Jmeter:使用Beanshell断言测试空JSON值 [英] Jmeter: using a Beanshell Assertion to test a null JSON value

问题描述

SI正在尝试测试可能为null的JSON值.

SI'm trying to test a JSON value that may be = null.

首先，我尝试使用jp @ gc-JSON路径声明.但这似乎不会返回任何内容，也不会在遇到空值时定义变量.

First I tried using jp@gc - JSON Path Assertion. but that doesn't appear to return anything or define the variable if it encounters a null value.

所以我试图让它像这样工作:

So I was trying to get it to work like this:

• 使用jp @ gc-JSON路径提取器尝试将值提取到变量中.
• 使用Beanshell断言测试该变量是否存在或具有空值
• 如果该变量不存在，或者存在并且具有空值，那么我知道JSON值为空.

我以前没有用Jmeter编写任何脚本，所以我可能做错了明显的事情，但这是我在Beanshell断言中尝试过的事情:

I haven't written any scripts with Jmeter before, so I may be doing something obviously wrong, but here is what I've tried in the Beanshell Assertion:

try {
  String myValue = vars.get("myValue");
  log.info("myValue =" + myValue);
}
catch (e) {
  log.info( "caught exception: "+e );
  String myValue = null;
}


if (myValue.length() > 0  && myValue != 0 ){
 Failure = true;
 FailureMessage = "myValue was " + myValue + ".";
}
else{
  Failure = false;
}

对于此测试，null值实际上通过了测试.

For this test, a null value actually passes the test.

我遇到的问题是try/catch块不起作用.相反，我在日志中看到以下消息:

The problem I'm running into is that the try/catch block doesn't work. Instead, I see the following message in the log:

jmeter.assertions.BeanShellAssertion: org.apache.jorphan.util.JMeterException: Error invoking bsh method: eval    Sourced file: inline evaluation of: ``import org.apache.jmeter.util.JMeterUtils; try {   //myValue = JMeterUtils.get . . . '' : Attempt to resolve method: length() on undefined variable or class name: myValue

谁能告诉我我做错了什么，和/或如何使此测试无效的JSON值起作用?

Can anyone tell me what I'm doing wrong and/or how to get this test of a null JSON value to work?

推荐答案

此代码中有很多错误的地方；

There are many wrong things in this code;

1. 该错误消息表明它无法识别myValue.那是因为它是在try-catch块中定义的.要解决此问题，必须在try-catch块之前声明String myValue.但是...
2. 结果是，您根本不需要try-catch块，因为vars不会抛出任何异常，但是

1. The error message says that it does not recognize myValue. That's because it is defined within the try-catch block. To fix, you have to declare String myValue before the try-catch block. But...
2. Turns out, you don't need the try-catch block after all, since vars won't throw any Exception but will return null when the given key does not exist.
3. To check if myValue is not null, use myValue != null.

这是更新的代码:

String myValue = vars.get("myValue");
if(myValue != null){
  log.info("myValue =" + myValue);
  Failure = true;
  FailureMessage = "myValue was " + myValue + ".";
}else{
  //log something here?
  Failure = false;
}

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