Multiple test configurations with TestNG
I use TestNG for automated testing as it has a number of
features that JUnit doesn’t have. One of its strengths is the power and
flexibility of configuring tests and supplying parameters to them, for
which there are two methods:
One mechanism is to allow test writers to specify parameters in two files which are merged by Ant into a single testng.xml file before running the tests:
You can invoke the script from Ant with:
- Using the testng.xml file to define both the list of tests to run and parameters.
- Using data providers within your test code to load parameters.
One mechanism is to allow test writers to specify parameters in two files which are merged by Ant into a single testng.xml file before running the tests:
- A testng-default.xml file with the list of tests and default parameters.
- A .properties to supply overrides or additional parameters.
println "Merging testng-default.xml with .properties file into testng.xml"
if (args.size() != 3) {
println "Script requires three arguments:"
println "Path to testng template file"
println "Path to .properties file"
println "Path for saving merged testng file"
}
String testNGTemplate = args[0]
String propertiesFile = args[1]
String mergedTestNGFile = args[2]
// get the properties
File propsFile = new File(propertiesFile)
FileInputStream input = new FileInputStream(propsFile)
Properties props = new Properties()
props.load(input)
// Start copying the testng file
File oldTestNG = new File(testNGTemplate)
File newTestNG = new File(mergedTestNGFile)
// Get the set of parameters. Read in using Groovy XML parser.
Node xml = new XmlParser().parse(oldTestNG)
NodeList parameterList = xml.test.parameters.parameter
// iterate over parameter list and replace any that have been overridden
parameterList.each{p ->
println p.@name
if (props.keySet().contains(p.@name)) {
println "Replacing ${p.@name} with value from .properties file"
// update the value to the one set in .properties
p.@value = props.get(p.@name)
}
}
// Now add any properties that weren't listed in the original
// testng-default.xml file
Set<String> parameterNames = xml.test.parameters.parameter.@name
Node parameters = xml.test.parameters.getAt(0)
props.each{ key, value ->
if (!parameterNames.contains(key)) {
println "Adding property from .properties. Key: ${key}, value: ${value}"
parameters.appendNode("parameter",[name: "${key}", value: "${value}"])
}
}
// Write out the file
new XmlNodePrinter(new PrintWriter(newTestNG)).print(xml)
Note that this script is written assuming that all of your test
classes are part of a single “test”, with the parameters inside that
test, like the following:<suite name="regression-tests">
<test name="regression-basic">
<parameters>
<parameter name="param1" value="value1"/>
<parameter name="param2" value="value2"/>
<parameter name="param3" value="value3"/>
</parameters>
<classes>
<class name="uk.co.somecorp.Test1" />
<class name="uk.co.somecorp.Test2" />
<class name="uk.co.somecorp.Test3" />
</classes>
</test>
</suite>
This is reflected in the lines in the Groovy script that navigate to the parameters, such as:NodeList parameterList = xml.test.parameters.parameterObviously if you want to organise your default testng file differently you’ll need to adjust these parts of the script.
You can invoke the script from Ant with:
<taskdef name="groovy" classname="org.codehaus.groovy.ant.Groovy"> <classpath> <fileset file="/path_to_groovy/groovy-all.jar"/> </classpath> </taskdef> <!-- Target to merge the testng-default.xml and .properties files --> <target name="merge-files"> <groovy src="/path_to_script/MergeTestNGAndProperties.groovy"> <arg value="/some_path/testng-default.xml"/> <arg value="/some_path/my.properties"/> <arg value="/output_path/testng.xml"/> </groovy> </target>
Resoure:
