add: 检测递归转移单元测试

Katheryne.Tests/Katheryne/Grammar3/grammar.yaml

@@ -0,0 +1,22 @@
+robotName: 啊准
+stages:
+  - name: start
+    answer: 我是啊准，一个可以查询天气的机器人。
+    transformers:
+      - pattern: .*?天气|气温.*?
+        nextStageName: weather
+      - pattern: .*?
+        nextStageName: running
+
+  - name: running
+    answer: 对不起，做不到。
+    transformers:
+      - pattern:
+        nextStageName: running
+
+  - name: weather
+    answer: 今天北京市的天气是@weather/text，气温是@weather/temp 摄氏度。
+    transformers:
+      - pattern:
+        nextStageName: running
+beginStageName: start

Katheryne.Tests/Katheryne/Grammar3/in.txt

@@ -0,0 +1,2 @@
+今天北京的天气怎么样？
+你说的对，但是

Katheryne.Tests/Katheryne/Grammar3/out.txt

@@ -0,0 +1,6 @@
+我是啊准，一个可以查询天气的机器人。
+今天北京市的天气是晴，气温是20 摄氏度。
+我是啊准，一个可以查询天气的机器人。
+对不起，做不到。
+我是啊准，一个可以查询天气的机器人。
+再见。

Katheryne.Tests/Katheryne/KatheryneRobotTests.cs

@@ -1,6 +1,8 @@
 using Katheryne.Abstractions;
+using Katheryne.Exceptions;
 using Katheryne.Modules;
 using Katheryne.Services;
+using Katheryne.Tests.Mocks;
 using Microsoft.Extensions.Logging;
 using Moq;
 
@@ -57,6 +59,21 @@ public class KatheryneRobotTests
         ValidateOutput(_katheryneChatRobotFactory.GetRobot(), file);
     }
 
+    [Fact]
+    public void RecursivelyExceptionTest()
+    {
+        IParamsModule weatherModule = new MockWeatherModule();
+        _katheryneChatRobotFactory.Modules.Clear();
+        _katheryneChatRobotFactory.Modules.Add(weatherModule.ModuleName, weatherModule);
+
+        InputOutputFile file = new("Grammar3");
+        StreamReader reader = new(Path.Combine(file.PrefixPath, "grammar.yaml"));
+        _katheryneChatRobotFactory.SetGrammar(reader.ReadToEnd());
+
+        Assert.Throws<GrammarException>(
+            () => ValidateOutput(_katheryneChatRobotFactory.GetRobot(), file));
+    }
+
     [Fact]
     public void WeatherModuleTest()
     {

Katheryne.Tests/Mocks/MockWeatherModule.cs

@@ -0,0 +1,21 @@
+using Katheryne.Abstractions;
+
+namespace Katheryne.Tests.Mocks;
+
+public class MockWeatherModule : IParamsModule
+{
+    private readonly Dictionary<string, string> _param = new()
+    {
+        { "temp", "20" },
+        { "text", "晴" }
+    };
+
+    public string ModuleName => "weather";
+
+    public string this[string param] => _param[param];
+
+    public bool ContainsParam(string param)
+    {
+        return _param.ContainsKey(param);
+    }
+}