Added test evals.

Author: Johannes Markert

test/test_forestwrapper.jl

@@ -9,21 +9,29 @@
         @test status == 0
     end
 
+    @test length(T8code.T8CODE_OBJECT_TRACKER) == 0
+
     # Create a forest and wrap by `ForestWrapper`
     scheme = t8_scheme_new_default_cxx()
     cmesh = t8_cmesh_new_hypercube(T8_ECLASS_QUAD, comm, 0, 0, 0)
     forest = t8_forest_new_uniform(cmesh, scheme, 0, 0, comm)
     wrapper_A = T8code.ForestWrapper(forest)
 
+    @test length(T8code.T8CODE_OBJECT_TRACKER) == 1
+
     # Create another forest and wrap by `ForestWrapper`
     scheme = t8_scheme_new_default_cxx()
     cmesh = t8_cmesh_new_hypercube(T8_ECLASS_TRIANGLE, comm, 0, 0, 0)
     forest = t8_forest_new_uniform(cmesh, scheme, 0, 0, comm)
     wrapper_B = T8code.ForestWrapper(forest)
 
+    @test length(T8code.T8CODE_OBJECT_TRACKER) == 2
+
     # Finalize the first wrapper.
     finalize(wrapper_A)
 
+    @test length(T8code.T8CODE_OBJECT_TRACKER) == 1
+
     # The second wrapper should be finalized automatically when Julia shuts down.
     # ... finalize(wrapper_B) ...
 end