diff --git a/CMakeLists.txt b/CMakeLists.txt
index 39e3243..cc1ea7f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -186,6 +186,9 @@ add_custom_command(TARGET lvt_wpf_tap POST_BUILD
     COMMAND ${CMAKE_COMMAND} -E copy_if_different
         "${CMAKE_SOURCE_DIR}/src/tap_wpf/bin/Release/LvtWpfTap.dll"
         "$<TARGET_FILE_DIR:lvt>/LvtWpfTap.dll"
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different
+        "${CMAKE_SOURCE_DIR}/src/tap_wpf/LvtWpfTap.runtimeconfig.json"
+        "$<TARGET_FILE_DIR:lvt>/LvtWpfTap.runtimeconfig.json"
     COMMENT "Copying managed WPF tree walker assembly"
 )
 
@@ -288,19 +291,35 @@ target_link_libraries(lvt_unit_tests PRIVATE
 )
 add_test(NAME unit_tests COMMAND lvt_unit_tests)
 
+# WPF sample app used by integration tests
+set(WPF_SAMPLE_PROJECT "${CMAKE_SOURCE_DIR}/tests/apps/WpfSample/WpfSample.csproj")
+set(WPF_SAMPLE_OUTPUT_DIR "${CMAKE_BINARY_DIR}/tests/apps/WpfSample")
+add_custom_target(wpf_sample_app ALL
+    COMMAND dotnet build "${WPF_SAMPLE_PROJECT}" -c Release -o "${WPF_SAMPLE_OUTPUT_DIR}"
+    BYPRODUCTS "${WPF_SAMPLE_OUTPUT_DIR}/WpfSample.exe"
+    WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
+    COMMENT "Building WPF sample app"
+)
+file(TO_NATIVE_PATH "${WPF_SAMPLE_OUTPUT_DIR}/WpfSample.exe" WPF_SAMPLE_EXE_NATIVE)
+string(REPLACE "\\" "\\\\" WPF_SAMPLE_EXE_ESCAPED "${WPF_SAMPLE_EXE_NATIVE}")
+
 # Integration tests — require a running Notepad instance
 add_executable(lvt_integration_tests
     tests/integration_tests.cpp
     tests/lvt_integration_tests.rc
 )
 target_include_directories(lvt_integration_tests PRIVATE src)
-target_compile_definitions(lvt_integration_tests PRIVATE WIN32_LEAN_AND_MEAN NOMINMAX WINRT_LEAN_AND_MEAN UNICODE _UNICODE)
+target_compile_definitions(lvt_integration_tests PRIVATE
+    WIN32_LEAN_AND_MEAN NOMINMAX WINRT_LEAN_AND_MEAN UNICODE _UNICODE
+    WPF_SAMPLE_EXE_PATH="${WPF_SAMPLE_EXE_ESCAPED}"
+)
 target_link_libraries(lvt_integration_tests PRIVATE
     GTest::gtest GTest::gtest_main
     WIL::WIL nlohmann_json::nlohmann_json
     comctl32
 )
 target_link_options(lvt_integration_tests PRIVATE "/MANIFEST:NO")
+add_dependencies(lvt_integration_tests wpf_sample_app)
 add_test(NAME integration_tests COMMAND lvt_integration_tests)
 
 # Chromium plugin tests — DOM JSON format and native messaging protocol
diff --git a/src/tap_wpf/LvtWpfTap.runtimeconfig.json b/src/tap_wpf/LvtWpfTap.runtimeconfig.json
new file mode 100644
index 0000000..b723c2a
--- /dev/null
+++ b/src/tap_wpf/LvtWpfTap.runtimeconfig.json
@@ -0,0 +1,9 @@
+{
+  "runtimeOptions": {
+    "framework": {
+      "name": "Microsoft.WindowsDesktop.App",
+      "version": "8.0.0",
+      "rollForward": "LatestMajor"
+    }
+  }
+}
diff --git a/src/tap_wpf/wpf_tap_native.cpp b/src/tap_wpf/wpf_tap_native.cpp
index 7d5b2a4..3f5d3b2 100644
--- a/src/tap_wpf/wpf_tap_native.cpp
+++ b/src/tap_wpf/wpf_tap_native.cpp
@@ -247,7 +247,8 @@ static bool TryNetCore(const std::wstring& assemblyPath, const std::wstring& pip
             fprintf(f, "{\n  \"runtimeOptions\": {\n"
                        "    \"framework\": {\n"
                        "      \"name\": \"Microsoft.WindowsDesktop.App\",\n"
-                       "      \"version\": \"8.0.0\"\n"
