crudely sanity-check instance matrix content

tests/storage/test_model_instantiator.py

@@ -16,6 +16,8 @@ class TestModel:
         instantiated_model = instantiator.instantiate(point)
         assert instantiated_model.nr_states == model.nr_states
         assert not instantiated_model.has_parameters
+        assert "0.4" in str(instantiated_model.transition_matrix[1])
 
         point = {p: 0.5 for p in parameters}
         instantiated_model2 = instantiator.instantiate(point)
+        assert "0.5" in str(instantiated_model2.transition_matrix[1])