Test: Add CTest labels to enable test filtering

doc/superbuild/source/developers/testing/CTest.rst

@@ -179,3 +179,59 @@ sanitizers. These can be enabled with the following CMake options.
    ``-fsanitize=undefined`` flag.
 
    Default: OFF
+
+Labels
+------
+
+The following labels are associated with examples and tests.
+To run a subset of these examples and tests,
+follow `CTest instructions <https://cmake.org/cmake/help/latest/manual/ctest.1.html#label-matching>`__.
+
+Package labels
+^^^^^^^^^^^^^^
+
+========  ========================================
+Labels    Coverage
+========  ========================================
+arkode    ARKODE package
+========  ========================================
+
+Module labels
+^^^^^^^^^^^^^
+
+================  ========================================
+Labels            Coverage
+================  ========================================
+linsol            Linear solver
+linsol_klu        Linear solver with KLU backend
+logging           Logging
+matrix            Matrix
+matrix_sparse     Sparse matrix
+nvector           NVector
+================  ========================================
+
+Method labels
+^^^^^^^^^^^^^
+
+========  ========================================
+Labels    Coverage
+========  ========================================
+dirk      Diagonally implicit Runge-Kutta methods
+========  ========================================
+
+Parallelism labels
+^^^^^^^^^^^^^^^^^^
+================  ========================================
+Labels            Coverage
+================  ========================================
+nvector_serial    NVector with serial backend
+================  ========================================
+
+Language labels
+^^^^^^^^^^^^^^^
+
+========  ========================================
+Labels    Coverage
+========  ========================================
+c         C language
+========  ========================================

examples/arkode/C_klu/CMakeLists.txt

@@ -55,7 +55,9 @@ foreach(example_tuple ${examples_list})
     TEST_ARGS ${example_args}
     ANSWER_DIR ${CMAKE_CURRENT_SOURCE_DIR}
     ANSWER_FILE ${test_name}.out
-    EXAMPLE_TYPE ${example_type})
+    EXAMPLE_TYPE ${example_type}
+    LABELS c arkode nvector nvector_serial linsol linsol_klu matrix
+      matrix_sparse dirk)
 
 endforeach()