testNG retry 失败的testcase只需要在xml中配置一个listener即可

时间:2022-03-05 11:16:38

问题情况                                                 

先说下问题情况,最近在做testNG与selenium集成做自动化测试的问题。

因为如果将testNG做UI 测试的话,很多情况下可能测试是失败的,但是这些失败可能是一些其他的问题导致的,可能是脚本的问题或者是网络环境不稳定导致的,所以我们需要重新尝试运行这个失败的测试用例。

testNG倒是没有直接的retry testcase的功能,不过它却提供了很多的接口,我们可以实现这些接口来得到retry的效果。

在google上看到淘宝的QA项目组采用Ruby语言将testNG的源代码修改了retry的功能,然后又重新build后这样做的。这是一个solution,但是我不推荐。原因有两个:

1,修改的jar包是针对指定的testNG版本的,所以如果我们需要体验testNG的新版本功能,这个jar可能就需要在源码基本上重新build有点 不太合适,详细地址是:https://github.com/NetEase/Dagger/wiki/Retry-Failed-Or-Skipped-Testcases

2,该种修改的方法只能使用在testcase级别上,如果需要针对所有的testNG的testsuite都是用这种特性,可能就需要每个testcase都表明他们是使用这个retry功能,有点代码亢余。像这样在testcase中声明retry的类:

import org.apache.log4j.Logger;
import org.testng.Assert;
import org.testng.annotations.Test; import com.hp.baserunner.RetryFail;
import com.hp.pop.DemoPage; public class DemoRun { private static Logger log=Logger.getLogger(DemoRun.class);
@Test(retryAnalyzer=RetryFail.class)// 这里声明retry的类,可以看到如果这样每个testcase可能都需要这样做,代码是不是有点多啊 :(
public void demoTest()
{
DemoPage dp=new DemoPage();
dp.demoTest();
}
@Test
public void demoTest2()
{
DemoPage dp2=new DemoPage();
dp2.demoTest2();
}
}
既然是框架这样写肯定就有点不太合适了。
框架设计使用                                         
testNG中的对应的提供这些功能的接口有这些:

Interface IRetryAnalyzer   这个就是retrytestcase的一个接口,然后impletment这个接口后实现相应的方法即可:

有一个类 RetryAnalyzerCount  已经实现了以上的这个接口的方法:

package org.testng.util;

import org.testng.IRetryAnalyzer;
import org.testng.ITestResult; import java.util.concurrent.atomic.AtomicInteger; /**
* An implementation of IRetryAnalyzer that allows you to specify
* the maximum number of times you want your test to be retried.
*
* @author tocman@gmail.com (Jeremie Lenfant-Engelmann)
*/
public abstract class RetryAnalyzerCount implements IRetryAnalyzer { // Default retry once.
AtomicInteger count = new AtomicInteger(1); /**
* Set the max number of time the method needs to be retried.
* @param count
*/
protected void setCount(int count) {
this.count.set(count);
} /**
* Retries the test if count is not 0.
* @param result The result of the test.
*/
@Override
public boolean retry(ITestResult result) {
boolean retry = false; if (count.intValue() > 0) {
retry = retryMethod(result);
count.decrementAndGet();
}
return retry;
} /**
* The method implemented by the class that test if the test
* must be retried or not.
* @param result The result of the test.
* @return true if the test must be retried, false otherwise.
*/
public abstract boolean retryMethod(ITestResult result);
}

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.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
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.csharpcode .lnum { color: #606060; }

 

所以从上面可以看出,如果直接使用继承这个RetryAnalyzerCount 类还是省不少事,直接就可以使用了。

Class TestListenerAdapter

IConfigurationListener, IConfigurationListener2, org.testng.internal.IResultListener, org.testng.internal.IResultListener2, ITestListener, ITestNGListener

