ring(matrix, constr, 'matrix');
       assert_class_string(a, getReturnType(method), 'a');
       assert_class_string(b, getReturnType(method), 'b');
       assert_not_equals(a, b, 'a !== b');
       assert_not_equals(a, matrix, 'a !== matrix');
       assert_not_equals(b, matrix, 'b !== matrix');
     }, `${constr} ${method}`);
   });
});
</script>
