[Bug]: Documentation: runsettings is not actually supported

[dosolkowski-work]

Description

The documentation for code coverage (under extensions, as well as for individual frameworks e.g. migrating from NUnit) says that code coverage behavior can be customized using a .runsettings file. However, .runsettings files do not appear to be supported by TUnit using Microsoft.Testing.Platform; instead, MTP uses testconfig.json files with basically the same options, although some defaults are different. The documentation should show testconfig.json examples instead.

Expected Behavior

Using a .runsettings file would customize the behavior of the code coverage tool.

Actual Behavior

The code coverage report is always completely blank, with the message "Empty results generated: No binaries were instrumented. Make sure the tests ran, required binaries were loaded, had matching symbol files, and were not excluded through custom settings. For native C++ code coverage you have to link with /PROFILE option enabled. For more information see https://docs.microsoft.com/visualstudio/test/troubleshooting-code-coverage"

Steps to Reproduce

Example .runsettings file:

<?xml version="1.0" encoding="utf-8"?>
<RunSettings>
    <DataCollectionRunSettings>
        <DataCollectors>
            <DataCollector friendlyName="Code Coverage" uri="datacollector://Microsoft/CodeCoverage/2.0" assemblyQualifiedName="Microsoft.VisualStudio.Coverage.DynamicCoverageDataCollector, Microsoft.VisualStudio.TraceCollector, Version=11.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
                <Configuration>
                    <CodeCoverage>
                        <Attributes>
                            <Exclude>
                                <Attribute>^System\.Diagnostics\.DebuggerHiddenAttribute$</Attribute>
                                <Attribute>^System\.Diagnostics\.DebuggerNonUserCodeAttribute$</Attribute>
                                <Attribute>^System\.CodeDom\.Compiler\.GeneratedCodeAttribute$</Attribute>
                                <Attribute>^System\.Diagnostics\.CodeAnalysis\.ExcludeFromCodeCoverageAttribute$</Attribute>
                            </Exclude>
                        </Attributes>
                    </CodeCoverage>
                </Configuration>
            </DataCollector>
        </DataCollectors>
    </DataCollectionRunSettings>
</RunSettings>

TUnit Version

1.12.139

.NET Version

.NET 10

Operating System

Windows

IDE / Test Runner

Visual Studio

Error Output / Stack Trace

Additional Context

There isn't actually an option to pass a .runsettings file to dotnet test, it only accepts testconfig.json files. The only way to even try to supply a .runsettings file is in Visual Studio, because it doesn't support testconfig.json yet, but this doesn't work for me. Even if there is a way to get it working, it would only be an option in Visual Studio, and everyone not using Visual Studio would still have to use testconfig.json.

IDE-Specific Issue?

• I've confirmed this issue occurs when running via dotnet test or dotnet run, not just in my IDE