Use coverlet collector

.github/workflows/CI.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Build & test
         # Tests need access to secrets, so we can't run them against PRs because of limited trust
         if: ${{ github.event_name != 'pull_request' }}
-        run: dotnet test --configuration Release --logger GitHubActions
+        run: dotnet test --configuration Release --logger GitHubActions --collect:"XPlat Code Coverage" -- DataCollectionRunSettings.DataCollectors.DataCollector.Configuration.Format=opencover
         env:
           DISCORD_TOKEN: ${{ secrets.DISCORD_TOKEN }}
           DISCORD_TOKEN_BOT: true
@@ -45,4 +45,4 @@ jobs:
         uses: actions/upload-artifact@v1
         with:
           name: DiscordChatExporter
-          path: DiscordChatExporter.Gui/bin/Publish/
+          path: DiscordChatExporter.Gui/bin/Publish/

DiscordChatExporter.Cli.Tests/DiscordChatExporter.Cli.Tests.csproj

@@ -1,28 +1,26 @@
 <Project Sdk="Microsoft.NET.Sdk">
-  
+
   <PropertyGroup>
     <IsPackable>false</IsPackable>
     <IsTestProject>true</IsTestProject>
-    <CollectCoverage>true</CollectCoverage>
-    <CoverletOutputFormat>opencover</CoverletOutputFormat>
     <NoWarn>$(NoWarn);xUnit1013</NoWarn>
   </PropertyGroup>
-  
+
   <ItemGroup>
     <Content Include="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
     <None Include="*.secret" CopyToOutputDirectory="PreserveNewest" />
   </ItemGroup>
-  
+
   <ItemGroup>
     <PackageReference Include="AngleSharp" Version="0.16.1" />
     <PackageReference Include="FluentAssertions" Version="6.5.1" />
     <PackageReference Include="GitHubActionsTestLogger" Version="1.3.0" PrivateAssets="all" />
     <PackageReference Include="JsonExtensions" Version="1.2.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
-    <PackageReference Include="coverlet.msbuild" Version="3.1.2" PrivateAssets="all" />
     <PackageReference Include="System.Reactive" Version="5.0.0" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" PrivateAssets="all" />
+    <PackageReference Include="coverlet.collector" Version="3.1.2" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>