begin{center}
begin{table}[h!]
begin{tabular}{|l|l|l|l|}hline \
Test users  &  Operating system & Browser & Screen resolution\ \ hline
Test user 1 & Win 7 pro & Mozilla firefox & 1680X1050\ hline
Test user 1 & Win 7 pro & Mozilla firefox & 1680X1050\ hline
Test user 1 & Win 7 pro & Mozilla firefox & 1680X1050\ hline
end{tabular}
caption{Test environment details}
label{Test-environment-details}
end{table}
end{center}