add test to show forced base image

Author: baronfel

test/Microsoft.NET.Build.Containers.IntegrationTests/CreateNewImageTests.cs

@@ -296,6 +296,72 @@ public async System.Threading.Tasks.Task CreateNewImage_RootlessBaseImage()
         Assert.Equal(RootlessUser, imageBuilder.BaseImageConfig.GetUser());
     }
 
+
+    [DockerAvailableFact]
+    public void CanOverrideContainerImageFormat()
+    {
+        DirectoryInfo newProjectDir = new(GetTestDirectoryName());
+
+        if (newProjectDir.Exists)
+        {
+            newProjectDir.Delete(recursive: true);
+        }
+
+        newProjectDir.Create();
+
+        new DotnetNewCommand(_testOutput, "console", "-f", ToolsetInfo.CurrentTargetFramework)
+            .WithVirtualHive()
+            .WithWorkingDirectory(newProjectDir.FullName)
+            .Execute()
+            .Should().Pass();
+
+        new DotnetCommand(_testOutput, "build", "--configuration", "release")
+            .WithWorkingDirectory(newProjectDir.FullName)
+            .Execute()
+            .Should().Pass();
+
+        ParseContainerProperties pcp = new();
+        (IBuildEngine buildEngine, List<string?> errors) = SetupBuildEngine();
+        pcp.BuildEngine = buildEngine;
+
+        pcp.FullyQualifiedBaseImageName = "mcr.microsoft.com/dotnet/runtime:9.0";
+        pcp.ContainerRegistry = "localhost:5010";
+        pcp.ContainerRepository = "dotnet/testimage";
+        pcp.ContainerImageTags = new[] { "5.0", "latest" };
+
+        Assert.True(pcp.Execute(), FormatBuildMessages(errors));
+        Assert.Equal("mcr.microsoft.com", pcp.ParsedContainerRegistry);
+        Assert.Equal("dotnet/runtime", pcp.ParsedContainerImage);
+        Assert.Equal("9.0", pcp.ParsedContainerTag);
+
+        Assert.Equal("dotnet/testimage", pcp.NewContainerRepository);
+        pcp.NewContainerTags.Should().BeEquivalentTo(new[] { "5.0", "latest" });
+
+        CreateNewImage cni = new();
+        (buildEngine, errors) = SetupBuildEngine();
+        cni.BuildEngine = buildEngine;
+
+        cni.BaseRegistry = pcp.ParsedContainerRegistry;
+        cni.BaseImageName = pcp.ParsedContainerImage;
+        cni.BaseImageTag = pcp.ParsedContainerTag;
+        cni.Repository = pcp.NewContainerRepository;
+        cni.OutputRegistry = "localhost:5010";
+        cni.PublishDirectory = Path.Combine(newProjectDir.FullName, "bin", "release", ToolsetInfo.CurrentTargetFramework);
+        cni.WorkingDirectory = "app/";
+        cni.Entrypoint = new TaskItem[] { new(newProjectDir.Name) };
+        cni.ImageTags = pcp.NewContainerTags;
+        cni.ContainerRuntimeIdentifier = "linux-x64";
+        cni.RuntimeIdentifierGraphPath = ToolsetUtils.GetRuntimeGraphFilePath();
+
+        cni.ImageFormat = KnownImageFormats.OCI.ToString();
+
+        Assert.True(cni.Execute(), FormatBuildMessages(errors));
+
+        cni.GeneratedContainerMediaType.Should().Be(SchemaTypes.OciManifestV1);
+        newProjectDir.Delete(true);
+    }
+
+
     private static (IBuildEngine buildEngine, List<string?> errors) SetupBuildEngine()
     {
         List<string?> errors = new();