长表格单元格调整

Question

我在使用 latex 时遇到了问题longtable。我的问题是我无法longtable正确调整单元格。下面是我的longtable示例：

\usepackage{float}
\usepackage{longtable}
\usepackage{afterpage}
\usepackage{array}
\usepackage{makecell}
\usepackage[bottom]{footmisc}
\usepackage{seqsplit}
\usepackage{verbatim}
\usepackage{url}
\usepackage{minitoc}
\usepackage[title]{appendix}
\usepackage{footmisc}
\renewcommand{\labelenumii}{\theenumii}
\renewcommand{\theenumii}{\theenumi.\arabic{enumii}.}
\renewcommand{\thefigure}{\arabic{figure}}
\newcommand\tab[1][1.25cm]{\hspace*{#1}}

\usepackage{chngcntr}

\counterwithout{figure}{chapter}
\counterwithout{table}{chapter}

\usepackage{titletoc}% http://ctan.org/pkg/titletoc
\titlecontents*{chapter}% <section-type>
  [0pt]% <left>
  {}% <above-code>
  {\bfseries\chaptername\ \thecontentslabel\quad}% <numbered-entry-format>
  {}% <numberless-entry-format>
  {\bfseries\hfill\contentspage}% <filler-page-format>

 \let\origaddvspace\addvspace
 \renewcommand{\addvspace}[1]{}

\addto{\captionsfrench}{% Making babel aware of special titles
  \renewcommand{\mtctitle}{Plan}
}


\pagenumbering{arabic}
\setcounter{page}{1}
\newpage
\begin{longtable}{|p{0.05\linewidth}|p{0.1\linewidth}|p{0.25\linewidth}|p{0.45\linewidth}|}
  \hline 
 \centering &\centering Test & \centering  Description & \centering  Service
   \tabularnewline
 \endhead
  \hline
  1&testFoundingAllCertificateWithPrivateKey & &CertificateService.extractAllCertificates() \\
  \hline
  2& testRetrieveCertificateWithNonInitializedKeyStore & & CertificateService.extractAllCertificates()\\
  \hline
    3& & &CertificateService.signDataCMS() \\
  \hline
    4& & &CertificateService.signDataCMS() \\
  \hline
    5& & &CertificateService.signDataCMS() \\
  \hline
    6& & &CertificateService.signDataCMS() \\
  \hline
    7& & &CertificateService.signDataCMS() \\
  \hline
  \caption{Les tests unitaires}
  \end{longtable} 

\end{document} 

输出如下：

有没有什么方法可以自动调整文本？