Gradle task check if property is defined

Question

I have a gradle task that executes a testng test suite. I want to be able to pass a flag to the task in order to use a special testng xml suite file (or just use the default

Answer 1

From Gradle Documentation:

-P, --project-prop

Sets a project property of the root project, for example -Pmyprop=myvalue

So you should use:

gradle test -Pspecial=true

with a value after the property name