+                       "      \"version\": \"8.0.0\",\n"
+                       "      \"rollForward\": \"LatestMajor\"\n"
                        "    }\n  }\n}\n");
             fclose(f);
             LogMsg("Created runtimeconfig.json");
diff --git a/tests/apps/WpfSample/App.xaml b/tests/apps/WpfSample/App.xaml
new file mode 100644
index 0000000..ae68159
--- /dev/null
+++ b/tests/apps/WpfSample/App.xaml
@@ -0,0 +1,6 @@
+<Application x:Class="WpfSample.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             StartupUri="MainWindow.xaml">
+  <Application.Resources />
+</Application>
diff --git a/tests/apps/WpfSample/App.xaml.cs b/tests/apps/WpfSample/App.xaml.cs
new file mode 100644
index 0000000..9b587c7
--- /dev/null
+++ b/tests/apps/WpfSample/App.xaml.cs
@@ -0,0 +1,7 @@
+using System.Windows;
+
+namespace WpfSample;
+
+public partial class App : Application
+{
+}
diff --git a/tests/apps/WpfSample/MainWindow.xaml b/tests/apps/WpfSample/MainWindow.xaml
new file mode 100644
index 0000000..7ee56c5
--- /dev/null
+++ b/tests/apps/WpfSample/MainWindow.xaml
@@ -0,0 +1,28 @@
+<Window x:Class="WpfSample.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        Title="LVT WPF Sample" Width="420" Height="260"
+        WindowStartupLocation="CenterScreen">
+  <Grid Margin="16">
+    <Grid.RowDefinitions>
+      <RowDefinition Height="Auto" />
+      <RowDefinition Height="Auto" />
+      <RowDefinition Height="Auto" />
+      <RowDefinition Height="*" />
+    </Grid.RowDefinitions>
+    <Grid.ColumnDefinitions>
+      <ColumnDefinition Width="Auto" />
+      <ColumnDefinition Width="*" />
+    </Grid.ColumnDefinitions>
+
+    <TextBlock Text="Name:" VerticalAlignment="Center" Margin="0,0,8,8" />
+    <TextBox x:Name="NameBox" Grid.Column="1" Text="Ada" Margin="0,0,0,8" />
+    <CheckBox x:Name="AgreeCheck" Grid.Row="1" Grid.ColumnSpan="2"
+              Content="I agree" IsChecked="True" Margin="0,0,0,8" />
+    <StackPanel Grid.Row="2" Grid.ColumnSpan="2" Orientation="Horizontal" HorizontalAlignment="Right">
+      <TextBlock Text="Ready" VerticalAlignment="Center" Margin="0,0,12,0" />
+      <Button x:Name="CancelButton" Content="Cancel" Width="80" Margin="0,0,8,0" />
+      <Button x:Name="OkButton" Content="OK" Width="80" IsDefault="True" />
+    </StackPanel>
+  </Grid>
+</Window>
diff --git a/tests/apps/WpfSample/MainWindow.xaml.cs b/tests/apps/WpfSample/MainWindow.xaml.cs
new file mode 100644
index 0000000..19e8c16
--- /dev/null
+++ b/tests/apps/WpfSample/MainWindow.xaml.cs
@@ -0,0 +1,11 @@
+using System.Windows;
+
+namespace WpfSample;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+}
diff --git a/tests/apps/WpfSample/WpfSample.csproj b/tests/apps/WpfSample/WpfSample.csproj
new file mode 100644
index 0000000..a2103f1
--- /dev/null
+++ b/tests/apps/WpfSample/WpfSample.csproj
@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net10.0-windows</TargetFramework>
+    <UseWPF>true</UseWPF>
+    <AssemblyName>WpfSample</AssemblyName>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+</Project>
diff --git a/tests/integration_tests.cpp b/tests/integration_tests.cpp
index 8daff73..97298d7 100644
--- a/tests/integration_tests.cpp
