\ProvidesFile{test.cbx}[ 2016/01/01 v1.0 biblatex citation style ]
\ExecuteBibliographyOptions{labelnumber}
\newbibmacro*{cite}{\printtext{\printfield{labelnumber}}}
\DeclareCiteCommand{\cite}[\mkbibbrackets]
                          {\usebibmacro{prenote}}
                          {\usebibmacro{citeindex}\usebibmacro{cite}}
                          {\multicitedelim}
                          {\usebibmacro{postnote}}
\endinput