Added back the OpenMP tests to check the simd macros.

tests/CMakeLists.txt

@@ -132,3 +132,22 @@ add_executable(
 )
 decorate_executable(cuspar_test)
 target_compile_definitions(cuspar_test PRIVATE CUSTOM_PARALLEL_TEST=1)
+
+find_package(OpenMP)
+if(OpenMP_FOUND)
+    # Testing the OpenMP SIMD macros.
+    create_isometric_unary_test(omp_isometric_unary_test)
+    target_link_libraries(omp_isometric_unary_test OpenMP::OpenMP_CXX)
+
+    create_isometric_binary_test(omp_isometric_binary_test)
+    target_link_libraries(omp_isometric_binary_test OpenMP::OpenMP_CXX)
+
+    add_executable(
+        omp_sparse_test
+        src/sparse/convert_to_compressed_sparse.cpp
+        src/sparse/CompressedSparseMatrix.cpp
+        src/sparse/FragmentedSparseMatrix.cpp
+    )
+    decorate_executable(omp_sparse_test)
+    target_link_libraries(omp_sparse_test OpenMP::OpenMP_CXX)
+endif()