inherit case bug fixed.

Author: sang-hyeon

src/PlasticCommand.UnitTests/TestCommands/AttributesCommandSpec.cs

@@ -4,7 +4,7 @@
 namespace PlasticCommand.UnitTests.TestCommands;
 
 [PlasticCommand(GeneratedCommandName = "AAACommand", GroupName = "AGroupCommands")]
-public class AttributesCommandSpec : ICommandSpecification<int, int>
+internal class AttributesCommandSpec : ICommandSpecification<int, int>
 {
     public Task<int> ExecuteAsync(int param, CancellationToken token = default)
     {

src/PlasticCommand.UnitTests/TestCommands/InheritCommandSpec.cs

@@ -14,6 +14,7 @@ public Task<int> ExecuteAsync(int param, CancellationToken token = default)
     protected abstract Task<int> Execute();
 }
 
+[PlasticCommand(GroupName = "AGroupCommands")]
 public class InheritCommandSpec : InheritCommandSpecBase
 {
     /// <summary>

src/PlasticCommand/Generator/Analysis/PlasticCommandAttributeAnalyzer.cs

@@ -1,4 +1,6 @@
 using Microsoft.CodeAnalysis;
+using System.Collections.Generic;
+using System.Collections.Immutable;
 using System.Linq;
 
 namespace PlasticCommand.Generator.Analysis;
@@ -17,10 +19,11 @@ public static (string? CommandName, string? GroupName) Analyze(
 
         string commandNameArg = nameof(PlasticCommandAttribute.GeneratedCommandName);
         string groupNameArg = nameof(PlasticCommandAttribute.GroupName);
+        ImmutableArray<KeyValuePair<string, TypedConstant>>? attributeArgs = commandNameAtt?.NamedArguments;
 
         return (
-            (string?)commandNameAtt?.NamedArguments.Single(q => q.Key == commandNameArg).Value.Value,
-            (string?)commandNameAtt?.NamedArguments.Single(q => q.Key == groupNameArg).Value.Value
+            (string?)attributeArgs?.SingleOrDefault(q => q.Key == commandNameArg).Value.Value,
+            (string?)attributeArgs?.SingleOrDefault(q => q.Key == groupNameArg).Value.Value
             );
     }
 }