From 520242b90cbe270792aabe1e94044cbd919c2b62 Mon Sep 17 00:00:00 2001
From: Oliver Hamlet <git@ortham.net>
Date: Fri, 29 May 2026 19:45:32 +0100
Subject: [PATCH] Add config for measuring code coverage using MSVC 2026

It may work for older versions of MSVC, but before 2026 it wasn't available in the Community edition.
---
 cpp/.runsettings   | 47 ++++++++++++++++++++++++++++++++++++++++++++++
 cpp/CMakeLists.txt |  6 ++++++
 2 files changed, 53 insertions(+)
 create mode 100644 cpp/.runsettings

diff --git a/cpp/.runsettings b/cpp/.runsettings
new file mode 100644
index 00000000..5f3b0228
--- /dev/null
+++ b/cpp/.runsettings
@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- File name extension must be .runsettings -->
+<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>
+          <Format>coverage</Format>
+          <Format>Cobertura</Format>
+          <CodeCoverage>
+            <ModulePaths>
+              <Include>
+                <ModulePath>.*\.dll$</ModulePath>
+              </Include>
+              <Exclude>
+                <ModulePath>.*googletestadapter\.(common|core|testadapter)\.dll</ModulePath>
+              </Exclude>
+            </ModulePaths>
+
+            <Functions>
+              <Exclude>
+                <Function>^rust::cxxbridge1::.*</Function>
+              </Exclude>
+            </Functions>
+
+            <!-- We recommend you do not change the following values: -->
+
+            <!-- Set this to True to collect coverage information for functions marked with the "SecuritySafeCritical" attribute. Instead of writing directly into a memory location from such functions, code coverage inserts a probe that redirects to another function, which in turns writes into memory. -->
+            <UseVerifiableInstrumentation>True</UseVerifiableInstrumentation>
+            <!-- When set to True, collects coverage information from child processes that are launched with low-level ACLs, for example, UWP apps. -->
+            <AllowLowIntegrityProcesses>True</AllowLowIntegrityProcesses>
+            <!-- When set to True, collects coverage information from child processes that are launched by test or production code. -->
+            <CollectFromChildProcesses>True</CollectFromChildProcesses>
+            <!-- When set to True, restarts the IIS process and collects coverage information from it. -->
+            <CollectAspDotNet>False</CollectAspDotNet>
+            <!-- When set to True, static native instrumentation will be enabled. -->
+            <EnableStaticNativeInstrumentation>True</EnableStaticNativeInstrumentation>
+            <!-- When set to True, dynamic native instrumentation will be enabled. -->
+            <EnableDynamicNativeInstrumentation>True</EnableDynamicNativeInstrumentation>
+            <!-- When set to True, instrumented binaries on disk are removed and original files are restored. -->
+            <EnableStaticNativeInstrumentationRestore>True</EnableStaticNativeInstrumentationRestore>
+          </CodeCoverage>
+        </Configuration>
+      </DataCollector>
+    </DataCollectors>
+  </DataCollectionRunSettings>
+</RunSettings>
diff --git a/cpp/CMakeLists.txt b/cpp/CMakeLists.txt
index 6856149b..acda478a 100644
--- a/cpp/CMakeLists.txt
+++ b/cpp/CMakeLists.txt
@@ -253,6 +253,12 @@ if(MSVC)
         "/sdl"
         "$<$<CONFIG:Debug>:/RTC1>")
     target_link_options(libloot PRIVATE "/INCREMENTAL:NO" "/LTCG")
+
+    # Copy test code coverage config into build directory where MSVC expects to
+    # find it.
+    configure_file("${PROJECT_SOURCE_DIR}/.runsettings"
+        "${PROJECT_BINARY_DIR}/.runsettings"
+        COPYONLY)
 endif()
 
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