How to Center Text inside an SVG Path

I need some help, when I use svg to draw a cycle and put some text, how to Center Text inside an SVG Path

 <svg height="500"width="500">
       <path d="M250 250 L250 0 A250,250,0,0,1,250,0  L250 250 Z"fill="#fff"stroke="#fff"></path>
       <defs>
          <path id="p0"d="M250 50 A200,200,0,0,1,250,50 Z"fill="#fff"stroke="#fff"></path>
       </defs>
       <text style="font-size: 24px;"x="0"text-anchor="center">
          <textPath xmlns:xlink="http://www.w3.org/1999/xlink"xlink:href="#p0">0test text</textPath>
       </text>
       <path d="M250 250 L250 0 A250,250,0,0,1,466.50635094610965,124.99999999999997  L250 250 Z"fill="#ddd"stroke="#ddd"></path>
       <defs>
          <path id="p1"d="M250 50 A200,200,0,0,1,423.2050807568877,149.99999999999997 Z"fill="#ddd"stroke="#ddd"></path>
       </defs>
       <text style="font-size: 24px;"x="0"text-anchor="center">
          <textPath xmlns:xlink="http://www.w3.org/1999/xlink"xlink:href="#p1">1test text</textPath>
       </text>
       <path d="M250 250 L466.50635094610965 124.99999999999997 A250,250,0,0,1,466.5063509461097,374.99999999999994  L250 250 Z"fill="#fff"stroke="#fff"></path>
       <defs>
          <path id="p2"d="M423.2050807568877 149.99999999999997 A200,200,0,0,1,423.20508075688775,349.99999999999994 Z"fill="#fff"stroke="#fff"></path>
       </defs>
       <text style="font-size: 24px;"x="0"text-anchor="center">
          <textPath xmlns:xlink="http://www.w3.org/1999/xlink"xlink:href="#p2">2test text</textPath>
       </text>
       <path d="M250 250 L466.5063509461097 374.99999999999994 A250,250,0,0,1,250.00000000000003,500  L250 250 Z"fill="#ddd"stroke="#ddd"></path>
       <defs>
          <path id="p3"d="M423.20508075688775 349.99999999999994 A200,200,0,0,1,250.00000000000003,450 Z"fill="#ddd"stroke="#ddd"></path>
       </defs>
       <text style="font-size: 24px;"x="0"text-anchor="center">
          <textPath xmlns:xlink="http://www.w3.org/1999/xlink"xlink:href="#p3">3test text</textPath>
       </text>
       <path d="M250 250 L250.00000000000003 500 A250,250,0,0,1,33.49364905389038,375.0000000000001  L250 250 Z"fill="#fff"stroke="#fff"></path>
       <defs>
          <path id="p4"d="M250.00000000000003 450 A200,200,0,0,1,76.7949192431123,350.0000000000001 Z"fill="#fff"stroke="#fff"></path>
       </defs>
       <text style="font-size: 24px;"x="0"text-anchor="center">
          <textPath xmlns:xlink="http://www.w3.org/1999/xlink"xlink:href="#p4">4test text</textPath>
       </text>
       <path d="M250 250 L33.49364905389038 375.0000000000001 A250,250,0,0,1,33.49364905389024,125.00000000000017  L250 250 Z"fill="#ddd"stroke="#ddd"></path>
       <defs>
          <path id="p5"d="M76.7949192431123 350.0000000000001 A200,200,0,0,1,76.79491924311219,150.0000000000001 Z"fill="#ddd"stroke="#ddd"></path>
       </defs>
       <text style="font-size: 24px;"x="0"text-anchor="center">
          <textPath xmlns:xlink="http://www.w3.org/1999/xlink"xlink:href="#p5">5test text</textPath>
       </text>
       <path d="M250 250 L33.49364905389024 125.00000000000017 A250,250,0,0,1,249.99999999999994,0  L250 250 Z"fill="#fff"stroke="#fff"></path>
       <defs>
          <path id="p6"d="M76.79491924311219 150.0000000000001 A200,200,0,0,1,249.99999999999994,50 Z"fill="#fff"stroke="#fff"></path>
       </defs>
       <text style="font-size: 24px;"x="0"text-anchor="center">
          <textPath xmlns:xlink="http://www.w3.org/1999/xlink"xlink:href="#p6">6test text</textPath>
       </text>
    </svg>

Solution

You are part of the way there, but you have made a few mistakes.

text-anchor="center" is wrong. It should be text-anchor="middle".

In addition, you should add startOffset="50%" to the <textPath> element to specify that the text should be centred on the half-way point of the path.

Finally you need to fix the path itself. You need to remove the Z path command at the end of the path description. You only want the arc, not the return line back to the start of the arc.

<svg height="500"width="500">
 
  <path d="M250 250 L250 0 A250,250,0,0,1,466.50635094610965,124.99999999999997  L250 250 Z" fill="#ddd" stroke="#ddd"></path>
  <defs>
    <path id="p1" d="M250 50 A200,200,0,0,1,423.2050807568877,149.99999999999997" fill="#ddd" stroke="#ddd"></path>
  </defs>
  <text style="font-size: 24px;">
    <textPath xlink:href="#p1" startOffset="50%" text-anchor="middle">1test text</textPath>
  </text>
  
</svg>