TestNG testing framework — Parameterization

TestNG

What is Parameterization?

Whenever we define any parameters on any of our methods, it means we are parametrizing that method. e.g. assuming areaOfSquare(int side);takes one argument which is integer and returns ares of square. it also allows you to use the same method for N. no of values.

@Test method of TestNG supports parameterization, which in simple terms means it allows us to pass values to our test method at runtime.

Ways to Parameterize @Test Method

1. @DataProvider
2. @Parameters

Parameterization with @DataProvider annotation

Always remember to use below 2 if you plan on parameterizing your @Test with data provider.

1. @DataProvider annotation with name attribute
2. @Test with attribute dataProvider having same value as specified for above step.

Code:

Example

Output:

testMethod called with [abc, cde]
testMethod called with [efg, hij]
testMethod1 called with [abc, cde]
testMethod1 called with [efg, hij]

Parameterization with @Parameters annotation

Passing value with @Parameters is bit tricky here as we will be passing values from testng.xml

TestNG.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd">
<suite name="Suite">
    <test name="Test1">
        <parameter name="value1" value="abc"></parameter>
        <parameter name="value2" value="cde"></parameter>
        <parameter name="value3" value="klm"></parameter>
        <classes>
            <class name="ParametersDemo" ></class>
        </classes>
    </test> <!-- Test -->
    <test name="Test2">
        <parameter name="value1" value="efg"></parameter>
        <parameter name="value2" value="hij"></parameter>
        <classes>
            <class name="ParametersDemo" ></class>
        </classes>
    </test> <!-- Test -->
</suite> <!-- Suite -->

Script

Output:

testMethod called with [abc,cde,klm]
testMethod called with [efg,hij,default]

As you see above for second test tag we only specified 2 parameters instead of 3 and because of @Optional usage we didn’t get any error.

if you would have not specified @Optional and you didn’t specify parameter in testng.xml you will below error.

testMethod called with [abc,cde,klm]
org.testng.TestNGException: 
Parameter 'value3' is required by @Test on method testMethod but has not been marked @Optional or defined

Useful URLs:

TestNG Parameters — Javatpoint

I’ve covered control annotations here @ TestNG testing framework — Annotations

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