# 4.3.2.Writing first assertion

* 1.Add a new assertion: XPath
  * 1.按下Declare紐, 帶入namespace
  * 2.填入期望值的路徑(XPath Expression)
    * e.g.,
      * 完整的response格式為

        ```
        <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
         <soapenv:Body>
            <ns1:getBankResponse xmlns:ns1="http://thomas-bayer.com/blz/">
               <ns1:details>
                  <ns1:bezeichnung>Postbank (Giro)</ns1:bezeichnung>
                  <ns1:bic>PBNKDEFF200</ns1:bic>
                  <ns1:ort>Hamburg</ns1:ort>
                  <ns1:plz>22280</ns1:plz>
               </ns1:details>
            </ns1:getBankResponse>
         </soapenv:Body>
        </soapenv:Envelope>
        ```
      * 若想要抓bic的值, 應填入的路徑為

        ```
        //ns1:getBankResponse/ns1:details/ns1:bic
        ```
  * 3.下方填入期望值
  * 4.按下Test紐以測試

    ![](https://163116165-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M4M0G7tIs4o9F9vSrao%2F-M4M0IVB0ax0vs2ocz_r%2F-M4M0ZCi4E4E34YnAUi-%2F201803283.jpg?generation=1586302970311611\&alt=media)
* 2.用XPath計算某欄位的個數\
  ![](https://163116165-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M4M0G7tIs4o9F9vSrao%2F-M4M0IVB0ax0vs2ocz_r%2F-M4M0ZCkre4PXK4p43Yo%2F201803284.jpg?generation=1586302970482482\&alt=media)
* 3.用XPath過濾某個欄位的值 ![](https://163116165-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M4M0G7tIs4o9F9vSrao%2F-M4M0IVB0ax0vs2ocz_r%2F-M4M0ZCmizAcoxmDX9Q0%2F201803285.jpg?generation=1586302970314363\&alt=media)