[CI] Ensure unregistered samples are tested

.github/workflows/main.yml

@@ -249,6 +249,9 @@ jobs:
       run: |
         export DYLD_LIBRARY_PATH=build/lib
         python3 -m pytest -raP -v -n auto --durations=50 test/python
+    - name: Build untested samples
+      # Compile samples that are not registered as tests.
+      run: scons samples
     - name: Upload shared library
       uses: actions/upload-artifact@v7
       if: matrix.python-version == '3.12'

test_problems/SConscript

@@ -224,6 +224,10 @@ Test('cxx-custom', 'cxx_samples', '#build/samples/cxx/custom/custom', None,
 Test('cxx-demo', 'cxx_samples', '#build/samples/cxx/demo/demo',
      'cxx_demo_blessed.txt',
      threshold=1e-10, tolerance=2e-4, slow=True)
+# Test is significantly slower than others
+Test('cxx-derivative-speed', 'cxx_samples',
+     '#build/samples/cxx/jacobian/derivative_speed', None,
+     options='--test h2o2', slow=True)
 Test('cxx-flamespeed', 'cxx_samples', '#build/samples/cxx/flamespeed/flamespeed',
      'cxx_flamespeed_blessed.txt',
      comparisons=[('flamespeed_blessed.csv', 'flamespeed.csv')],