上面的是另一个类实现了retry的操作的类。这里不使用。

我们今天所使用的是IRetryAnalyzer 接口的,代码如下:

    package com.com.baserunner;
import org.testng.IRetryAnalyzer;
import org.testng.ITestResult;
/**
* @author sumeetmisri@gmail.com
* @modify alterhu2020@gmail.com
* @version 1.0
* @category
*
*/ public class RetryFail implements IRetryAnalyzer
{
private final int m_maxRetries = 1;
private final int m_sleepBetweenRetries = 1000;
private int currentTry;
private String previousTest = null;
private String currentTest = null;
public RetryFail()
{
currentTry = 0;
} @Override
public boolean retry(final ITestResult result)
{
// If a testcase has succeeded, this function is not called.
boolean retValue = false; // Getting the max retries from suite.
// String maxRetriesStr = result.getTestContext().getCurrentXmlTest().getParameter("maxRetries");
String maxRetriesStr = result.getTestContext().getSuite().getParameter("maxRetries");
int maxRetries = m_maxRetries;
if(maxRetriesStr != null)
{
try
{
maxRetries = Integer.parseInt(maxRetriesStr);
}
catch (final NumberFormatException e)
{
System.out.println("NumberFormatException while parsing maxRetries from suite file." + e);
}
} // Getting the sleep between retries from suite.you can from the suite parameter
String sleepBetweenRetriesStr = result.getTestContext().getSuite().getParameter("sleepBetweenRetries");
int sleepBetweenRetries = m_sleepBetweenRetries;
if(sleepBetweenRetriesStr != null)
{
try
{
sleepBetweenRetries = Integer.parseInt(sleepBetweenRetriesStr);
}
catch (final NumberFormatException e)
{
System.out.println("NumberFormatException while parsing sleepBetweenRetries from suite file." + e);
}
} currentTest = result.getTestContext().getCurrentXmlTest().getName(); if (previousTest == null)
{
previousTest = currentTest;
}
if(!(previousTest.equals(currentTest)))
{
currentTry = 0;
} if (currentTry < maxRetries &&!result.isSuccess())
{
try
{
Thread.sleep(sleepBetweenRetries);
}
catch (final InterruptedException e)
{
e.printStackTrace();
}
currentTry++;
result.setStatus(ITestResult.SUCCESS_PERCENTAGE_FAILURE);
retValue = true; }
else
{
currentTry = 0;
}
previousTest = currentTest;
// if this method returns true, it will rerun the test once again. return retValue;
}
}

.csharpcode, .csharpcode pre
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color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }还有一个lisetner需要加入到testNG的配置文件中:

package com.coma.baserunner;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method; import org.testng.IAnnotationTransformer;
import org.testng.IRetryAnalyzer;
import org.testng.annotations.ITestAnnotation; public class RetryListener implements IAnnotationTransformer { @SuppressWarnings("rawtypes")
@Override
public void transform(ITestAnnotation annotation, Class testClass,
Constructor testConstructor, Method testMethod) { IRetryAnalyzer retry = annotation.getRetryAnalyzer();
if (retry == null) {
//annotation.setRetryAnalyzer(RetryAnalyzer.class);
annotation.setRetryAnalyzer(RetryFail.class);
}
} }

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }然后在testNG的xml的配置文件中如下配置即可:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="FirstSuite" parallel="false" >
<!-- <parameter name="configfile" value="/resources/config.properties"></parameter> -->
<parameter name="excelpath" value="resources/TestData.xls"></parameter>
<listeners>
<listener class-name="com.com.baserunner.RetryListener"></listener>
</listeners>

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{
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color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

 



以上的配置方法没有任何问题,唯一的缺陷是,运行的时候testNG的报告中会将retry的testcase的次数也计算在内,所以可能造成,运行后的testcase数目不准确,关于这个问题网上也有人在讨论,可是一直都没有得到一个好的接解决。

最近觉得仔细看看testNG的源代码,看看能不能修改下对应的testNG的报告。使得结果显示的testcase数据与实际的一致,retry的testcase只计算最后一次运行成功的。

如果有结果,再更新。。。。。。。testNG retry 失败的testcase只需要在xml中配置一个listener即可