我在同一个解决方案中有一个.NET MAUI项目和一个（单元）测试项目。测试项目引用了.NET MAUI项目，测试运行良好。我还想为.NET MAUI项目添加代码覆盖率。但是，我无法让它与coverlet.collector一起工作，因为生成的coverage.cobertura.xml不包括.NET MAUI项目（作为其中一个包）。
为什么它不选择.NET MAUI项目？
以下是我的Tests项目的 proj 文件：

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <TargetFramework>net6.0</TargetFramework>
        <IsPackable>false</IsPackable>
        <EnableNETAnalyzers>true</EnableNETAnalyzers>
        <Nullable>enable</Nullable>
    </PropertyGroup>
    <ItemGroup>
        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
        <PackageReference Include="xunit" Version="2.4.2" />
        <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
            <PrivateAssets>all</PrivateAssets>
        </PackageReference>
        <PackageReference Include="coverlet.collector" Version="3.2.0">
            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
            <PrivateAssets>all</PrivateAssets>
        </PackageReference>
        <PackageReference Include="FluentAssertions" Version="6.8.0" />
        <PackageReference Include="NSubstitute" Version="4.4.0" />
    </ItemGroup>
    <ItemGroup>
      <ProjectReference Include="..\..\Source\MauiApp.Client\MauiApp.Client.csproj" />
      <ProjectReference Include="..\..\Source\Service\Service.csproj" />
    </ItemGroup>
    <ItemGroup>
      <Folder Include="Service\" />
    </ItemGroup>
</Project>

下面是我的**.NET MAUI**项目的 proj 文件：

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <!--<TargetFrameworks>net6.0-ios;net6.0</TargetFrameworks>-->
        <TargetFrameworks>net6.0</TargetFrameworks>
        <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">net6.0-windows10.0.19041.0;$(TargetFrameworks)</TargetFrameworks>
        <!-- Uncomment to also build the tizen app. You will need to install tizen by following this: https://github.com/Samsung/Tizen.NET -->
        <!-- <TargetFrameworks>$(TargetFrameworks);net6.0-tizen</TargetFrameworks> -->
        <OutputType Condition="'$(TargetFramework)' != 'net6.0'">Exe</OutputType>
        <RootNamespace>$(MSBuildProjectName.Replace("-", "_"))</RootNamespace>
        <UseMaui>true</UseMaui>
        <SingleProject>true</SingleProject>
        <ImplicitUsings>enable</ImplicitUsings>
        <Nullable>enable</Nullable>
        <!-- Display name -->
        <ApplicationTitle>GridSwift</ApplicationTitle>
        <!-- App Identifier -->
        <ApplicationId>someapp.gist</ApplicationId>
        <ApplicationIdGuid>CCB22D0C-6528-4C55-9BB7-2CAB312363AB</ApplicationIdGuid>
        <!-- Versions -->
        <ApplicationDisplayVersion>1.0</ApplicationDisplayVersion>
        <ApplicationVersion>1</ApplicationVersion>
        <!-- <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">15.4</SupportedOSPlatformVersion>-->
        <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.19041.0</SupportedOSPlatformVersion>
        <TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.19041.0</TargetPlatformMinVersion>
        <DefaultLanguage>en-us</DefaultLanguage>
    </PropertyGroup>
    <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net6.0-windows10.0.19041.0|AnyCPU'">
      <TreatWarningsAsErrors>True</TreatWarningsAsErrors>
    </PropertyGroup>
    <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net6.0-windows10.0.19041.0|AnyCPU'">
      <TreatWarningsAsErrors>True</TreatWarningsAsErrors>
    </PropertyGroup>
    <ItemGroup>
        <!-- App Icon -->
        <MauiIcon Include="Resources\AppIcon\appicon.svg" ForegroundFile="Resources\AppIcon\appiconfg.svg" Color="#512BD4" />
        <!-- Splash Screen -->
        <MauiSplashScreen Include="Resources\Splash\splash.svg" Color="#512BD4" BaseSize="128,128" />
        <!-- Images -->
        <MauiImage Include="Resources\Images\*" />
        <MauiImage Update="Resources\Images\dotnet_bot.svg" BaseSize="168,208" />
        <!-- Custom Fonts -->
        <MauiFont Include="Resources\Fonts\*" />
        <!-- Raw Assets (also remove the "Resources\Raw" prefix) -->
        <MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
    </ItemGroup>
    <ItemGroup>
        <PackageReference Include="Microsoft.Identity.Client" Version="4.48.0" />
        <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
        <PackageReference Include="ReduxSimple" Version="3.7.0" />
    </ItemGroup>
    <ItemGroup>
      <MauiXaml Update="Views\LoginView.xaml">
        <Generator>MSBuild:Compile</Generator>
      </MauiXaml>
    </ItemGroup>
</Project>

我在Tests项目根目录下运行以下命令：第一个月
...并最终获得以下输出：

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
Passed!  - Failed:     0, Passed:    22, Skipped:     0, Total:    22, Duration: 199 ms - Tests.dll (net6.0)
Attachments:
  C:\Users\T702180\code\MyApp\Testing\Tests\TestResults\4a6ce0bf-8748-4f58-9fe9-b3ae8a0958a0\coverage.cobertura.xml

所有测试均通过，包括涵盖MauiApp.Client的测试。
以下是 coverage.cobertura.xml 文件的内容：

<?xml version="1.0" encoding="utf-8"?>
<coverage line-rate="0.37929999999999997" branch-rate="0.3285" version="1.9" timestamp="1670364272" lines-covered="239" lines-valid="630" branches-covered="23" branches-valid="70">
  <sources>
    <source>C:\Users\T702180\code\MyApp\Source\Service\</source>
  </sources>
  <packages>
    <package name="Service" line-rate="0.37929999999999997" branch-rate="0.3285" complexity="211">
      ...
    </package>
  </packages>
</coverage>

正如您所看到的，coverage.cobertura.xml 文件缺少MauiApp.Client包，但是它选择了Service项目，这只是一个普通的.NET 6项目（非MAUI）。
我在我的Windows 10机器本地以及ADO管道中看到了相同的行为。