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Sunday, February 27, 2011

Data driven web service testing with Apache Jmeter

You will not get enough coverage in your web service testing, if you repeatedly send the same request to the webservice under testing. You must read data from a data source and parameterize each request. If you are dealing with SOAP messages, you should parameterize SOAP message payload.
This post guides you how to do data driven web service testing using Apache Jmeter.

Install Apache Jmeter 2.3.4 or later

Step 1

We are going to invoke a publicly available web service, Temerature Conversion service . The WSDL of this web service can be accessible through http://webservices.daehosting.com/services/TemperatureConversions.wso?WSDL
You can invoke the CelciusToFahrenheit operation of this webservice using SOAPUI and capture the request message. It will be similar to the below.

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:tem="http://webservices.daehosting.com/temperature">
Step 2

Lets create a new JMeter test plan and add a thread group. Then, add SOAP/XML-RPC sampler into the thread group and copy and paste the above SOAP request into the SOAP/XML-RPC data section of the sampler.
Enter the URL of the service as http://webservices.daehosting.com/services/TemperatureConversions.wso (You can capture this from the location attribute of the address element in the WSDL)
Now add a listener to view the result.
Save your test plan. Your test plan will be similar to the below.

Run the test and check the results. You will get the Fahrenheit value of the provided Celsius figure.

Step 3

Now, you can increase the thread count and extend this test into a performance test. However, in that case you will be sending the same request again and again. It will not be a good simulation of a real-world scenario. You should be able to alter the payload (in our example, Celsius value) of the SOAP request with each thread.
In order to do so, you should read Celsius data from a data source. In Jmeter, you can easily read data from a csv file.
Lets create a csv file, temperature.csv and save it in the location where you saved the above JMeter test plan.
Enter a set of values row-by-row in the temperature.csv

Step 4

Next, we will add CSV Data Set Config element which will read data from the csv file.
Right click on Thread Group and select Add --> Config Element ---> CSV Data Set Config
Now you can configure your CSV data source as follows.

Filename: <Give the full path of temperature.csv>
Variable Names: celcius

Keep the other values intact.

Step 5

Now access the SOAP/XML-RPC Data section of the request and replace the hard-coded celcius figure with the variable name we have configured in CSV Data Set Config element (i.e:- ${celcius})
After parameterizing, your SOAP request will be as follows.

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:tem="http://webservices.daehosting.com/temperature">

Increase the thread count corresponding to the row count in your csv file and run the test. You will notice that the Celcius figure will be varied in each request by reading data from CSV data source.

In this way, you can easily do data driven web service testing using Jmeter.