal class RespondWithAProvider : IRespondWithAProvider
     private string? _nextState;
     private string? _scenario;
     private int _timesInSameState = 1;
-    private readonly RegistrationCallback _registrationCallback;
-    private readonly IRequestMatcher _requestMatcher;
-    private readonly WireMockServerSettings _settings;
-    private readonly IDateTimeUtils _dateTimeUtils;
-    private readonly bool _saveToFile;
-
     private bool? _useWebhookFireAndForget;
+    private double? _probability;
 
     public Guid Guid { get; private set; }
 
@@ -92,7 +93,8 @@ internal class RespondWithAProvider : IRespondWithAProvider
             Webhooks,
             _useWebhookFireAndForget,
             TimeSettings,
-            Data);
+            Data,
+            _probability);
 
         _registrationCallback(mapping, _saveToFile);
     }
@@ -285,6 +287,13 @@ internal class RespondWithAProvider : IRespondWithAProvider
         return this;
     }
 
+    public IRespondWithAProvider WithProbability(double probability)
+    {
+        _probability = Guard.Condition(probability, p => p is >= 0 and <= 1.0);
+
+        return this;
+    }
+
     private static IWebhook InitWebhook(
         string url,
         string method,

src/WireMock.Net/Server/WireMockServer.ConvertMapping.cs

@@ -113,6 +113,11 @@ public partial class WireMockServer
             respondProvider.WithWebhookFireAndForget(mappingModel.UseWebhooksFireAndForget.Value);
         }
 
+        if (mappingModel.Probability != null)
+        {
+            respondProvider.WithProbability(mappingModel.Probability.Value);
+        }
+
         var responseBuilder = InitResponseBuilder(mappingModel.Response);
         respondProvider.RespondWith(responseBuilder);