Detail Description of JMeter Components

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Response Assertion

In Response Assertion, we can add our own pattern strings and then compare them with the responses received from a server. For example, you all know response code is 200 when any request returns some response successfully. So, if we add pattern string “Response Code = 202” then the test case should fail.

Please refer below screenshots to add Response Code assertion.

Now, when the test runs it shows the result with Red Color indicating that the Assertion results are failed.

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Duration Assertion

Duration Assertion is very important and validates that the server responded within a given amount of time. This can be used in scenarios where we need to sample 100 requests and ensure that every time response is received within the benchmarked limit.

Case: 10 users are concurrently hitting “google.com” server and Duration Assertion is set to 1000ms.Please see below screenshots:

XML Assertion validates if response data has correct XML document in it and HTML Assertion verifies the HTML syntax of the response received from a server.

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Config Elements

Requests sent to the server can be further parameterize using some config elements which are executed before the actual request. A simple example of it could be reading values of a variable from a CSV file for which CSV Data Set Config is used.

Below are some of the important config elements used in the performance testing of the web and mobile applications

• CSV Data Set Config.
• User Defined Variables
• HTTPS Requests Default
• HTTPS Cache Manager
• HTTPS Cookie Manager
  
  

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CSV Data Set Config

CSV data set config helps Jmeter in picking values of some parameters from a CSV file rather than passing different parameter in each separate request. For example, if we need to test login functionality with a different set of users and passwords, then we can create two columns in a CSV file and enter the values there so that JMeter can pick one for each request sent to the server.

Below is the flow of using CSV data set the config to test weather API for different cities in India.

• Adding CSV data set config element to test plan
  
  

• Creating CSV file
• Passing variable in the request parameter. APPID parameter can be generated dynamically from http://openweathermap.org/appid
  
  

• Running the test and viewing results.
  
  

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User Defined Variables

It helps Jmeter to pick values from a pre-defined variable. For example, support that you need to create a test plan in which you need to add many HTTP requests on the same URL and there could be a scenario in which client plans to migrate it later to some different URL.So, to avoid updating URL in each request we can tell JMeter to pick the URL from a UDV (User Defined Variable) which can be later updated to handle all requests to updated URL.

So, to avoid updating URL in each request we can tell JMeter to pick the URL from a UDV (User Defined Variable) which can be later updated to handle all requests to updated URL.

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HTTP Request Defaults

This config element is very useful for specifying the default values of https requests.  To guide you more, take an example where we need to hit 50 different requests at google server.In this scenario, if we add an HTTP Request Default then we need not specify a server name, path or any other properties like port number, connection time out properties. Whatever is specified in the HTTP Request Default config element is inherited by all HTTP requests.

In this scenario, if we add an HTTP Request Default then we need not specify a server name, path or any other properties like port number, connection time out properties. Whatever is specified in the HTTP Request Default config element is inherited by all HTTP requests.

Please see below how to add HTTP Request Default and specify server and path.

HTTP Cache Manager and HTTP Cookie Manager are used in making JMeter behave as a real-time browser. HTTP Cache manager can clear cache after each request whereas the other one can manage the cookies settings.

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Logic Controllers And Timers

Logic controllers and timers help Jmeter control the flow of transactions. Timers ensure the delay in each thread if need to test any server. For Example, if we need FTP request to wait for 5 secs after HTTP request is completed, we can add timer there.

Logic Controllers are used to defining the flow of requests which are sent to the server. It can also let you store requests for each module separately such as login and logout.

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Conclusion

By now, you all must have got yourself familiar with the components of JMeter and have tried using it and must be facing some issues. In the next article, we will be covering some real-time performance testing scenarios covering mobility domain so that you all get more hands-on knowledge on JMeter.

Stay Tuned! Next article will help you managing your requests as well as analyzing results and comparing with the benchmarks of performance testing.

=> Continue reading part-III: JMeter Processors and Controllers

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Source

AlexQin

good job