TestNG 强大的测试框架(6)-接口IRetryAnalyzer，失败用例重复执行

     上一章介绍了ant+testng+xlst，其实到了这里，我们就可以直接搭建在Jenkins服务器上，让它跑起来！但是，我之前部署在Jenkins上的UI自动化用例偶尔会报错，我去查看代码，又没有什么问题，再运行一次，它又正常了，其实这种问题，我相信不止我一个人遇到！

     说到这里，不得不引进TestNg框架的一个接口：IRetryAnalyzer，它有一个方法retry(ITestResult iTestResult)实现对失败的测试用例多次执行，可以有效的排除上面我说的那种情况。那么怎么来把这个方法给用起来呢？TestNg框架里的Annotion(注解)里可以直接指向该类。

一、下面举个简单的列子

    1.IRetryAnalyzer接口的实现，

package com.Retry;


import org.testng.IRetryAnalyzer;
import org.testng.ITestResult;

public class OverrideRetry implements IRetryAnalyzer{
	private int count = 1;
	private int max_retry_count = 3;
	
	/*
	 * OverrideRetry实现接口IRetryAnalyzer的方法，重复执行失败用例
	 * (non-Javadoc)
	 * @see org.testng.IRetryAnalyzer#retry(org.testng.ITestResult)
	 */
	@Override
	public boolean retry(ITestResult iTestResult) {
		System.out.println("执行用例："+iTestResult.getName()+"，第"+count+"次失败");
		if(count<max_retry_count){
			count++;
			return true;
		}
		return false;
	}

}

    2.TestNg测试类

 @Test(retryAnalyzer= OverrideRetry.class)
  public void b(){
	  System.out.println(2/0);
  }

　 3.运行结果

 

二、通过上面的demo，我们实现了对失败的测试用例进行二次执行。但是爱思考的同学就会发现，上面的demo不太适合用到真正的自动化测试里，因为每个@test里都要进行retryAnalyzer配置，重复劳动，太累了。

     下面给大家介绍TestNg另外一个接口IAnnotationTransformer，判断用例是否达到重试的要求。

       1.IRetryAnalyzer接口的实现， 

package com.Retry;

import org.testng.IRetryAnalyzer;
import org.testng.ITestResult;
import org.testng.Reporter;

public class OverrideRetry implements IRetryAnalyzer{
	private int count = 1;         //统计测试用例失败的次数
	private int Max_Fail_Count = 3; //测试用例最大失败次数
	@Override
	public boolean retry(ITestResult iTestResult) {
		String msg = "执行用例："+iTestResult.getName()+"第"+count+"次运行失败";
		System.out.println(iTestResult);
		Reporter.log(msg);
		if(count<Max_Fail_Count){
			count++;
			return true;
		}
		return false;
	}

}

　　2.IAnnotationTransformer接口的实现。

package com.Transformer;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;

import org.testng.IRetryAnalyzer;
import org.testng.annotations.ITestAnnotation;
import org.testng.internal.annotations.IAnnotationTransformer;

import com.Retry.OverrideRetry;

public class OverrideTransformer implements IAnnotationTransformer{

	@SuppressWarnings("rawtypes")
	@Override
	public void transform(ITestAnnotation iTestAnnotation, 
			Class class1, Constructor constructor, Method method) {
		
		IRetryAnalyzer iRetryAnalyzer = iTestAnnotation.getRetryAnalyzer();
		System.out.println("transform(),iRetryAnalyzer:"+iRetryAnalyzer);
		if(iRetryAnalyzer==null){
			iTestAnnotation.setRetryAnalyzer(OverrideRetry.class);
		}
		
	}

}

　　3.testng.xml,里面添加了监听器listener，监听类com.Transformer.OverrideTransformer里的重试函数transform(ITestAnnotation iTestAnnotation, Class class1, Constructor constructor, Method method) ，判断下面的测试用例是否失败，达到重试要求.

