How make colored headrow in a table?

Question

I have the following table
newcommand{headrow}{rowcolor{black!20}}
definecolor{Gray}{gray}{0.90}
begin{table}[ht]rowcolors{1}{Gray}{white}
begin{center}
caption{Test Table}
 begin{tabular}{l|cccccccc}
hline
headrow
multirow{2}{1.7cm}{textbf{Approach}}& multicolumn{8}{c}{centering textbf{Test}}
cline{2-9} 
& multicolumn{1}{c}{textbf{A}} & multicolumn{1}{c}{textbf{B}}& multicolumn{1}{c}{textbf{C}} & multicolumn{1}{c}{textbf{D}}& multicolumn{1}{c}{textbf{E}} & multicolumn{1}{c}{textbf{F}}
& multicolumn{1}{c}{textbf{G}}& multicolumn{1}{c}{textbf{H}}
    hline

App1 & &&  && &&&
     
  App2 && &&& &&&
     
   hline
    end{tabular}
   
 end{center}
end{table}

Th output is the following

So as you notice, the header row has two gray colors , one  form headrow and one from my definition of the gray color.
So, how I can have for the header the same color as one from headrow and make the word Approch visible?
Note that, when using the nicematrix, I get the following error

F. Pantigny · Accepted Answer

With {NiceTabular} of nicematrix, you will have a result almost perfect in the PDF viewer (for instance, you won't see the thin white lines you see in the viewers using MuPDF such as SumatraPDF).
However, you need several compilations.
documentclass{article}
usepackage{nicematrix}

begin{document}
definecolor{Gray}{gray}{0.90}
begin{table}[ht]
caption{Test Table}
begin{NiceTabular}{l|cccccccc}%
  [code-before = rowcolors{3}{}{Gray} rowcolor{black!20}{1,2}]
hline
Block{2-1}{textbf{Approach}} & multicolumn{8}{c}{textbf{Test}}
cline{2-9} 
& textbf{A} & textbf{B} & textbf{C} & textbf{D} & textbf{E} & textbf{F}
& textbf{G} & textbf{H} 
hline
App1 
App2 
hline
end{NiceTabular}
end{table}
end{document}

Bernard · Answer

A simple solution consists in adding multirow{-2} at the beginning of the follwing line and adding  cellcolor{black!20} inside the multiro. Unrelated: I added the caption package to have a decant spacing between caption and table. I also removed all the unnecessary multicolumn{1}{c}{…} in the headings row. Last remark: don't use the center within a table: it adds unwanted vertical spacing to the normal spacing of the table environment. environment.
documentclass{article}
usepackage{multirow, caption}
usepackage[table]{xcolor}
newcommand{headrow}{rowcolor{black!20}}

begin{document}

definecolor{Gray}{gray}{0.90}
begin{table}[ht]rowcolors{3}{}{Gray}
setlength{extrarowheight}{2pt}
centering
caption{Test Table}
 begin{tabular}{l|*{8}{c}}
hline
headrow & multicolumn{8}{c}{centering textbf{Test}}
cline{2-9}
headrow multirow{-2}{1.7cm}{textbf{Approach}} & textbf{A} & textbf{B}& textbf{C} & textbf{D}& textbf{E} & textbf{F}
& textbf{G}& textbf{H}
    hline

App1 & && && &&&
    
  App2 && &&& &&&
    
   hline
    end{tabular}
end{table}
end{document}

How make colored headrow in a table?

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