Tests skipped by filter are not shown as skipped/not executed in TRX report

[flibustier7seas]

Describe the bug

When running tests with the --filter option to exclude some categories (e.g., TestCategory!=Integration), the filtered-out tests are not shown in the resulting .trx report as skipped or not executed.

Steps To Reproduce

1. Create a test project with two NUnit tests, one marked with [Category("Integration")] and the other not:

   [Test]
   public void Test1() { /* basic test */ }
   
   [Test, Category("Integration")]
   public void Test2() { /* integration test */ }

2. Run the tests using a category filter:

   dotnet test -- --filter "TestCategory!=Integration" --results-directory ./TestResults --report-trx --report-trx-filename test-result.trx

3. Open the generated .trx report and examine the <Results> and <ResultSummary> sections.

Expected behavior

Both tests (Test1 and Test2) should be mentioned in the .trx report.

• Test1 should appear as executed and passed.
• Test2 should appear as skipped or not executed.

Actual behavior

Only Test1 appears in the .trx report under <Results>, <ResultSummary >. Test2 is missing entirely and is not mentioned in any part of the report.

<Results>
  <UnitTestResult executionId="f76a1c95-3a55-49b9-86fa-59dd03168db3" testId="4893b961-402c-b725-b58c-bbc9524c4af4" testName="Test1" computerName="MyPC" duration="00:00:01.0152400" startTime="2025-04-16T09:32:52.0791590+00:00" endTime="2025-04-16T09:32:53.0943576+00:00" testType="13CDC9D9-DDB5-4fa4-A97D-D965CCFC6D4B" outcome="Passed" testListId="8C84FA94-04C1-424b-9868-57A2D4851A1D" relativeResultsDirectory="f76a1c95-3a55-49b9-86fa-59dd03168db3" />
</Results>
<ResultSummary outcome="Completed">
  <Counters total="1" executed="1" passed="1" failed="0" error="0" timeout="0" aborted="0" inconclusive="0" passedButRunAborted="0" notRunnable="0" notExecuted="0" disconnected="0" warning="0" completed="0" inProgress="0" pending="0" />
</ResultSummary>

Additional context

Packages:

<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0"/>
<PackageReference Include="Microsoft.Testing.Platform" Version="[1.6.3]"/>
<PackageReference Include="Microsoft.Testing.Extensions.TrxReport" Version="[1.6.3]"/>
<PackageReference Include="Microsoft.Testing.Extensions.CodeCoverage" Version="[17.13.1]"/>
<PackageReference Include="NUnit" Version="[3.14.0]"/>
<PackageReference Include="NUnit3TestAdapter" Version="[5.0.0]"/>

[Youssef1313]

Skipped tests are different from filtered out tests. A filtered out test isn't discovered, and we don't send any messages related to it. So I tend to think this is by-design.

[Youssef1313]

I'm going to close out as I think the current behavior makes sense.