<?xml version="1.0" encoding="UTF8"?>
<suite name = "suite">
        <listeners>
                  <listener class-name="com.Transformer.OverrideTransformer"></listener>
        </listeners>

        <test  name="CloudPoint" >
		<parameter name="resp_code" value="200"/>
		<classes name = "Normal">
				<class name="com.TestNg.CloudPoint.CP_Normal_1"/>
				<class name="com.TestNg.CloudPoint.CP_Normal_2"/>
				<class name="com.TestNg.CloudPoint.CP_Exception_androidlost"/>
				<class name="com.TestNg.CloudPoint.CP_Exception_kvlost"/>
		</classes>
       </test>

       <test  name="DDL" >
	       <parameter name="resp_code" value="200"/>
		<classes name = "Normal">
			<class name="com.TestNg.DDL.DDL_Normal_1"/>
		</classes>
	</test>

</suite>

　　4.运行build.xml,标红部分是重试函数对失败用例的运行结果的输出

Buildfile: D:\java\workspaces\GroupApi\build.xml
clean:
   [delete] Deleting directory D:\java\workspaces\GroupApi\bin
compile:
     [echo] mkdir
    [mkdir] Created dir: D:\java\workspaces\GroupApi\bin
    [javac] Compiling 11 source files to D:\java\workspaces\GroupApi\bin
run:
   [testng] [TestNGContentHandler] [WARN] It is strongly recommended to add "<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >" at the top of your file, otherwise TestNG may fail or not work as expected.
   [testng] transform(),iRetryAnalyzer:null
   [testng] transform(),iRetryAnalyzer:null
   [testng] transform(),iRetryAnalyzer:null
   [testng] transform(),iRetryAnalyzer:null
   [testng] transform(),iRetryAnalyzer:null
   [testng] transform(),iRetryAnalyzer:null
   [testng] transform(),iRetryAnalyzer:null
   [testng] transform(),iRetryAnalyzer:null
   [testng] transform(),iRetryAnalyzer:null
   [testng] excel file is D:\java\workspaces\GroupApi\interfacaecase.xlsx
   [testng] log4j:WARN No appenders could be found for logger (org.apache.http.client.protocol.RequestAddCookies).
   [testng] log4j:WARN Please initialize the log4j system properly.
   [testng] log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
   [testng] excel file is D:\java\workspaces\GroupApi\interfacaecase.xlsx
   [testng] excel file is D:\java\workspaces\GroupApi\interfacaecase.xlsx
   [testng] excel file is D:\java\workspaces\GroupApi\interfacaecase.xlsx
   [testng] excel file is D:\java\workspaces\GroupApi\interfacaecase.xlsx
   [testng] excel file is D:\java\workspaces\GroupApi\interfacaecase.xlsx
   [testng] excel file is D:\java\workspaces\GroupApi\interfacaecase.xlsx
   [testng] true
   [testng] excel file is D:\java\workspaces\GroupApi\interfacaecase.xlsx
   [testng] true
   [testng] excelread:{} is String
   [testng] data:{} is String
   [testng] D:\java\workspaces\GroupApi
   [testng] excel file is D:\java\workspaces\GroupApi\interfacaecase.xlsx
   [testng] [TestResult name=StatusCode status=FAILURE method=DDL_Normal_1.StatusCode()[pri:0, instance:com.TestNg.DDL.DDL_Normal_1@50f8360d] output={null}]
   [testng] [TestResult name=StatusCode status=FAILURE method=DDL_Normal_1.StatusCode()[pri:0, instance:com.TestNg.DDL.DDL_Normal_1@50f8360d] output={null}]
   [testng] [TestResult name=StatusCode status=FAILURE method=DDL_Normal_1.StatusCode()[pri:0, instance:com.TestNg.DDL.DDL_Normal_1@50f8360d] output={null}]
   [testng] ===============================================
   [testng] suite
   [testng] Total tests run: 11, Failures: 1, Skips: 2
   [testng] ===============================================
   [testng] The tests failed.
     [xslt] Processing D:\java\workspaces\GroupApi\test-output\testng-results.xml to D:\java\workspaces\GroupApi\test-output\index1.html
     [xslt] Loading stylesheet D:\java\workspaces\GroupApi\test-output\testng-results.xsl
BUILD SUCCESSFUL
Total time: 8 seconds

　　5.测试报告输出