diff --git a/tools/chatgui/tests/test_runtime_deploy.sh b/tools/chatgui/tests/test_runtime_deploy.sh
new file mode 100644
index 00000000..4f64b1e2
--- /dev/null
+++ b/tools/chatgui/tests/test_runtime_deploy.sh
@@ -0,0 +1,85 @@
+#!/bin/bash
+# Настоящий build.sh с подставленными CMake/PE-импортами: Qt6, Qt5 и полный runtime-комплект.
+set -euo pipefail
+source_dir=$(cd "$(dirname "$0")/.." && pwd)
+fixture_root=$(mktemp -d)
+trap 'rm -rf -- "$fixture_root"' EXIT
+mkdir -p "$fixture_root/commands"
+cat > "$fixture_root/commands/cmake" <<'SH'
+#!/bin/bash
+set -eu
+if [ "$1" = --build ]; then
+    printf 'DLL Name: Qt%sWidgets.dll\nDLL Name: Qt%sNetwork.dll\n' "$DEPLOY_MAJOR" "$DEPLOY_MAJOR" > "$2/vibechat.exe"
+else
+    while [ "$1" != -B ]; do shift; done
+    mkdir -p "$2"
+    printf 'Qt%s\n' "$DEPLOY_MAJOR" > "$2/chatgui_qt_package.txt"
+fi
+SH
+cat > "$fixture_root/commands/objdump" <<'SH'
+#!/bin/bash
+cat "$2"
+SH
+chmod +x "$fixture_root/commands/"*
+
+prepare_case() {
+    case_dir="$fixture_root/Qt$1 package"; prefix="$case_dir/ucrt64"
+    mkdir -p "$case_dir/rlottie_build" "$prefix/bin" "$prefix/share/qt$1/plugins/platforms" "$prefix/share/qt$1/plugins/imageformats"
+    cp "$source_dir/build.sh" "$source_dir/compiler_runtime.sh" "$case_dir/"
+    printf 'DLL Name: KERNEL32.dll\n' > "$case_dir/rlottie_build/librlottie.dll"
+    printf 'fixture\n' > "$case_dir/setup_firewall.bat"
+    printf 'DLL Name: AUTHZ.dll\n' > "$prefix/bin/Qt$1Core.dll"
+    printf 'DLL Name: d3d12.dll\nDLL Name: libpng.dll\n' > "$prefix/bin/Qt$1Gui.dll"
+    printf 'DLL Name: WINHTTP.dll\n' > "$prefix/bin/Qt$1Network.dll"
+    printf 'DLL Name: Qt%sGui.dll\nDLL Name: Qt%sCore.dll\nDLL Name: libstdc++-6.dll\n' "$1" "$1" > "$prefix/bin/Qt$1Widgets.dll"
+    for name in libpng.dll libstdc++-6.dll libgcc_s_seh-1.dll libwinpthread-1.dll zlib1.dll libcrypto-3.dll plugin-helper.dll jpeg-helper.dll; do
+        printf 'DLL Name: KERNEL32.dll\n' > "$prefix/bin/$name"
+    done
+    printf 'DLL Name: Qt%sGui.dll\nDLL Name: plugin-helper.dll\n' "$1" > "$prefix/share/qt$1/plugins/platforms/qwindows.dll"
+    printf 'DLL Name: jpeg-helper.dll\n' > "$prefix/share/qt$1/plugins/imageformats/qjpeg.dll"
+    cat > "$prefix/bin/windeployqt$1.exe" <<SH
+#!/bin/bash
+if [ "\$1" = --version ]; then echo 'windeployqt $1.10.0'; else echo 'Qt$1 deploy' >> "\$DEPLOY_TOOL_LOG"; fi
+SH
+    chmod +x "$prefix/bin/windeployqt$1.exe"
+}
+run_case() {
+    (cd "$case_dir"; PATH="$fixture_root/commands:$PATH" DEPLOY_MAJOR="$1" DEPLOY_TOOL_LOG="$case_dir/tool.log" \
+        MSYSTEM= MSYSTEM_PREFIX="$prefix" bash build.sh) > "$case_dir/output.log" 2>&1
+}
+assert_file() { [ -f "$1" ] || { echo "FAIL: missing deployed file $1"; exit 1; }; }
+
+prepare_case 6
+# Старый комплект Qt5 и одноимённый plugin не должны удовлетворить проверку Qt6.
+mkdir -p "$case_dir/build/platforms" "$prefix/share/qt5/plugins/platforms"
+printf 'wrong Qt5 plugin\n' > "$prefix/share/qt5/plugins/platforms/qwindows.dll"
+for component in Core Gui Network Widgets; do printf 'old Qt5\n' > "$case_dir/build/Qt5$component.dll"; done
+run_case 6
+for name in Qt6Gui.dll plugin-helper.dll jpeg-helper.dll imageformats/qjpeg.dll; do assert_file "$case_dir/build/$name"; done
+cmp "$case_dir/build/platforms/qwindows.dll" "$prefix/share/qt6/plugins/platforms/qwindows.dll"
+[ "$(cat "$case_dir/tool.log")" = 'Qt6 deploy' ]
+# Наличие основных DLL не отменяет проверку транзитивных зависимостей.
+rm "$case_dir/build/libpng.dll" "$case_dir/build/plugin-helper.dll"
+run_case 6; assert_file "$case_dir/build/libpng.dll"; assert_file "$case_dir/build/plugin-helper.dll"
+echo 'PASS: Qt6, Windows system DLLs, matching platform/JPEG plugins and repeated dependency checks'
+
+# Нет подходящего deploy tool: копирование DLL/плагинов всё равно должно работать.
+rm "$prefix/bin/windeployqt6.exe"
+cat > "$prefix/bin/windeployqt.exe" <<'SH'
+#!/bin/bash
+if [ "$1" = --version ]; then echo 'windeployqt 5.15.0'; else exit 90; fi
+SH
+chmod +x "$prefix/bin/windeployqt.exe"
+run_case 6
+echo 'PASS: incorrect Qt5 deploy tool ignored for Qt6, direct deployment succeeds'
+
+# Ошибка действительно отсутствующей сторонней DLL остаётся ошибкой сборки.
+rm "$case_dir/build/jpeg-helper.dll" "$prefix/bin/jpeg-helper.dll"
+if run_case 6; then echo 'FAIL: missing plugin dependency accepted'; exit 1; fi
+rg -q 'requires jpeg-helper.dll' "$case_dir/output.log"
+echo 'PASS: missing plugin dependency rejects incomplete deployment'
+
+prepare_case 5; run_case 5
+assert_file "$case_dir/build/Qt5Gui.dll"; [ "$(cat "$case_dir/tool.log")" = 'Qt5 deploy' ]
+cmp "$case_dir/build/platforms/qwindows.dll" "$prefix/share/qt5/plugins/platforms/qwindows.dll"
+echo 'PASS: configured Qt5 fallback deploys matching DLLs and plugins'