Enable building WASDK Self-Contained packaged apps

Author: mattleibow

src/TestUtils/src/Microsoft.Maui.IntegrationTests/TemplateTests.cs

@@ -113,6 +113,33 @@ public void BuildUnpackaged(string id, string framework, string config)
 				$"Project {Path.GetFileName(projectFile)} failed to build. Check test output/attachments for errors.");
 		}
 
+		[Test]
+		[TestCase("maui", true, true)]
+		[TestCase("maui", true, false)]
+		[TestCase("maui", false, true)]
+		public void BuildSelfContained(string id, bool wasdkself, bool netself)
+		{
+			var projectDir = TestDirectory;
+			var projectFile = Path.Combine(projectDir, $"{Path.GetFileName(projectDir)}.csproj");
+
+			Assert.IsTrue(DotnetInternal.New(id, projectDir, DotNetCurrent),
+				$"Unable to create template {id}. Check test output for errors.");
+
+			FileUtilities.ReplaceInFile(projectFile,
+				"<UseMaui>true</UseMaui>",
+				$"""
+				<UseMaui>true</UseMaui>
+				<WindowsAppSDKSelfContained>{wasdkself}</WindowsAppSDKSelfContained>
+				<SelfContained>{netself}</SelfContained>
+				""");
+
+			var extendedBuildProps = BuildProps;
+			extendedBuildProps.Add($"TargetFramework={DotNetCurrent}-windows10.0.19041.0");
+
+			Assert.IsTrue(DotnetInternal.Build(projectFile, "Release", properties: extendedBuildProps, msbuildWarningsAsErrors: true),
+				$"Project {Path.GetFileName(projectFile)} failed to build. Check test output/attachments for errors.");
+		}
+
 		[Test]
 		[TestCase("maui", $"{DotNetCurrent}-ios", "ios-arm64")]
 		public void PublishNativeAOT(string id, string framework, string runtimeIdentifier)