Add unit tests for ToCamelCaseWithNamespace method

Co-authored-by: enisn <23705418+enisn@users.noreply.github.com>

framework/test/Volo.Abp.Cli.Core.Tests/Volo/Abp/Cli/ProjectBuilding/Building/Steps/SolutionRenamer_Tests.cs

@@ -0,0 +1,87 @@
+using Shouldly;
+using System.Collections.Generic;
+using System.Reflection;
+using Volo.Abp.Cli.ProjectBuilding.Files;
+using Xunit;
+
+namespace Volo.Abp.Cli.ProjectBuilding.Building.Steps;
+
+public class SolutionRenamer_Tests
+{
+    [Theory]
+    [InlineData("Demo", "demo")]
+    [InlineData("MyCompany", "myCompany")]
+    [InlineData("Acme", "acme")]
+    [InlineData("ABC", "aBC")]
+    public void ToCamelCaseWithNamespace_Should_Handle_Single_Segment_Names(string input, string expected)
+    {
+        // Act
+        var result = InvokeToCamelCaseWithNamespace(input);
+
+        // Assert
+        result.ShouldBe(expected);
+    }
+
+    [Theory]
+    [InlineData("Demo.App", "demo.app")]
+    [InlineData("MyCompany.MyProject", "myCompany.myProject")]
+    [InlineData("Acme.Bookstore", "acme.bookstore")]
+    [InlineData("ABC.XYZ", "aBC.xYZ")]
+    public void ToCamelCaseWithNamespace_Should_Handle_Two_Segment_Names(string input, string expected)
+    {
+        // Act
+        var result = InvokeToCamelCaseWithNamespace(input);
+
+        // Assert
+        result.ShouldBe(expected);
+    }
+
+    [Theory]
+    [InlineData("Demo.App.QoL", "demo.app.qoL")]
+    [InlineData("MyCompany.MyProject.Module", "myCompany.myProject.module")]
+    [InlineData("Acme.Bookstore.Application", "acme.bookstore.application")]
+    [InlineData("A.B.C.D", "a.b.c.d")]
+    public void ToCamelCaseWithNamespace_Should_Handle_Multi_Segment_Names(string input, string expected)
+    {
+        // Act
+        var result = InvokeToCamelCaseWithNamespace(input);
+
+        // Assert
+        result.ShouldBe(expected);
+    }
+
+    [Theory]
+    [InlineData("", "")]
+    [InlineData("A", "a")]
+    [InlineData(".", ".")]
+    [InlineData("...", "...")]
+    public void ToCamelCaseWithNamespace_Should_Handle_Edge_Cases(string input, string expected)
+    {
+        // Act
+        var result = InvokeToCamelCaseWithNamespace(input);
+
+        // Assert
+        result.ShouldBe(expected);
+    }
+
+    [Fact]
+    public void ToCamelCaseWithNamespace_Should_Throw_On_Null_Input()
+    {
+        // Act & Assert
+        var exception = Should.Throw<System.Reflection.TargetInvocationException>(() => InvokeToCamelCaseWithNamespace(null));
+        exception.InnerException.ShouldBeOfType<System.NullReferenceException>();
+    }
+
+    /// <summary>
+    /// Helper method to invoke the private static ToCamelCaseWithNamespace method using reflection
+    /// </summary>
+    private static string InvokeToCamelCaseWithNamespace(string input)
+    {
+        var type = typeof(SolutionRenamer);
+        var method = type.GetMethod("ToCamelCaseWithNamespace", BindingFlags.NonPublic | BindingFlags.Static);
+        
+        method.ShouldNotBeNull("ToCamelCaseWithNamespace method should exist");
+        
+        return (string)method.Invoke(null, new object[] { input });
+    }
+}