Rest API Automation in Java – Post Method

Using Rest-assured and TestNG

In this post, we will be using Rest-Assured library and TestNG to automate the http post method of a Rest-ful API. Rest Assured is a Java library using which we can test and validate the REST web services. Although Rest-assured provides its own validating mechanism(assertions for validating response) but we can combine Rest-assured with TestNG to get the best of both the libraries.

During the course of this tutorial, we will be using the following-

• Sample Rest API to be used in Automation – RestCountries API
• Rest-Assured and its dependencies (https://code.google.com/p/rest-assured/wiki/Downloads) (Remember to download and add to class path, the other dependencies also). POM dependencies for the Rest Assured and its dependencies-

com.jayway.restassured
rest-assured
2.3.4


org.codehaus.groovy
groovy-all
2.3.5

• TestNG as testing framework

Automating Rest API HTTP Post method

The following code snippet uses requestSpecBuilder to create a post request. We have used the following parameters in our code, you need to set them as per your requirement-

• APIUrl – Set APIUrl variable with the URL of the Rest API
• APIBody – Set APIBody variable with body of the Rest API containing parameters e.g. {“key1″:”value1″,”key2″:”value2”}
• setContentType() – Pass the “application/json”, “application/xml” or “text/html” etc. headers to setContenType() method
• Authentication credentials – Pass the username and password to the basic() method and in case of no authentication leave them blank basic(“”,””)

The comments in the following code make it self-explanatory.

@Test

public void httpPost() throws JSONException,InterruptedException {

//Initializing Rest API's URL

String APIUrl = "http://{API URL}";
//Initializing payload or API body

String APIBody = "{API Body}"; //e.g.- "{"key1



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