| assert_has_terms | Does the input have terms? |
| assert_is_empty_model | Is the input the empty model? |
| assert_is_non_empty_model | Is the input the empty model? |
| has_terms | Does the input have terms? |
| is_empty_model | Is the input the empty model? |
| is_non_empty_model | Is the input the empty model? |