begin{tikzpicture}
begin{axis}
    [
    ,width=13cm
    ,xlabel=Test
    ,ylabel=test
    ,xtick=data,
    %,ytick={0,1,...,5}
    ,yticklabels={f1,f2,f3,f4,f5}
    ]
    ytick={1,2,3,4,5},
    xmin=0, xmax=5,
    ymin=0, ymax=5,
    addplot+[sharp plot] coordinates
    {(1,1) (2,2) (3,3) (4,4) (5,5)};
end{axis}
end{tikzpicture}