+++ b/tests/integration_tests.cpp
@@ -9,6 +9,7 @@
 #include <array>
 #include <map>
 #include <set>
+#include <vector>
 #include <filesystem>
 #include <fstream>
 #include <nlohmann/json.hpp>
@@ -363,6 +364,44 @@ static void collect_key_contract_map(const json& el, const std::string& path,
     }
 }
 
+static bool json_tree_has_named_control(const json& el, const std::string& name) {
+    if (el.contains("properties") && el["properties"].is_object() &&
+        el["properties"].value("name", "") == name) {
+        return true;
+    }
+    if (el.contains("children") && el["children"].is_array()) {
+        for (auto& child : el["children"]) {
+            if (json_tree_has_named_control(child, name))
+                return true;
+        }
+    }
+    return false;
+}
+
+static const json* find_named_control(const json& el, const std::string& name) {
+    if (el.contains("properties") && el["properties"].is_object() &&
+        el["properties"].value("name", "") == name) {
+        return &el;
+    }
+    if (el.contains("children") && el["children"].is_array()) {
+        for (auto& child : el["children"]) {
+            if (auto* found = find_named_control(child, name))
+                return found;
+        }
+    }
+    return nullptr;
+}
+
+static bool frameworks_contain_wpf(const json& j) {
+    if (!j.contains("frameworks") || !j["frameworks"].is_array())
+        return false;
+    for (auto& fw : j["frameworks"]) {
+        if (fw.is_string() && fw.get<std::string>().starts_with("wpf"))
+            return true;
+    }
+    return false;
+}
+
 static const json* find_element_by_type_property(const json& el,
                                                  const std::string& type,
                                                  const std::string& property,
@@ -382,6 +421,124 @@ static const json* find_element_by_type_property(const json& el,
     return nullptr;
 }
 
+class WpfSampleFixture : public ::testing::Test {
+protected:
+    static void SetUpTestSuite() {
+        s_sample_exe = WPF_SAMPLE_EXE_PATH;
+        if (!fs::exists(s_sample_exe)) {
+            s_skip_reason = "WPF sample app not found: " + s_sample_exe;
+            return;
+        }
+
+        STARTUPINFOA si = {sizeof(si)};
+        s_pi = {};
+        auto workdir = fs::path(s_sample_exe).parent_path().string();
+        std::string cmd = "\"" + s_sample_exe + "\"";
+        if (!CreateProcessA(nullptr, cmd.data(), nullptr, nullptr, FALSE, 0,
+                            nullptr, workdir.c_str(), &si, &s_pi)) {
+            s_skip_reason = "Failed to launch WPF sample app";
+            return;
+        }
+        s_pid = s_pi.dwProcessId;
+        if (s_pi.hProcess) {
+            WaitForInputIdle(s_pi.hProcess, 5000);
+        }
+
+        auto lvt = get_lvt_path();
+        for (int attempt = 0; attempt < 30; ++attempt) {
+            auto output = run_command(make_cmd(lvt, get_pid_arg()));
+            auto j = json::parse(output, nullptr, false);
+            if (!j.is_discarded() && frameworks_contain_wpf(j) &&
+                j.contains("root") &&
+                json_tree_has_named_control(j["root"], "OkButton") &&
+                json_tree_has_named_control(j["root"], "NameBox") &&
