test: Add tests for PropertyGroup Condition attribute in Target elements

Confirms that Condition attributes are correctly emitted on PropertyGroup
elements inside Target elements. No code changes needed - functionality
already working correctly.

Author: JerrettDavis

test/JD.MSBuild.Fluent.Tests/PropertyGroupInTargetTests.cs

@@ -0,0 +1,73 @@
+using JD.MSBuild.Fluent.Fluent;
+using JD.MSBuild.Fluent.Render;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace JD.MSBuild.Fluent.Tests;
+
+public class PropertyGroupInTargetTests
+{
+    private readonly ITestOutputHelper _output;
+
+    public PropertyGroupInTargetTests(ITestOutputHelper output)
+    {
+        _output = output;
+    }
+
+    [Fact]
+    public void PropertyGroup_WithCondition_InsideTarget_EmitsConditionAttribute()
+    {
+        // Arrange
+        var project = Package.Define("TestPackage")
+            .Targets(t =>
+            {
+                t.Target("TestTarget", target =>
+                {
+                    target.PropertyGroup("'$(MyProp)' == ''", group =>
+                    {
+                        group.Property("MyProp", "DefaultValue");
+                    });
+                });
+            })
+            .Build();
+
+        // Act
+        var renderer = new MsBuildXmlRenderer();
+        var xml = renderer.RenderToString(project.Targets);
+        _output.WriteLine("Generated XML:");
+        _output.WriteLine(xml);
+
+        // Assert
+        Assert.Contains("<PropertyGroup Condition=\"'$(MyProp)' == ''\">", xml);
+        Assert.Contains("<MyProp>DefaultValue</MyProp>", xml);
+    }
+
+    [Fact]
+    public void PropertyGroup_WithoutCondition_InsideTarget_EmitsWithoutConditionAttribute()
+    {
+        // Arrange
+        var project = Package.Define("TestPackage")
+            .Targets(t =>
+            {
+                t.Target("TestTarget", target =>
+                {
+                    target.PropertyGroup(null, group =>
+                    {
+                        group.Property("MyProp", "Value");
+                    });
+                });
+            })
+            .Build();
+
+        // Act
+        var renderer = new MsBuildXmlRenderer();
+        var xml = renderer.RenderToString(project.Targets);
+        _output.WriteLine("Generated XML:");
+        _output.WriteLine(xml);
+
+        // Assert
+        Assert.Contains("<PropertyGroup>", xml);
+        Assert.DoesNotContain("<PropertyGroup Condition=", xml);
+        Assert.Contains("<MyProp>Value</MyProp>", xml);
+    }
+}