Test structures for electrically detecting BEOL failures are provided. In an embodiment, the structure comprises: an input/output connection disposed above a primary conductive pad which is embedded in an insulator; a dielectric layer disposed upon the insulator; a primary via extending through the dielectric layer down to the primary conductive pad for providing electrical connection between the input/output connection and the primary conductive pad; and a secondary via filled with a conductive material in electrical connection with the input/output connection, the secondary via extending through the dielectric layer down to a secondary interconnect in electrical connection with a secondary conductive pad that is insulated from the primary conductive pad.