Add Qt Test runner and Windows CI build

Provide a single qmake test executable with named Qt Test cases and a standard make check entry point. Cover object-history compaction, cancellation, merging, and property-key comparisons with checks that remain active in release builds, and document how to add tests.

Build and run the tests in Linux and macOS CI and add a Windows x64 job using MSVC 2022 and Qt 6. Enable pull request and manual runs alongside master pushes, preserve JUnit reports on failures, and update existing checkout and cache actions.

Validation: macOS Qt 6.10 release tests and actionlint passed. Confirmed a failing assertion produces a nonzero check result and a JUnit failure.

Closes #1050

.github/workflows/continuous.yml

@@ -1,6 +1,9 @@
 name: LeoCAD CI
 
 on:
+  pull_request:
+    branches: [ "master" ]
+  workflow_dispatch:
   push:
     branches: [ "master" ]
 
@@ -24,18 +27,36 @@ jobs:
       run: qmake PREFIX=/usr
     - name: Build
       run: make -j ${{ steps.cpu-cores.outputs.count }}
+    - name: Generate test Makefile
+      run: |
+        mkdir -p build/tests
+        cd build/tests
+        qmake ../../tests/tests.pro CONFIG+=release CONFIG-=debug
+    - name: Build tests
+      working-directory: build/tests
+      run: make -j ${{ steps.cpu-cores.outputs.count }}
+    - name: Run tests
+      working-directory: build/tests
+      run: make check TESTARGS="-o test-results.xml,junitxml -o -,txt"
+    - name: Upload test results
+      if: always()
+      uses: actions/upload-artifact@v4
+      with:
+        name: test-results-${{ runner.os }}
+        path: build/tests/test-results.xml
+        if-no-files-found: ignore
 
   build-macos:
     runs-on: macos-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Qt
       uses: jurplel/install-qt-action@v4
       with:
         version: '6.11.*'
         cache: 'true'
     - name: Cache Library
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       id: cache-library
       with:
         path: library.bin
@@ -46,7 +67,7 @@ jobs:
         wget https://github.com/leozide/leocad/releases/download/v26.09/Library-26.08.zip -O library.zip
         unzip library.zip
     - name: Cache POV-Ray
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       id: cache-povray
       with:
         path: povray
@@ -66,3 +87,61 @@ jobs:
       run: qmake -early QMAKE_DEFAULT_LIBDIRS=$(xcrun -show-sdk-path)/usr/lib PREFIX=/usr
     - name: Build
       run: make -j ${{ steps.cpu-cores.outputs.count }}
+    - name: Generate test Makefile
+      run: |
+        mkdir -p build/tests
+        cd build/tests
+        qmake ../../tests/tests.pro CONFIG+=release CONFIG-=debug
+    - name: Build tests
+      working-directory: build/tests
+      run: make -j ${{ steps.cpu-cores.outputs.count }}
+    - name: Run tests
+      working-directory: build/tests
+      run: make check TESTARGS="-o test-results.xml,junitxml -o -,txt"
+    - name: Upload test results
+      if: always()
+      uses: actions/upload-artifact@v4
+      with:
+        name: test-results-${{ runner.os }}
+        path: build/tests/test-results.xml
+        if-no-files-found: ignore
+
+  build-windows:
+    runs-on: windows-2022
+    defaults:
+      run:
+        shell: cmd
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up MSVC
+      uses: ilammy/msvc-dev-cmd@v1
+      with:
+        arch: x64
+    - name: Install Qt
+      uses: jurplel/install-qt-action@v4
+      with:
+        version: '6.11.*'
+        arch: 'win64_msvc2022_64'
+        cache: 'true'
+    - name: Generate Makefile
+      run: qmake -spec win32-msvc CONFIG+=release CONFIG-=debug CONFIG-=debug_and_release
+    - name: Build
+      run: nmake /NOLOGO
+    - name: Generate test Makefile
+      run: |
+        mkdir build\tests
+        cd build\tests
+        qmake ..\..\tests\tests.pro -spec win32-msvc CONFIG+=release CONFIG-=debug CONFIG-=debug_and_release
+    - name: Build tests
+      working-directory: build/tests
+      run: nmake /NOLOGO
+    - name: Run tests
+      working-directory: build/tests
+      run: nmake /NOLOGO check "TESTARGS=-o test-results.xml,junitxml -o -,txt"
+    - name: Upload test results
+      if: always()
+      uses: actions/upload-artifact@v4
+      with:
+        name: test-results-${{ runner.os }}
+        path: build/tests/test-results.xml
+        if-no-files-found: ignore