+                json_tree_has_named_control(j["root"], "AgreeCheck")) {
+                s_ready = true;
+                return;
+            }
+            Sleep(1000);
+        }
+
+        s_skip_reason = "WPF sample app never became ready with WPF framework and named controls";
+    }
+
+    static void TearDownTestSuite() {
+        if (s_pi.hProcess) {
+            TerminateProcess(s_pi.hProcess, 0);
+            CloseHandle(s_pi.hProcess);
+            CloseHandle(s_pi.hThread);
+        }
+    }
+
+    static void SkipIfNotReady() {
+        if (!s_ready)
+            GTEST_SKIP() << s_skip_reason;
+    }
+
+    static std::string get_pid_arg() {
+        return "--pid " + std::to_string(s_pid);
+    }
+
+    static PROCESS_INFORMATION s_pi;
+    static DWORD s_pid;
+    static bool s_ready;
+    static std::string s_sample_exe;
+    static std::string s_skip_reason;
+};
+
+PROCESS_INFORMATION WpfSampleFixture::s_pi = {};
+DWORD WpfSampleFixture::s_pid = 0;
+bool WpfSampleFixture::s_ready = false;
+std::string WpfSampleFixture::s_sample_exe;
+std::string WpfSampleFixture::s_skip_reason;
+
+TEST_F(WpfSampleFixture, DurableKeyContract) {
+    SkipIfNotReady();
+
+    auto lvt = get_lvt_path();
+    auto first = run_command(make_cmd(lvt, get_pid_arg()));
+    auto second = run_command(make_cmd(lvt, get_pid_arg()));
+    ASSERT_FALSE(first.empty());
+    ASSERT_FALSE(second.empty());
+
+    auto j1 = json::parse(first, nullptr, false);
+    auto j2 = json::parse(second, nullptr, false);
+    ASSERT_FALSE(j1.is_discarded());
+    ASSERT_FALSE(j2.is_discarded());
+    ASSERT_TRUE(frameworks_contain_wpf(j1));
+
+    std::vector<const json*> elements;
+    collect_json_elements(j1["root"], elements);
+    ASSERT_GT(elements.size(), 0u);
+
+    std::set<std::string> keys;
+    for (auto* el : elements) {
+        auto key = el->value("key", "");
+        EXPECT_FALSE(key.empty()) << "Element " << el->value("id", "?") << " has empty durable key";
+        EXPECT_TRUE(keys.insert(key).second) << "Duplicate durable key: " << key;
+    }
+
+    std::map<std::string, std::string> firstMap;
+    std::map<std::string, std::string> secondMap;
+    collect_key_contract_map(j1["root"], "0", firstMap);
+    collect_key_contract_map(j2["root"], "0", secondMap);
+    EXPECT_EQ(firstMap, secondMap);
+
+    auto* okButton = find_named_control(j1["root"], "OkButton");
+    ASSERT_NE(okButton, nullptr);
+    EXPECT_EQ(okButton->value("framework", ""), "wpf");
+    EXPECT_EQ(okButton->value("type", ""), "Button");
+
+    auto okKey = okButton->value("key", "");
+    ASSERT_FALSE(okKey.empty());
+    auto queryOutput = run_command(make_cmd(lvt, get_pid_arg() + " --query " + cmd_escape_arg(okKey)));
+    auto queried = json::parse(queryOutput, nullptr, false);
+    ASSERT_FALSE(queried.is_discarded()) << queryOutput;
+    EXPECT_EQ(queried.value("key", ""), okKey);
+    EXPECT_EQ(queried.value("type", ""), "Button");
+    EXPECT_EQ(queried.value("framework", ""), "wpf");
+    EXPECT_EQ(queried.value("name", ""), "OkButton");
+}
 TEST_F(NotepadFixture, Win32BoundsReasonable) {
     // Every element in the Win32 tree should have reasonable (non-extreme) bounds
     auto lvt = get_lvt_path();