[Tex/LaTex] \part and text on same page in book documentclass

Question

I wonder how to get \part and text on same page with book documentclass. Thanks for any help.

\documentclass{book}
\usepackage[english]{babel} 
\usepackage[T1]{fontenc}     
\usepackage{lipsum}

\begin{document}

\part{Test1}

\lipsum[1-5]

\part{Test2}

\lipsum[2-6]

\end{document}

Answer 1

What you need is the titlesec package.

\documentclass{book}
\usepackage[english]{babel} 
\usepackage[T1]{fontenc}     
\usepackage{lipsum}

\usepackage{titlesec}
\titleclass{\part}{top}
\titleformat{\part}[display]
  {\huge\bfseries\centering}{\partname~\thepart}{0pt}{}
\titlespacing*{\part}{0pt}{40pt}{40pt}

\begin{document}
    \part{Test1}
    \lipsum[1-5]
    \part{Test2}
    \lipsum[2-6]
\end{document}