Fix Issue #1017 and refactoring Mapster.Tool for ease of testing

src/Mapster.Tool.Tests/Helpers/ConfigHelpers.cs

@@ -0,0 +1,11 @@
+using System.Reflection;
+
+namespace Mapster.Tool.Tests.Helpers
+{
+    internal static class ConfigHelpers
+    {
+        internal static MapperOptions optMappers => new MapperOptions() { Assembly = Assembly.GetExecutingAssembly().Location, Output = Path.GetTempPath() };
+        internal static ModelOptions optModels = new ModelOptions() { Assembly = Assembly.GetExecutingAssembly().Location, Output = Path.GetTempPath() };
+        internal static ExtensionOptions optExtentions = new ExtensionOptions() { Assembly = Assembly.GetExecutingAssembly().Location, Output = Path.GetTempPath() };
+    }
+}

src/Mapster.Tool.Tests/Mapster.Tool.Tests.csproj

@@ -4,14 +4,11 @@
         <TargetFrameworks>net10.0;net9.0;net8.0</TargetFrameworks>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
+      <TargetFrameworks>$(MapsterToolTFMs)</TargetFrameworks>
 		<IsTestProject>true</IsTestProject>
         <IsPackable>false</IsPackable>
     </PropertyGroup>
 
-    <PropertyGroup Condition=" '$(OS)' == 'Windows_NT' ">
-        <TargetFrameworks>$(TargetFrameworks);net48</TargetFrameworks>
-    </PropertyGroup>
-
     <ItemGroup>
         <PackageReference Include="FluentAssertions" Version="7.0.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />

src/Mapster.Tool.Tests/Usings.cs

@@ -1 +1,3 @@
-global using Xunit;
+global using Xunit;
+global using Mapster.Tool;
+global using Mapster.Tool.Tests.Helpers;

src/Mapster.Tool.Tests/WhenMappingWithExistingObjectAndInitProperties.cs

@@ -22,6 +22,57 @@ public void MapWithReflection()
         userMapper.MapTo(user, dto);
         dto.Name.Should().Be(expected);
     }
+
+    /// <summary>
+    /// https://github.com/MapsterMapper/Mapster/issues/1017
+    /// </summary>
+    [Fact]
+    public void CreateDtoWithcustomResolver()
+    {
+        var mappers = new List<string>();
+
+        Generators.GenerateExtensions(ConfigHelpers.optExtentions, mappers);
+
+        var result = mappers.Where(x => x.Contains("User1017Dto AdaptToDto(this User1017")).FirstOrDefault();
+
+        result.Should().NotBeNullOrEmpty();
+        result.Contains("FullName = string.Format(\"{0} {1}\", p1.FirstName, p1.LastName)").Should().BeTrue();
+    }
+}
+
+
+public class User1017
+{
+    public int Id { get; set; }
+    public string Email { get; set; }
+    public string FirstName { get; set; }
+    public string LastName { get; set; }
+    public int Age { get; set; }
+}
+
+public partial class User1017Dto
+{
+    public int Id { get; set; }
+    public string Email { get; set; }
+    public string FullName { get; set; }
+    public int Age { get; set; }
+}
+
+
+public class UserCodeGenConfig : ICodeGenerationRegister
+{
+    public void Register(CodeGenerationConfig config)
+    {
+        config.AdaptTo("[name]Dto", MapType.Map)
+            .ForType<User1017>(p =>
+            {
+                p.Ignore(s => s.FirstName);
+                p.Map(s => s.LastName, s => $"{s.FirstName} {s.LastName}", "FullName");
+            });
+
+        config.GenerateMapper("[name]Mapper")
+            .ForType<User1017>();
+    }
 }
 
 public class UserMappingRegister : IRegister